Texas Instruments S251B Tiris Reader System User Manual

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1April ’00 PrefaceSeries 2000 Reader SystemReader S251B RI-STU-251BReference Guide11-06-21-054 April 2000FCC ID: A92S251B

PREFACE3Read This FirstAbout This GuideThis manual describes the TIRIS S251B Reader, its goal is to describe the reader,how it works, how to install it and how to use it. Regulatory, safety and warranty notices that must be followed are given inChapter 5. ConventionsIf You Need AssistanceApplication Centers are located in Europe, North and South America, the Far Eastand Australia to provide direct support. For more information, please contact yournearest TIRIS Sales and Application Center. The contact addresses can be found onour home page: http://www.tiris.comWARNING:A WARNING IS USED WHERE CARE MUST BE TAKEN, OR A CERTAINPROCEDURE MUST BE FOLLOWED IN ORDER TO PREVENT INJURYOR HARM TO YOUR HEALTH.CAUTION:This indicates information on conditions which must be met, or a procedure which must be followed, which if not heeded could cause permanent damage to the equipment or software.Note:Indicates conditions which must be met, or procedures which must be followed, to ensure proper functioning of the equipment or software.Information:Indicates information which makes usage of the equipment or soft-ware easier

4S2510 Reader - Reference Guide April ’00Document OverviewPageChapter 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61.1 General............................................................................................... 71.2 System Description ............................................................................ 71.3 Product Description ............................................................................ 7Chapter 2: Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92.1 General............................................................................................. 102.2 Product Description .......................................................................... 102.3 Mechanical Information .................................................................... 22Chapter 3: Synchronization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233.1 Introduction....................................................................................... 243.2 Types of Synchronization ................................................................. 24Chapter 4: Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294.1 Introduction....................................................................................... 304.2 General............................................................................................. 304.3 Mechanical Mounting ....................................................................... 304.4 Communication ................................................................................ 314.5 Synchronization................................................................................ 344.6 General Purpose Input/Outputs........................................................ 384.7 LED Outputs..................................................................................... 394.8 Reset ................................................................................................ 394.9 Antenna ............................................................................................ 404.10 RF Power Output Adjustment........................................................... 40Chapter 5: Warnings, Cautions and Notices . . . . . . . . . . . . . . . . . . . . . . . . . . 41List of FiguresPageFigure 1: S251B Reader ................................................................................ 7Figure 2: S251B Front Panel (with connector covers removed) .................. 10Figure 3: S251B Connector Locations ......................................................... 11Figure 4: CTL Setup Switches ..................................................................... 20Figure 5: RS422/RS485/DAT Switches ....................................................... 21Figure 6: Synchronization DIP Switches...................................................... 21Figure 7: Distance between Antennas (top view)......................................... 28Figure 8: Switch Settings for RS422 ............................................................ 33Figure 9: Switch Settings for RS485 ............................................................ 33Figure 10: Wired & Combined Wireless/Wired Sync. Interface Connection 34Figure 11: Master/Slave Sync. Interface Connection (without Ack.) ............ 35Figure 12: Master/Slave Synchronization Interface Connection .................. 36Figure 13: Carrier Phase Synchronisation Interface Connection ................. 37Figure 14: Connecting the LED Outputs ...................................................... 39Figure 15: RESET Push-button Wiring ........................................................ 39

5April ’00 PrefaceList of TablesPageTable 1: List of Connectors .......................................................................... 11Table 2: Power Range Settings ................................................................... 12Table 3: Supply Connector........................................................................... 12Table 4: Supply Connector - Specifications ................................................. 13Table 5: General Purpose Inputs/Outputs.................................................... 13Table 6: General Purpose Inputs/Outputs - Specifications .......................... 14Table 7: Synchronization Interface............................................................... 14Table 8: Synchronization Interface - Specifications ..................................... 14Table 9: Carrier Phase Synchronization Interface ....................................... 15Table 10: CPS Interface - Specifications ..................................................... 15Table 11: Open Collector & I/Os .................................................................. 16Table 12: Open Collector & I/Os - Specifications......................................... 16Table 13: RS232 SUB-D Connector ............................................................ 17Table 14: RS232 WECO Connector ............................................................ 17Table 15: RS422/RS485 Connector............................................................. 18Table 16: RS422/RS485 Communications Interface - Specifications .......... 18Table 17: Indicator Outputs.......................................................................... 19Table 18: Indicator Outputs - Specifications ................................................ 19Table 19: Antenna........................................................................................ 19Table 20: Antenna - Specifications .............................................................. 19Table 21: CTL Setup DIP Switches.............................................................. 20Table 22: I/O Setting Switches (6 & 7) ......................................................... 20Table 23: RS422/RS485/DAT Settings DIP Switches.................................. 21Table 24: Synchronization DIP Switches ..................................................... 21Table 25: Indicators...................................................................................... 22Table 26: Mechanical Information ................................................................ 22Table 27: Distances Between Antennas ...................................................... 28Table 28: RS232 9-pin Connector................................................................ 31Table 29: RS232 WECO Connector ............................................................ 32Table 30: RS422/RS485 Connector............................................................. 33Table 31: Wired and Combined Wireless/Wired Synchronization................ 34Table 32: Master/Slave Synchronization Without Acknowledgement .......... 35Table 33: Triggered Synchronization ........................................................... 35Table 34: Master/Slave Synchronization With Acknowledgement ............... 36Table 35: General Purpose Inputs/Outputs.................................................. 38Table 36: Antenna Specifications................................................................. 40

CHAPTER 16IntroductionChapter 1: IntroductionThis introduces you to the S251B Reader, what it is and what it does. Topic Page1.1 General..........................................................................................................71.2 System Description......................................................................................71.3 Product Description.....................................................................................71.3.1 Interfaces ...............................................................................................81.3.2 Communications Protocols ....................................................................8

7April ’00 Chapter 1. Introduction1.1 General This document provides information about the S251B Reader. It describes the readerand how to install it. 1.2 System DescriptionA TIRIS system comprises a reader connected to a control device (usually a hostcomputer) via an RS232, or an RS422/RS485 interface, an antenna and a trans-ponder. It is used for wireless identification of TIRIS LF transponders. The reader sends a 134.2 kHz power pulse to a transponder, the energy of the gen-erated magnetic field is stored in the capacitor in the transponder and when the pow-er pulse has finished the transponder immediately sends its data back to the reader. 1.3 Product DescriptionThe Reader is an integral part of a TIRIS system, it provides all of the RF and controlfunctions required to communicate with TIRIS LF transponders. The main task of the Reader is to send a power pulse via the antenna to initialize thetransponder, to demodulate the received identification signal and then send the datato a control device. It is also used to send programming data to Read/Write and Mul-tipage transponders. The Reader is housed in an IP20 Polycarbonate box as shown Figure 1. Figure 1: S251B ReaderIf connected via an RS232 or an RS422/RS485 interface the computer sends com-mands to the reader using one of the two protocols used by the system (ASCII or TI-RIS Bus Protocol), and the reader then communicates via its antenna with anytransponders within that antenna’s range. The antenna can be mounted up to 5 m(depending on the antenna) away from the reader.

8S2510 Reader - Reference Guide April ’001.3.1 InterfacesThe reader has the following connections/interfaces: • Communications interface: RS232, RS422 or RS485 (F & G)• 8 general purpose I/O lines (B)• 2 Open Collector outputs (E)• Synchronization bus (C)• Carrier Phase Synchronization bus (D)• Power connector (A)• Indicator outputs connector (H)• Antenna connector (I)1.3.2 Communications ProtocolsThere are two protocols that can be used with the S251B Reader, they are: ASCII Protocol. This is a simple protocol that you can use to send ASCII charac-ter commands to the reader. It is possible to use a standard termi-nal emulator program to send ASCII commands. The ASCIIprotocol can only be used with RS232 or RS422. TIRIS Bus Protocol. This is a binary protocol suitable for communication be-tween a controlling device (for example: a PC) and one or morereaders. For example with a single reader using an RS232 inter-face or up to 31 readers using RS422/485. The TIRIS Bus protocolcan be used with RS232 or RS422/485. If you are using one reader per controlling device you may choose the protocol thatbest suits your requirements. However, if you have more than one reader connectedto a bus running under a controlling device then you must use the TIRIS Bus Proto-col. For details regarding these communications protocols, please refer to the relevantmanual (11-06-21-037 for the ASCII Protocol, 11-06-21-053 for the TBP), availableat the TIRIS home page: http://www.tiris.com

CHAPTER 29HardwareChapter 2:HardwareThis chapter describes the hardware of the S251B Reader. It tells you which modulestogether comprise the reader. It also describes the front panel (switches connectionsetc.) and specifies the electrical inputs and outputs. Topic Page2.1 General........................................................................................................102.2 Product Description...................................................................................102.2.1 Connectors...........................................................................................112.2.1.1 A - Supply Connector..................................................................122.2.1.2 B - General Purpose Inputs/Outputs...........................................132.2.1.3 C - Synchronization Interface .....................................................142.2.1.4 D - Carrier Phase Synchronization Interface ..............................152.2.1.5 E - Open Collector & I/Os ...........................................................162.2.1.6 F1 & F2 - RS232 Communication Interface................................172.2.1.7 G - RS422/RS485 Communications Interface............................182.2.1.8 H - Indicator Outputs...................................................................192.2.1.9 I - Antenna Connector.................................................................192.2.2 Switches...............................................................................................202.2.3 Indicators..............................................................................................222.2.4 Potentiometers.....................................................................................222.2.4.1 RF Power Adjustment.................................................................222.2.4.2 EMI / Sync. Level Adjustment.....................................................222.3 Mechanical Information.............................................................................22

10S2510 Reader - Reference Guide April ’002.1 GeneralThis chapter describes the hardware comprising the S251B Reader and provides theelectrical specifications. 2.2 Product DescriptionThe S251B Reader is contained in a IP20 polycarbonate box that enables easy inte-gration into standard racks and cabinets. The reader is shown in Figure 1 and the front panel is shown in Figure 2. Figure 2: S251B Front Panel (with connector covers removed)The reader comprises two modules assembled together in a housing. The modulesare: Control Module which contains all the circuitry required to communicate via theinterface to the computer and external devices, to provide syn-chronization, and to control the RFM. It includes a Dynamic AutoTuning (DAT) function to automatically tune the antenna to reso-nance. Radio Frequency Module (RFM) which contains all the analog functions of a TI-RIS reading unit that are needed to initialize a TIRIS transponderand to detect its return signal.

11April ’00 Chapter 2. Hardware2.2.1 ConnectorsThere are 10 connectors on the S251B, 7 WECO connectors, the antenna connector,a 9-pin sub-D RS232 connector, a 6-pin connector for the indicator outputs and a 2-pin connector for the antenna. The function of each pin on each connector (exceptthe RS232 sub-D connector) is described in the following paragraphs. Their locationis shown in Figure 3. Figure 3: S251B Connector LocationsIn order to gain access to the fuse and connector J you must first remove the uppertwo screws holding the front panel on, remove the plastic cover strip and then replacethe two screws. To gain access to the connectors H and I you must first remove thelower two screws holding the front panel on, remove the plastic cover strip and thenreplace the two screws. The pins are not individually numbered on the connectors themselves (just on Figure3 for your convenience). The connectors are all marked on Figure 3 with a letter (from A to I) and are listed inTable 1 which also shows the section that describes them Table 1: List of ConnectorsIdentifying Letter Function SectionA Supply Connector 2.2.1.1B General Purpose Inputs/Outputs 2.2.1.2C Synchronization Interface 2.2.1.3DCarrier Phase Synchronization Interface 2.2.1.4E Open Collector Inputs/Outputs 2.2.1.5F1 RS232 Connector (9-pin SEB-D) 2.2.1.6General Purpose Input / OutputAntenna Power Fuse Synchronization+ -RS422 / 485RS232CTL SetupO.C. - I/ORead O.K.TX ActiveEMIAntenna TuningO.K.L !RS422RS485DATL "RF Power Output Adj.EMI / Sync. Level Adj.OnReader S251BPower Range Setting12A115B16C16D16G16F216EF1 H12I1 11OnOn OnJ123

12S2510 Reader - Reference Guide April ’002.2.1.1 A - Supply ConnectorThe Reader requires a single DC supply voltage (10 to 24 V) through a 2-pin connec-tor marked with + for positive and – for negative The Power Range Setting wired jumpers (marked J in Figure 3) and the actual powersupply have a direct consequence on the operating temperature of the reader asshown in Table 2. 1..F2 RS232 Connector 2.2.1.6G RS422/RS485 Connector 2.2.1.7H Indicator Outputs 2.2.1.8I Antenna Connector 2.2.1.9 Table 2: Power Range SettingsSetting Input Power Operating Temperature RangePins 1 + 2 connected 10 - 15 V -20º to +70º C“ 15 - 24 V -20º to +70º C(max. I_VSP = 0.9 Apeak see caution 1). Pins 2 + 3 connected 18 - 24 V -20º to +70º CCAUTION:1. In order to operate the reader over the full temperature range with pins 1 + 2 connected (15 to 24 V), the maximum current consumption must not exceed 0.9 Apeak. Exceeding this value could result in unreliable functioning of the dynamic auto tuning, or sharp limitation of the transmitter output power because of internal protection. If either of these should occur, switch the device off and allow it time to recover; and then when it is switched on again it will revert to normal oper-ation. Note that if either of these occur it is an indication that the reader is not being operated within its specifications. 2. The reader itself generates heat, therefore if it is incorporated into a housing you must ensure (by proper design and/or cooling) that the temperature immediately surrounding the reader does not exceed the operating temperature range. Table 3: Supply ConnectorPin Signal Description Direction1 + Positive supply input2 - Ground input Table 1: List of ConnectorsIdentifying Letter Function Section

13April ’00 Chapter 2. Hardware2.2.1.2 B - General Purpose Inputs/Outputs The Reader has eight general purpose TTL-Level Inputs/Outputs. By means of theconfiguration set-up, they can be set in groups of four to be Input or Output. Further-more, there is a reset connection and a 5 V regulated output. The pin assignment is given in Table 5 and their specifications are given in Table 6. Table 4: Supply Connector - SpecificationsParameter Minimum MaximumLogic Supply Voltage VSL 10 V 24 VLogic Supply current ISL - 2.5 A Table 5: General Purpose Inputs/OutputsPin Signal Description Direction1 GP IO 7 General Purpose I/O 7 Input/Output2 GP IO 6 General Purpose I/O 6 Input/Output3 GP IO 5 General Purpose I/O 5 Input/Output4 GP IO 4 General Purpose I/O 4 Input/Output5 GP IO 3 General Purpose I/O 3 Input/Output6 GP IO 2 General Purpose I/O 2 Input/Output7 GP IO 1 General Purpose I/O 1 Input/Output8 GP IO 0 General Purpose I/O 0 Input/Output9 - not connected -10 IN1 Input 1 Input11 IN0 Input 0 Input12 RESET- Reset Input13 VCC Regulated 5 Volt dc Supply (see note) Output14 GND Signal Ground -15 GND Signal Ground -CAUTION:Do not connect any power supply to pin 13 as it would damage the reader. The total consumption of the two VCC outputs (General Purpose Inputs/Outputs pin 13 together with Open Collec-tor & I/Os - pin 1) must not exceed 500 mA.

14S2510 Reader - Reference Guide April ’002.2.1.3 C - Synchronization Interface The synchronization interface is used to establish hard wired synchronization withother readers through a single or double pair of wires. Its pin assignment is given inTable 7 and its specifications are given in Table 8. Table 6: General Purpose Inputs/Outputs - SpecificationsParameter Minimum MaximumGP IO Output Voltage @ 6 mALow levelHigh level -3.15 V 0.9 V5.25 VGeneral Purpose IO Output CurrentLow levelHigh level -- 25 mA16 mAGP IO 1 to 4 total Output Current 10 mAGP IO 5 to 8 total Output Current 10 mARegulated 5 V Output Current 100 mA Table 7: Synchronization InterfacePin Signal Description Direction1 Sync Rx+ RS422/RS485 non-inverted synchronization data Input2 Sync Rx- RS422/RS485 inverted synchronization data Input3 GND Signal ground -4 Sync Tx+ RS422/RS485 non-inverted synchronization data Output5 Sync Tx- RS422/RS485 inverted synchronization data Output6 GND Signal ground - Table 8: Synchronization Interface - SpecificationsParameter SpecificationMode of Operation DifferentialNumber of Drivers On Line 32 Number of Receivers On Line 32 Maximum Cable Length 1200 mMaximum Data Rate 10 Mbits/sMaximum Common Mode Voltage +12 V / -7 VDriver Voltage High > +1.5 VLow < -1.5 VDriver Load 60 mADriver Output Short Circuit Limit 150mA to GND250mA to VCC

15April ’00 Chapter 2. Hardware2.2.1.4 D - Carrier Phase Synchronization Interface The carrier phase synchronization interface is used to establish hard wired carrierphase synchronization with other readers through a single pair of wires. Its pin as-signment is given in Table 9 and its specifications are given in Table 10. Receiver Input 12 kΩReceiver Sensitivity ±200 mVReceiver Hysteresis 60 mV Table 9: Carrier Phase Synchronization InterfacePin Signal Description Direction1 Sync Rx+ RS422/RS485 non-inverted synchronization data Input2 Sync Rx- RS422/RS485 inverted synchronization data Input3 GND Signal ground -4 Sync Tx+ RS422/RS485 non-inverted synchronization data Output5 Sync Tx- RS422/RS485 inverted synchronization data Output6 GND Signal ground - Table 10: CPS Interface - SpecificationsParameter SpecificationMode of Operation DifferentialNumber of Drivers On Line 32 Number of Receivers On Line 32 Maximum Cable Length 1200 mMaximum Data Rate 10 Mbits/sMaximum Common Mode Voltage +12 V / -7 VDriver Voltage High > +1.5 VLow < -1.5 VDriver Load 60 mADriver Output Short Circuit Limit 150mA to GND250mA to VCCReceiver Input 12 kΩReceiver Sensitivity ±200 mVReceiver Hysteresis 60 mV Table 8: Synchronization Interface - SpecificationsParameter Specification

16S2510 Reader - Reference Guide April ’002.2.1.5 E - Open Collector & I/Os This connector provide two open collector connections to and from the reader, plusthe RXSS output (used to set the local noise level), another 5 V regulated output andan interrupt input. Its pin assignment is given in Table 11 and its specifications aregiven in Table 12. Table 11: Open Collector & I/OsPin Signal Description Direction1 VCC Regulated 5 Volt dc Supply (see note 1 below) Output2 OC1 Open collector 1 Output3 OC0 Open collector 0 Output4 GND Signal ground -5 INT0 Interrupt 0 (see note 2 below:) Input6 RXSS- RXSS OutputNotes:1. The total consumption of the two VCC outputs (Open Collector & I/Os - pin 1 together with General Purpose Inputs/Outputs pin 13) must not exceed 500 mA. 2. This function is not used or supported by TIRIS standard firmware. It can however be used, if required, by customers who are provid-ing their own software. Table 12: Open Collector & I/Os - SpecificationsParameter Minimum MaximumOpen Collector Voltage to GND 1.3 V 80 VOpen Collector Current 500 mARegulated 5 V Output 4.75 V 5.25 VInterrupt Input 4.75 V 5.25 VRXSS - 5.25 V

17April ’00 Chapter 2. Hardware2.2.1.6 F1 & F2 - RS232 Communication Interface Depending on the DIP-Switch configuration, the Reader will either communicate viathe RS232, RS422 or RS485 interface. There are two interface connectors either of which can be used for an RS232C con-nection. They are: a standard RS232 Interface 9-pin SUB-D male connector (F1 onFigure 3) and a 6-pin WECO connector (F2 on Figure 3). Both of these connectorsallow communication between the reader and a controlling device. The pin assign-ment for the SUB-D connector is given in Table 13 and the pin assignment for theWECO connector is given in Table 14. Both, the ASCII and TIRIS Bus protocol can be used with the RS232 interface. All interface parameters are according to the RS232 specification and are not givenin detail in this manual. The DTR and DSR lines are currently not used for any pur-pose. Table 13: RS232 SUB-D ConnectorPin Signal Description Direction1 - Not connected -2 TxD Transmit Data Output3 RxD Receive Data Input4 DTR Data Terminal Ready Input5 GND Signal Ground -6 DSR Data Set Ready Output7 - Not connected -8 - Not connected -9 - Not connected - Table 14: RS232 WECO ConnectorPin Signal Description Direction1 RxD Receive Data Input2 DTR Data Terminal Ready Input3 GND Signal Ground -4 TxD Transmit Data Output5 DSR Data Set Ready Output6 GND Signal Ground -

18S2510 Reader - Reference Guide April ’002.2.1.7 G - RS422/RS485 Communications Interface Depending on the DIP-Switch configuration, the Reader will communicate via theRS232, RS422 or RS485 interface. RS422/485 connections are made via the 6-pinWECO connector (G in Figure 3). Its pin assignment is given in Table 15 and its spec-ifications are given in Table 16. Both, the ASCII and TIRIS Bus Protocol can be used with the RS422 interface. The ASCII protocol (or any other full-duplex protocol) cannot be used with the RS485interface. Table 15: RS422/RS485 ConnectorPin Signal Description DirectionRS422 DirectionRS4851Rx+/Tx+RS422/RS485 non-inverted data Input Input/Output2 Rx-/Tx- RS422/RS485 inverted data Input Input/Output3 GND Signal Ground - -4Tx+RS422 non-inverted data Output/High Impedance -5 Tx- RS422 inverted data Output/High Impedance -6 GND Signal Ground - - Table 16: RS422/RS485 Communications Interface - SpecificationsParameter SpecificationMode of Operation DifferentialNumber of Drivers On Line 32 Number of Receivers On Line 32 Maximum Cable Length 1200 mMaximum Data Rate 10 Mbits/sMaximum Common Mode Voltage +12 V / -7 VDriver Voltage High > +1.5 VLow < -1.5 VDriver Load 60 mADriver Output Short Circuit Limit 150mA to GND250mA to VCCReceiver Input 12 kΩReceiver Sensitivity ±200 mVReceiver Hysteresis 60 mV

19April ’00 Chapter 2. Hardware2.2.1.8 H - Indicator Outputs This connector (H in Figure 3) is a 2 x 3-pin (double row) pin header connection whichprovides the LED output signals. Its pin assignment is given in Table 17 and its spec-ifications are given in Table 18. 2.2.1.9 I - Antenna ConnectorThe antenna must be connected to the reader via the antenna terminals. The pin as-signment for the antenna connector is given in Table 19. If a custom designed anten-na is used, it must be within the specifications defined in Table 20 in order to ensurethat the dynamic autotuning facility functions correctly. Table 17: Indicator OutputsPin Signal Description Direction1 ACTIVE Open collector output: RF Module transmitter signal Output2VR270 Current limited output: (270 Ω in series to VCC) Output3 O.K. Open collector output: O.K. signal Output4VR270 Current limited output (270 Ω in series to VCC) Output5 RXSA Receiver signal strength adjust output to monitor the receiver signal strength threshold level Output6 GND Signal ground - Table 18: Indicator Outputs - SpecificationsParameter Minimum MaximumOpen Collector (voltage) - 10 VOpen Collector (current) - 80 mAMaximum voltage at current limiting 270 Ω resistor - 5 VReceiver signal strength output voltage (RXSA) 0.7 V 1.7 V Table 19: Antenna Pin Signal Description1 ANT Tx/Rx antenna2 ANT Tx/Rx antenna Table 20: Antenna - SpecificationsParameter Minimum MaximumAntenna Resonance Voltage - 380 VpeakAntenna Inductance 26.0 µH 27.9 µHAntenna Q-factor 40 350

20S2510 Reader - Reference Guide April ’002.2.2 SwitchesThere are three banks of DIP switches on the S251B Reader, one is for the ControlModule set-up (12 switches), one is for the RS422/RS485/DAT settings (5 switches),and the third one is for the synchronization settings (5 switches). The Control Moduleset-up switches are listed in Table 21, the RS422/RS485/DAT settings are listed inTable 23, and the synchronization settings switches are listed in Table 24. The ONposition and switch 1 are always shown in the switch bank, the switch is on when theswitch is set to the up position. Figure 4: CTL Setup Switches* When this switch (11) is switched either from ON-to-OFF or from OFF-to-ON the reader’s transmitter is activated for 10 seconds. Table 21: CTL Setup DIP SwitchesSwitch OFF ON1 RAM - VCC -2Chip Select ROM for TIRIS Standard Firmware Reserved for Software Development3 Reserved for Software Development Chip Select RAM for TIRIS Standard Firmware4Chip Select RAM for TIRIS Standard Firmware Reserved for Software Development5 PSEN Reserved for Software Development6 See Table 227 See Table 228 TIRIS Standard Configuration Customer Specific Configuration9 Reserved10 Reserved11 TXCT-ON *12 Not Connected Table 22: I/O Setting Switches (6 & 7)SW6 SW7 CommentOFF OFF No effectON ON/OFF Reset reader by switching RS232 DTR lineOFF ON Can be used by customer firmware for hardware handshakeON1

21April ’00 Chapter 2. HardwareFigure 5: RS422/RS485/DAT SwitchesFigure 6: Synchronization DIP Switches Table 23: RS422/RS485/DAT Settings DIP SwitchesSwitch OFF ON1 RS422 RS4852 RS422 RS4853- RS422/RS485 Rx+/Rx-line-to-line termination (120 Ω) 4 DAT Disabled DAT Enabled5 DAT LEDs Disabled DAT LEDs EnabledNotes:SW1 and SW2 must always be in the same position as each other, either both OFF or both ON. Table 24: Synchronization DIP SwitchesSwitch OFF ON1 - Synchronization Rx+ line pull-up (180 Ω)2 - Synchronization Rx- line pull-down (180 Ω)3- RS422/RS485 Rx+/Rx- line-to-line termination (120 Ω)4 Set the RFM to Master Set the RFM to Slave in CPS Bus5 - CPS line-to-line termination (120 Ω)ON1ON1

22S2510 Reader - Reference Guide April ’002.2.3 IndicatorsThere are six LEDs on the front panel of the reader they are described in Table 25. The TX Active and Read O.K. LED lines are also made available for external use ifrequired, details are given in section 4.7. 2.2.4 PotentiometersThere are two potentiometers that can be adjusted through the reader front panel,they are: the RF Power Output adjustment potentiometer (2.2.4.1) and the EMI /Sync. Level adjustment potentiometer (2.2.4.2). 2.2.4.1 RF Power AdjustmentThe potentiometer can be used to adjust the internal oscillator pulse width and thusthe generated antenna voltage/field strength. Turning the potentiometer clockwisecauses the field strength to be increased. 2.2.4.2 EMI / Sync. Level AdjustmentThis potentiometer allows the receiver signal strength threshold level to be adjustedfor wireless synchronization. Turning the potentiometer clockwise results in maxi-mum sensitivity. There is one fuse on the S251B that is: 2A Slow-blow. If the fuse should blow, replaceit with the replacement fuse supplied with your reader. 2.3 Mechanical InformationThe mechanical dimensions and weight are given in Table 26. Table 25: IndicatorsIndicator DescriptionEMI Indicates the presence of Electro Magnetic interferenceTX Active Indicates activation of the RF transmitterRead O.K. Indicates a response from a valid transponderAntenna TuningL ↑Antenna out of tune, inductance too highO.K. The DAT has tuned the antenna to maximum resonance voltageL ↓Antenna out of tune, inductance too low Table 26: Mechanical InformationParameter ValueHeight 120 mmWidth 120 mmLength 200mmWeight 900 g

CHAPTER 323SynchronizationChapter 3:SynchronizationIf you are using more than one reader in an application, it may mean that you needto synchronize their operation so that they do not interfere with each other. Thischapter describes the various synchronization options. Topic Page3.1 Introduction ................................................................................................243.2 Types of Synchronization .........................................................................243.2.1 No Synchronization ..............................................................................243.2.2 Wireless Synchronization.....................................................................253.2.3 Wired Synchronization .........................................................................253.2.4 Combined Wireless/Wired Synchronization .........................................253.2.5 Master/Slave Synchronization..............................................................263.2.5.1 M/S Synchronization without Acknowledgement........................263.2.5.2 M/S Synchronization with Acknowledgement. ............................263.2.5.3 Triggered Synchronization..........................................................273.2.6 Carrier Phase Synchronization ............................................................27

24S2510 Reader - Reference Guide April ’003.1 IntroductionWhere multiple readers are operating in the same area, it is necessary to coordinatethe activities of those readers to avoid mutual interference. This is known as synchro-nization. Synchronization in this context means that the readers in your applicationare controlled in such a way that they do not interfere with each other. There are several types of synchronization that can be used depending on the situ-ation in a particular application, for example: the type of transponder, the type of op-eration performed on that transponder (Charge-only read, General read, Programpage, Lock page), the size of the antennas and the speed of the transponder. Thedifferent kinds of synchronization are described in section 3.2. How to actually set-up your system to use the synchronization you’ve chosen is described together withthe other installation procedures in Chapter 5. The distance that readers’ antennas have to be separated before the need for somemethod of synchronization is required, varies with local conditions, for in addition topurely airborne (radiated) interference, signals can travel from one reader to anothervia metal structures (conducted). Metal structures can include the frames of metalbuildings, reinforcing bars in concrete floors and power or data cables.3.2 Types of SynchronizationThe S251B Reader can be configured to synchronize in a number of different ways:No Synchronization (3.2.1)Wireless Synchronization (3.2.2)Wired (3.2.3)Combined Wireless/Wired (3.2.4)Master/Slave Synchronization (3.2.5)Carrier Phase Synchronization (3.2.6)3.2.1 No SynchronizationThis option is only used in conjunction with Software synchronization, or if there isonly a single reader. No sync. and Master/Slave sync without acknowledgement arethe fastest methods of reading transponders.If all readers are connected by the same RS485 data network, coordination of thereaders can be controlled directly by the Host Computer. For example, the HostComputer may issue a Broadcast command for all readers to simultaneously performa read cycle and buffer the result. Another technique possible using the data networkis to issue individual commands to each reader in turn. This technique is used whenwriting data to Multipage Transponders (MPTs). Where a PLC has a number ofpoint-to-point connections to readers, it is also possible to coordinate the activitiesvia the ladder logic. With Software synchronization all readers will be simultaneouslytransmitting or, each reader individually operating. In both cases the readers can beconfigured to have No Synchronization.

25April ’00 Chapter 3. Synchronization3.2.2 Wireless SynchronizationWireless synchronization can be used to control the coordination of readers, withstandard antennas, provided the electrical noise in the environment is low for thetype of antenna in use and the noise levels are constant. Wireless synchronization is only valid for charge-only reading of transponders.During operation, when the reader detects noise above the adjusted background lev-el it assumes that it is another reader and “backs-off” for a set period before com-mencing its own cycle. Wireless synchronized readers can read together oralternately. Advantages:1. There are no wires to run.2. All readers are autonomous (no Master unit).3. Enables Hand held readers to co-exist with fixed units (using wireless syn-chronization).Disadvantages:1. In noisy environments, there is too much sensitivity with larger antennas(G04 and larger custom antennas) to allow accurate setting of the back-ground levels.2. It is not suitable for operations other than Charge-only read.3. It cannot be used when other readers are writing information to transpond-ers.4. Where the environmental conditions change, for example: a ground loopantenna’s characteristics are changed by a vehicle over it, the synchroni-zation adjustment could be wrong.3.2.3 Wired SynchronizationWired Synchronization works in the same way as wireless synchronization with theexception that the reader obtains its information about the presence of another read-er through a hard wired connection and not via the antenna. Advantages:1. It is a Peer-to-Peer network and does not need a Master unit. 2. It use a single twisted pair cable. Disadvantages:1. It is only suitable for charge-only reading of transponders.2. It cannot be used when other readers are writing information to transpond-ers.3. If the power fails at any of the readers the bus fails.3.2.4 Combined Wireless/Wired SynchronizationWhen this option is selected, groups of reader connected by the wired synchroniza-tion cabling can synchronize with other groups of wired synchronization readers, orwith individual readers, by using wireless synchronization. The advantages and disadvantages of both wireless and wired synchronization asgiven above still apply.

26S2510 Reader - Reference Guide April ’003.2.5 Master/Slave SynchronizationMaster/Slave Synchronization is probably the most commonly used form of synchro-nization. One reader is configured to be the Master and this reader then controls allthe other readers, which are configured as Slaves. There are three variants: Master/Slave Synchronization without Acknowledgement, Master/Slave Synchronization with Acknowledgement Triggered Synchronization. 3.2.5.1 M/S Synchronization without Acknowledgement.This method of synchronization is the fastest method of reading transponders andwas originally developed for reading tagged vehicles at speed. It assumes that allreaders are on the same synchronization bus and the readers would not, for exam-ple, recognise a handheld reader that is trying (probably unsuccessfully) to performa reading.Advantages:1. Uses a single twisted pair cable.2. Has the fastest read rate.3. The Master can be used for Charge-only read or Write/Program.Disadvantages:1. All readers must be on the same synchronization bus.2. If the Master fails, all units stop.3. Slave units cannot be individually tested without the Master running.4. Slaves must perform exactly the same RF-Task as the Master (read thesame page, write the same data to a transponder).3.2.5.2 M/S Synchronization with Acknowledgement.In Master/Slave Synchronization without acknowledgement, if a slave reads a trans-ponder and the master doesn’t, the slave may miss the next pulse while it is process-ing the reading from that transponder. In Master/Slave with Acknowledgement theMaster has to wait until all slaves have completed their current cycle before initiatingthe next cycle. This is achieved by using a 4 wire synchronization bus (twin twistedpair) with the slave transmit lines coupled back to the Master receive lines.This method has the following advantages over Master/Slave without Acknowledge1. All units can Write/Program transponders (providing they do it together). 2. They wait for the slowest to complete.Disadvantages:1. The cable is a twin twisted pair.2. The readers cannot be too close if writing is performed, because of the pos-sibility of corrupted data. This restriction also includes the paged read ofmultipage transponders.

27April ’00 Chapter 3. Synchronization3.2.5.3 Triggered SynchronizationTriggered Synchronization is a Master/Slave Synchronization Bus where there is justa pulse signal. All readers are configured as masters, but it is only one unit or a trig-ger pulse source that issues the synchronization pulse at suitable intervals for the re-quired operations on the transponder. The more complex version of this is known as a Timing Bus, when different time win-dows are defined for different operations to be carried out, for example: If multiplereaders are required to read addressed pages of Multipage transponders, then towrite data back to the transponders, the timing bus would start a read window lasting90 ms then initiate a time window of 320 ms for a write operation. In this way the dif-fering times required for the two operations can be accommodated. At the same timethe readers would be instructed thru the communication interface, about which com-mand to execute during each window. Therefore the slaves have to receive theircommand before the master. Advantages:1. The master unit has total control over the coordination of the connected de-vices and can allow ‘windows’ for particular operations. 2. Reading and Writing can be accommodated, if there is sufficient separationto prevent data corruption during the Write process. Disadvantages:1. Cannot be used for addressing MP transponders if readers are close to-gether as addressing conflicts can arise.2. Carrier Phase synchronization cannot be used.3.2.6 Carrier Phase Synchronization In some applications it is necessary to use several charge-up antennas close to eachother. In these circumstance, the magnetic charge-up fields generated by differentantennas superimpose on each other and may cause a beat effect on the magneticcharge-up field, due to the slightly different transmission phases of different Powerreaders. This effect will not occur when the transmitters of different readers are op-erated from the same oscillator signal. This is Carrier Phase Synchronization where all of the readers in a system use thesame oscillator. Carrier Phase synchronization must be used whenever Gate or Stickantennas are facing each other and if they are inside the distances D1 or D2 as givenin Table 27 (Figure 7 shows the places to measure D1 and D2). This ensures thatthere will not be any “beat effect” between the antennas. Note:Remember that putting two antennas close together also changes antenna inductance, so that the antennas may no longer be tuneable to resonance.

28S2510 Reader - Reference Guide April ’00Figure 7: Distance between Antennas (top view) Table 27: Distances Between AntennasAntenna type Distance D1 [m] Distance D2 [m]RI_ANT_S02 <=> RI_ANT_S02 0.8 1.0RI_ANT_G01 <=> RI_ANT_G01 1.7 1.5RI_ANT_G02 <=> RI_ANT_G02 1.3 1.0RI_ANT_G04 <=> RI_ANT_G04 2.0 1.7

CHAPTER 429InstallationChapter 4:InstallationThis chapter provides you with the information that you need to know in order to in-stall the reader. This chapter also describes how to incorporate the various synchronization options. Topic Page4.1 Introduction ................................................................................................304.2 General........................................................................................................304.3 Mechanical Mounting.................................................................................304.3.1 Power Supply .......................................................................................304.4 Communication..........................................................................................314.4.1 Configuration........................................................................................314.4.2 RS232 ..................................................................................................314.4.2.1 Activation ....................................................................................324.4.3 RS422 ..................................................................................................324.4.4 RS485 ..................................................................................................334.5 Synchronization .........................................................................................344.5.1 Software Controlled..............................................................................344.5.2 Wireless Synchronization.....................................................................344.5.3 Wired and Combined Wireless/Wired Synchronization........................344.5.4 Master/Slave (without acknowledgement) & Triggered Synch.............354.5.5 Master/Slave (with acknowledgement) ................................................364.5.6 Transmitter Carrier Phase Synchronisation (CPS) ..............................374.6 General Purpose Input/Outputs................................................................384.7 LED Outputs ...............................................................................................394.8 Reset ...........................................................................................................394.9 Antenna.......................................................................................................404.10 RF Power Output Adjustment...................................................................404.11 EMI / Sync. Level Adjustment ...................................................................40

30S2510 Reader - Reference Guide April ’004.1 Introduction4.2 GeneralThe S251B Reader has been designed with easy installation in mind. The followinginformation provides you with any details such as switch settings and so on that youwill need to know. 4.3 Mechanical Mountinga. If you are mounting the reader on a DIN rail TS35, clip the reader into the bot-tom of the rail and then snap it into the top. orb. If you are mounting the reader onto a wall where there is No vibration, snap inthe four mounting adapters and screw the reader to the wall using M4 screws. orc. If you are mounting it onto a wall where it may be subject to vibration, open thereader, drill thru the marked mounting holes and screw the reader to the wallusing M4 screws and the appropriate washers. 4.3.1 Power SupplyConnect a Regulated dc power supply (between 10 and 24 V providing a minimumof 2A) to the reader - the polarity of the connection is shown on the front panel of thereader. Set the Power Range Setting wire bridge to match your input voltage (see Table 2).We recommend that you use a linear power supply. If this is not possible and youwish to use a switched mode power supply, DO NOT use one that operates below200 kHz. (switched mode power supplies that operate below 200 kHz. might interferewith transponder signals and thus reduce the reading range). Note:Always ensure that the reader is switched off when making or break-ing connections to it.WARNING:CARE MUST BE TAKEN WHEN HANDLING THE S251B. HIGH VOLTAGE ACROSS THE ANTENNA TERMINALS COULD BE HARMFUL TO YOUR HEALTH. IF THE ANTENNA INSULATION IS DAMAGED THE ANTENNA SHOULD NOT BE CONNECTED TO THE S251B.

31April ’00 Chapter 4. Installation4.4 CommunicationFollow the instructions given in the section that describes the communications set-up that you have decided to use in your system: Section 4.4.2 for RS232, Section4.4.3 for RS422 and Section 4.4.4 for RS485. 4.4.1 Configuration CTL Setup switch 8 determines the mode of operation of the control module whenpower is applied to the control module. When CTL Setup switch 8 is in the OFF po-sition, standard TIRIS default parameters are used, these are:- ASCII protocol- 9600 baud, eight databits, no parity, one stop bit, Xon/Xoff enabled- Normal Mode- Wireless synchronization- I/O 0 to 3 defined as input- I/O 4 to 7 defined as output and logic high- Hardware interface RS232CIf CTL Setup switch 8 is in the ON position, customer specific parameters are usedto operate the Control Module. These application specific parameters are stored inthe serial EEPROM on the Control Module.You can use the Software Utility Program which is available on the internet at oursite: http://www.tiris.com to configure your reader. In order to configure the reader for customer specific parameters you must connectthe reader via the RS232 port (connector F1 or F2) to your host and get connectionusing the TIRIS standard parameters (with CTL Setup switch 8 is in the OFF posi-tion). Change the default parameters to the customer specific parameters and savethem. Set CTL Setup switch 8 to the ON position and reset the reader. The readerwill then work with the customer specific parameters. 4.4.2 RS232Either connect a 9-pin SUB-D female plug to the SUB-D connector, or connect up the6-pin WECO connector marked “RS232” on the reader’s front panel, the pin signalsare given in Table 28 or Table 29. Note:The setting of CTL Setup switch 8 is only checked after power on. Table 28: RS232 9-pin ConnectorPin Signal Description Direction1 - Not connected -2 TxD Transmit Data Output3 RxD Receive Data Input4 DTR Data Terminal Ready Input

32S2510 Reader - Reference Guide April ’004.4.2.1 ActivationThe Data Terminal Ready signal (DTR) is connected to the reset/watchdog circuit ofthe S251B Reader. This ensures a PC controlled microcomputer initialization beforethe default Read Mode is started.When power is applied to the reader the Data Set Ready signal (DSR) of the RS232-C interface is activated. 4.4.3 RS422Connect the WECO (marked RS422 / 485) connector as shown in Table 30. Set theswitches as shown in Figure 8. If you are only using one reader the line terminalswitch 3 must be switched to ON, if you are using more than one reader only the lastreader in the line must be switched to ON (all other readers to OFF). 5 GND Signal Ground -6 DSR Data Set Ready Output7 - Not connected -8 - Not connected -9 - Not connected - Table 29: RS232 WECO ConnectorPin Signal Description Direction1 RxD Receive Data Input2 DTR Data Terminal Ready Input3 GND Signal Ground -4 TxD Transmit Data Output5 DSR Data Set Ready Output6 GND Signal Ground - Table 28: RS232 9-pin ConnectorPin Signal Description Direction

33April ’00 Chapter 4. InstallationFigure 8: Switch Settings for RS4224.4.4 RS485Connect the WECO (marked RS422 / 485) connector as shown in Table 30. Set theswitches as shown in Figure 9. If you are only using one reader the line terminalswitch 3 must be switched to ON, if you are using more than one reader only the lastreader in the line must be switched to ON (all other readers to OFF). Figure 9: Switch Settings for RS485 Table 30: RS422/RS485 ConnectorPin Signal Description DirectionRS422 DirectionRS4851Rx+/Tx+RS422/RS485 non-inverted data Input Input/Output2 Rx-/Tx- RS422/RS485 inverted data Input Input/Output3 GND Signal Ground - -4Tx+RS422 non-inverted data Output/High Impedance -5 Tx- RS422 inverted data Output/High Impedance -6 GND Signal Ground - -ON1ON1

34S2510 Reader - Reference Guide April ’004.5 Synchronization4.5.1 Software ControlledThere is no special wiring required for this type of synchronization. Make sure thatyou set the software configuration to No Sync. when you are configuring the reader. 4.5.2 Wireless SynchronizationThere are no switch or jumper settings for wireless synchronization. Make sure thatyou set the software configuration to wireless synchronization when you are config-uring the reader. 4.5.3 Wired and Combined Wireless/Wired SynchronizationFigure 10 shows in which way the S251B Reader must be connected for a wired anda combined wireless/wired synchronization. Make sure that you set the software con-figuration to match when you are configuring the reader. Table 31 explains the set-ting of the Synchronization DIP switches 1, 2 & 3.Figure 10: Wired & Combined Wireless/Wired Sync. Interface Connection Table 31: Wired and Combined Wireless/Wired SynchronizationLine Termination Dip Switch UNIT 1: UNIT 2...UNIT n-1: UNIT n:SW1 ON OFF ONSW2 ON OFF ONSW3 ON OFF ON (see Note)Note:If the distance between Unit 1 and Unit n is less than approximately 400 m, DIP switch SW3 can be left OFF.

35April ’00 Chapter 4. Installation4.5.4 Master/Slave (without acknowledgement) & Triggered Synch.Figure 11 shows the way that the Readers have to be connected for master/slavesynchronization without acknowledgment; and triggered synchronization. Make surethat you set the software configuration to Master or Slave (according to Table 32 andTable 33) acknowledgement) when you are configuring the reader. Table 32 and Table 33 show the settings of the Line termination DIP switches.Figure 11: Master/Slave Sync. Interface Connection (without Ack.) Table 32: Master/Slave Synchronization Without AcknowledgementLine Termination Dip Switch Unit 1: (Master) Unit 2...Unit n-1: (Slaves) UNIT n: (Slave)SW1 ON OFF ONSW2 ON OFF ON SW3 OFF OFF ON (see Note)Note:If the distance between Unit 1 and Unit n is less than approximately 400 m, DIP switch SW3 can be left OFF. Table 33: Triggered SynchronizationLine Termination Dip SwitchUNIT 1: Trigger Unit UNIT 2...UNIT n-1: (Master) UNIT n: (Master)SW1 Termination not required OFF ONSW2 Termination not required OFF ONSW3 Termination not required OFF ON (see Note)

36S2510 Reader - Reference Guide April ’004.5.5 Master/Slave (with acknowledgement)Figure 12 shows the way that the Readers have to be connected for master/slavesynchronization with acknowledgement. Make sure that you set the softwareconfiguration to Master or Slave (according to Table 34) when you are configuringthe reader. Table 34 shows the setting of DIP switch switches 1, 2 & 3.Figure 12: Master/Slave Synchronization Interface Connection Table 34: Master/Slave Synchronization With AcknowledgementLine Termination Dip Switch Unit 1: (Master) Unit 2...Unit n-1: (Slaves) UNIT n: (Slave)SW1 ON OFF ON SW2 ON OFF ONSW3 ON OFF ON (see Note)Note:If the distance between Unit 1 and Unit n is less than approximately 400 m, DIP switch SW3 can be left OFF.

37April ’00 Chapter 4. Installation4.5.6 Transmitter Carrier Phase Synchronisation (CPS)To allow you to overcome the beat effect, the pulse width modulated oscillator signalis accessible at the CPS connector D. All readers to be driven by one oscillator musthave their CPS connectors connected together as shown in Figure 13. DIP switch Synchronization-SW4 determines whether the internal oscillator or theexternal oscillator signal is used. When the DIP switch Synchronization-SW4 is OFF,the internal oscillator is used and the reader is referred to as an oscillator MASTER.When the DIP Switch Synchronization-SW4 is ON, the external oscillator signal isused and the reader is referred to as an oscillator SLAVE. Figure 13: Carrier Phase Synchronisation Interface ConnectionMaster SlaveIf you are using carrier phase synchronization you must configure your system toMaster/Slave in order to have one common master. Note:Only one oscillator MASTER is allowed per synchronized system.to otherunits

38S2510 Reader - Reference Guide April ’004.6 General Purpose Input/Outputs The S251B Reader has 8 connections that can be defined as either inputs or outputs(TTL level). These input/outputs must be configured in groups of 4 as shown in Table35. I = Input; O = Output Table 35: General Purpose Inputs/OutputsI/O I/O0 1 2 3 4 5 6 7I I I I I I I II I I I O O O OO O O O I I I IO O O O O O O O

39April ’00 Chapter 4. Installation4.7 LED OutputsThe signals used for the indicator LEDs (Read O.K. and Transmitting) are availableat Indicator Outputs connector (H), they can be used to drive external LEDs or buzz-ers, they must be connected as shown in Figure 14. Ensure that the values given Ta-ble 18 are not exceeded. Figure 14: Connecting the LED Outputs4.8 ResetThe S251B Reader provides a connection for an external reset on pin 12 of the Gen-eral Purpose Input / Output connector (B). This pin can be used reset the S251BReader externally. You can apply an external reset to the reader by connecting apush-button to the connectors as shown in Figure 15. Figure 15: RESET Push-button WiringGENERAL I/O PORTRESET-GND1215

40S2510 Reader - Reference Guide April ’004.9 AntennaThe S251B Reader can be used together with the TIRIS antennas RI-ANT-G01E, RI-ANT-G02E, RI-ANT-G04E and RI-ANT-S02C. If you wish to use it with your own de-sign antenna that antenna must conform to the specifications given in Table 36. Table 36: Antenna SpecificationsThe antenna must be connected to the terminals marked Antenna on the S251B. 4.10 RF Power Output AdjustmentUse the RF Power Output Adj. potentiometer to adjust the internal oscillator pulsewidth and subsequently the antenna output voltage to conform to your local regula-tions. Turning the potentiometer clockwise causes the field strength to increase. 4.11 EMI / Sync. Level AdjustmentEMI / Sync. Level Adj. potentiometer to adjust the receiver signal strength thresholdfor the wireless synchronization. Turning the potentiometer clockwise results in amaximum sensitivity. If wireless synchronization is used, it is important that the EMI/Sync level Adj. poten-tiometer is correctly adjusted. This is one of the final adjustments to the reader andis done on site in the final location once the antenna has been tuned and ALL THEOTHER READER ARE SWITCHED OFF. Turning the potentiometer adjusts the receiver signal level threshold and you mustset the reader’s ‘base level noise’ in its final location, so that any signal larger thanthe base level triggers the synchronization algorithm. Send a single ‘X’ (execute command) to the reader to stop any continuous reading,and then turn the potentiometer clockwise until the yellow LED is fully lit. Slowly ad-just the potentiometer back until the LED just goes out. Adjustment is then complete. Note:The Stick Antenna (RI-ANT-S02C) must only be used together with a reader supply voltage up to 12 V. If you use this antenna with a higher reader supply voltage the antenna becomes too warm which effects the antenna’s Q. Parameter Minimum MaximumAntenna Resonance Voltage - 380 VpeakAntenna Inductance 26.0 µH 27.9 µHAntenna Q-factor 40 350

CHAPTER 541Warnings, Cautions and NoticesChapter 5: Warnings, Cautions and NoticesThis chapter provides the Warnings, Cautions and Notices that are relevant to theS251B reader. Topic Page5.1 FCC/PTT Regulations ................................................................................425.2 Important note to Purchasers/Users of the S251B Reader in the U.S.A.425.3 WARNING....................................................................................................42

42S2510 Reader - Reference Guide April ’005.1 FCC/PTT RegulationsThe TIRIS Reader RF produces emissions at 134.2 kHz. The radiation of the funda-mental and the harmonics will vary with the type of antenna and other devices orfunctions connected to the Reader.Prior to operating the S251B Reader together with antenna(s) and power supply, therequired FCC, PTT or relevant government agency approvals must be ob-tained.Sale, lease or operation in some countries may be subject to prior approval bythe government or other organizations.5.2 Important note to Purchasers/Users of the S251B Reader in the U.S.A.The TIRIS Reader is considered by the Federal Communications Commission (FCC)to be a "subassembly". As such, no prior approval is required to import, sell or other-wise market the Reader in the United States. In order to form a functioning radio fre-quency (RF) device, the Reader must be connected to a suitable antenna and powersupply. A radio frequency device may not be operated unless authorized by the FCCnor may a radio frequency device be marketed (i.e. sold, leased, imported, or adver-tised for sale or lease) without the prior grant of an FCC equipment authorization.FCC authorization to operate an RF device may take one of two forms: first, the FCCmay grant the user an experimental license; second, the FCC may issue an equip-ment authorization permitting use of the RF device on an unlicensed basis. TI canassist the user in obtaining an experimental license that will cover a specific installa-tion of the S251B Reader in a specific site or sites. Experimental authorizations areappropriate to cover operations during the development of an RF device. A grant ofequipment authorization (known as "certification") must be obtained from the FCCbefore RF devices are marketed or operated on a non development basis.DEVICES CONSTRUCTED FOR EVALUATION INCORPORATING THIS ReaderSHOULD BE OPERATED ONLY UNDER AN EXPERIMENTAL LICENSE ISSUEDBY THE FCC AND MAY NOT BE MARKETED. BEFORE ANY DEVICE CONTAIN-ING THIS Reader IS MARKETED, AN EQUIPMENT AUTHORIZATION FOR THEDEVICE MUST BE OBTAINED FROM THE FCC.Prospective marketers of devices containing this Reader are responsible for obtain-ing the necessary equipment authorization. Upon request TI can provide assistancein obtaining FCC approval to market devices incorporating this Reader. 5.3 WARNINGCare must be taken when handling the S251B. High voltage across the antenna ter-minals could be harmful to your health. If the antenna insulation is damaged the an-tenna should not be connected to the Reader.

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