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S251B
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Texas Instruments S251B User Manual

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April ’00 Preface
FCC ID: A92S251B
Series 2000 Reader System
Reader S251B RI-STU-251B
Reference Guide
11-06-21-054 April 2000
1
Edition One - April 2000
This is the first edition of this manual, it describes the following equipment:
TIRIS Reader S251B
Texas Instruments (TI) reserves the right to make changes to its products or services or to discontinue any p roduc t o r se rvi ce at a ny ti me with out not ic e. T I prov id es cu s­tomer assistance i n various technic al areas, but do es not have full ac cess to data concerning the use and applications of customer's products.
Therefore, TI assumes no liability and is not responsible for customer applications or product or software design or performance relating to systems or applications incor­porating TI produ cts. In addi tion, TI assu mes no liab ility and i s not respons ible for infringement of patents and/or any other intell ectual or industrial proper ty rights of third parties, which may result from assistance provided by TI.
TI products are not designed, intended, authorized or warranted to be suitable for life support applications or a ny othe r li fe cr iti ca l appl ic ati on s wh ic h cou ld inv ol v e po ten­tial risk of death, personal injury or severe property or environmental damage.
RI-STU-251B
The Incorporated.
Copyright 2000 Texas Instruments Incorporated (TI) This document may be downloaded onto a computer, stored and duplicated as nec-
essary to support the us e of the related TI products. Any othe r type of duplicatio n, circulation or storage on data carriers in any manner not authorized by TI represents a violation of the applicable copyright laws and shall be prosecuted.
logo and the word
TIRIS
TIRIS
2
are registered trademarks of Texas Instruments
About This Guide
Conventions
PREFACE
Read This First
This manual describes t he 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 in Chapter 5.
WARNING:
WARNING IS USED WHERE CARE MUST BE TAKEN, OR A CERTAIN
A
PROCEDURE
HARM TO YOUR HEALTH
OR
MUST BE FOLLOWED IN ORDER TO PREVENT INJURY
.
If You Need Assistance
Application Centers are located in Europe, North and S outh Amer ica, the Far E ast and Australia to provide direct su pport. For more information, please contact your nearest TIRIS Sales and Application Center. The contact addresses can be found on our home page:
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 soft­ware easier
http://www.tiris.com
3
Document Overview
Page
Chapter 1: Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 General............................................................................................... 7
1.2 System Description ............................................................................ 7
1.3 Product Description....................................... ...... ....... ...... ....... ........... 7
Chapter 2: Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 General............................................................................................. 10
2.2 Product Description....................................... ...... ....... ...... ....... ......... 10
2.3 Mechanical Information.................................................................... 22
Chapter 3: Synchronization. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
3.1 Introduction....................................................................................... 24
3.2 Types of Synchronization................................................................. 24
Chapter 4: Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
4.1 Introduction....................................................................................... 30
4.2 General............................................................................................. 30
4.3 Mechanical Mounting ....................................................................... 30
4.4 Communication ................................................................................ 31
4.5 Synchronization................................................................................ 34
4.6 General Purpose Input/Outputs........................................................ 38
4.7 LED Outputs........... ....... ...... ...... ....... ...... ....... ...... ....... ...... ................ 39
4.8 Reset................................................................................................ 39
4.9 Antenna............................................................................................ 40
4.10 RF Power Output Adjustment........................................................... 40
Chapter 5: Warnings, Cautions and Notices . . . . . . . . . . . . . . . . . . . . . . . . . . 41
List of Figures
Figure 1: S251B Reader ................................................................................ 7
Figure 2: S251B Front Panel (with connector covers removed) .................. 10
Figure 3: S251B Connector Locations ......................................................... 11
Figure 4: CTL Setup Switches ..................................................................... 20
Figure 5: RS422/RS485/DAT Switches ....................................................... 21
Figure 6: Synchronization DIP Switches...................................................... 21
Figure 7: Distance between Antennas (top view)......................................... 28
Figure 8: Switch Settings for RS422 ............................................................ 33
Figure 9: Switch Settings for RS485 ............................................................ 33
Figure 10: Wired & Combined Wireless/Wired Sync. Interface Connection 34
Figure 11: Master/Slave Sync. Interface Connection (without Ack.)............ 35
Figure 12: Master/Slave Synchronization Interface Connection .................. 36
Figure 13: Carrier Phase Synchronisation Interface Connection................. 37
Figure 14: Connecting the LED Outputs ...................................................... 39
Figure 15: RESET Push-button Wiring ........................................................ 39
Page
4
April ’00 Preface
List of Tables
Table 1: List of Connectors .......................................................................... 11
Table 2: Power Range Settings ................................................................... 12
Table 3: Supply Connector........................................................................... 12
Table 4: Supply Connector - Specifications ................................................. 13
Table 5: General Purpose Inputs/Outputs.................................................... 13
Table 6: General Purpose Inputs/Outputs - Specifications .......................... 14
Table 7: Synchronization Interface............................................................... 14
Table 8: Synchronization Interface - Specifications ..................................... 14
Table 9: Carrier Phase Synchronization Interface ....................................... 15
Table 10: CPS Interface - Specifications ..................................................... 15
Table 11: Open Collector & I/Os .................................................................. 16
Table 12: Open Collector & I/Os - Specifications......................................... 16
Table 13: RS232 SUB-D Connector ............................................................ 17
Table 14: RS232 WECO Connector ............................................................ 17
Table 15: RS422/RS485 Connector............................................................. 18
Table 16: RS422/RS485 Communications Interface - Specifications.......... 18
Table 17: Indicator Outputs.......................................................................... 19
Table 18: Indicator Outputs - Specifications ................................................ 19
Table 19: Antenna........................................................................................ 19
Table 20: Antenna - Specifications .............................................................. 19
Table 21: CTL Setup DIP Switches.............................................................. 20
Table 22: I/O Setting Switches (6 & 7)......................................................... 20
Table 23: RS422/RS485/DAT Settings DIP Switches.................................. 21
Table 24: Synchronization DIP Switches ..................................................... 21
Table 25: Indicators...................................................................................... 22
Table 26: Mechanical Information................................................................ 22
Table 27: Distances Between Antennas ...................................................... 28
Table 28: RS232 9-pin Connector................................................................ 31
Table 29: RS232 WECO Connector ............................................................ 32
Table 30: RS422/RS485 Connector............................................................. 33
Table 31: Wired and Combined Wireless/Wired Synchronization................ 34
Table 32: Master/Slave Synchronization Without Acknowledgement .......... 35
Table 33: Triggered Synchronization ........................................................... 35
Table 34: Master/Slave Synchronization With Acknowledgement............... 36
Table 35: General Purpose Inputs/Outputs.................................................. 38
Table 36: Antenna Specifications................................................................. 40
Page
5
Chapter 1: Introduction
This introduces you to the S251B Reader, what it is and what it does.
Topic Page
1.1 General..........................................................................................................7
1.2 System Description............ ....... ...... ...... ....... ...... ....... ...... ....... ...... ....... .........7
1.3 Product Description.....................................................................................7
1.3.1 Interfaces ...............................................................................................8
1.3.2 Communications Protocols ....................................................................8
CHAPTER 1
Introduction
6
April ’00 Chapter 1. Introduction
1.1 General
This document provides information about the S251B Reader. It describes the reader and how to install it.
1.2 System De scription
A TIRIS system co mprises a reader connected to a control device (us ually a host computer) via an RS2 32, or an RS422/RS485 interface, an antenna and a trans­ponder. 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 gen­erated magnetic field is stored in the capacitor in the transponder and when the pow­er pulse has finished the transponder immediately sends its data back to the reader.
1.3 Product Description
The Reader is an integral part of a TIRIS system, it provides all of the RF and control functions required to communicate with TIRIS LF transponders.
The main task of the Reader is to send a power pulse via the antenna to initialize the transponder, to demodulate the received identification signal and then send the data to a control device. It is also used to send programming data to Read/Write and Mul­tipage transponders.
The Reader is housed in an IP20 Polycarbonate box as shown Figure 1.
Figure 1: S251B Reader
If connected via an RS232 or an RS422 /RS485 inter face the comp uter send s com­mands to the reader using one of the two protocols used by the system (ASCII or TI­RIS Bus Protocol), and the reader then communicates via its antenna with any transponders within tha t antenna’s range . The antenna can be mou nted up to 5 m (depending on the antenna) away from the reader.
7
1.3.1 Interfaces
The 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 Protocols
There are two protocols that can be used with the S251B Reader, they are:
ASCII Protocol.
TIRIS Bus Protocol.
If you are using on e r ea der p er c ontr ol ling dev i ce yo u m ay ch oose the protocol that best suits your requirements. However, if you have more than one reader connected to a bus running under a contr ol ling dev i ce then yo u mus t us e the T IRIS Bus Pr oto­col.
For details regarding th ese communicatio ns protocols, please refer to the relevant manual (11-06-21-037 for the ASCII Proto col, 11-06-21- 053 for the TBP) , available at the TIRIS home page:
This is a simple protocol that you can use to send ASCII charac­ter commands to the reader. It is possible to use a standard termi­nal emulator program to send ASCII commands. The ASCII protocol can only be used with RS232 or RS422.
This is a bina ry protocol suitable for c ommunication be­tween a controllin g device (for example: a PC) a nd one or mor e readers. For exampl e with a sing le reader u sing an RS23 2 inter­face or up to 31 readers using RS422/485. The TIRIS Bus protocol can be used with RS232 or RS422/485.
http://www.tiris.com
8
Chapter 2:Hardware
This chapter describes the hardware of the S251B Reader. It tells you which modules together comprise the reader. It also describes the front panel (switches connections etc.) and specifies the electrical inputs and outputs.
Topic Page
2.1 General........................................................................................................10
2.2 Product Description...................................................................................10
2.3 Mechanical Information.............................................................................22
CHAPTER 2
Hardware
2.2.1 Connectors...........................................................................................11
2.2.1.1 A - Supply Connector..................................................................12
2.2.1.2 B - General Purpose Inputs/Outputs...........................................13
2.2.1.3 C - Synchronization Interface .....................................................14
2.2.1.4 D - Carrier Phase Synchronization Interface ..............................15
2.2.1.5 E - Open Collector & I/Os...........................................................16
2.2.1.6 F1 & F2 - RS232 Communication Interface................................17
2.2.1.7 G - RS422/RS485 Communications Interface............................18
2.2.1.8 H - Indicator Outputs...................................................................19
2.2.1.9 I - Antenna Connector.................................................................19
2.2.2 Switches...............................................................................................20
2.2.3 Indicators..............................................................................................22
2.2.4 Potentiometers.....................................................................................22
2.2.4.1 RF Power Adjustment.................................................................22
2.2.4.2 EMI / Sync. Level Adjustment.....................................................22
9
2.1 General
This chapter describes the hardware comprising the S251B Reader and provides the electrical specifications.
2.2 Product Description
The S251B Reader is contained in a IP20 polycarbonate box that enables easy inte­gration 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 mod ules assemb led toget her in a hou sing. The modules are:
Control Module
Radio Frequency Module
which contains all th e cir cu itry requi r ed to co mmu ni cat e v ia th e interface to the computer and external de vices, to provide syn­chronization, and to control the RFM. It includes a
Tuning
nance.
RIS reading unit that a re nee ded to initia lize a TIRIS transpon der and to detect its return signal.
(DAT) function to autom aticall y tune th e antenn a to reso-
(RFM) which contains all the analog functions of a TI-
10
Dynamic Auto
April ’00 Chapter 2. Hardware
2.2.1 Connectors
There 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 2­pin connector for the anten na. The function of e ach pin on each con nector (except the RS232 sub-D connector) is described in the following paragraphs. Their location is shown in Figure 3.
Figure 3
A
12
+ -
Power Fuse
123
On
Reader S251B
O.C. - I/O
16
E F1 H
In order to gain access to the fuse and co nnec to r J you mu st fi rst re mov e the upper two screws holding the front panel on, remove the plastic cover strip and then replace the two screws. To gain access to the connectors H and I you must first remove the lower two screws holding the front panel on, remove the plastic cover strip and then replace the two screws.
:
S251B Connector Locations
J
1
General Purpose Inpu t / Ou tp u t
Power Range Setting
CTL Setup
On On
1 1
B
EMI TX Active Read O.K.
RS232
16
F2
15
16
Synchronization
On
1
RF Power Output Adj.
EMI / Sync. Level Adj.
L
!
O.K.
L
RS422 / 485
16
Antenna Tuning
"
16
RS422 RS485
DAT
G
C
D
Antenna
1
I
2
The pins are not individually numbered on the connectors themselves (just on Figure 3 for your convenience).
The connectors are all marked on Figure 3 with a letter (from A to I) and are listed in Table 1 which also shows the section that describes them
Table 1: List of Connectors
Identifying Letter Function Section
A Supply Connector 2.2.1.1 B General Purpose Inputs/Outputs 2.2.1.2
C Synchronization Interface 2.2.1.3
D
Carrier Phase Synchronization
Interface
2.2.1.4
E Open Collector Inputs/Output s 2.2.1.5
F1 RS232 Connector (9-pin SEB-D) 2.2.1.6
11
Table 1: List of Connectors
Identifying Letter Function Section
F2 RS232 Connector 2.2.1.6
G RS422/RS485 Connector 2.2.1.7 H Indicator Outputs 2.2.1.8
I Antenna Connector 2.2.1.9
2.2.1.1 A - Supply Connector
The Reader requires a single DC supply voltage (10 to 24 V) through a 2-pin connec­tor marked with + for positive and – for negative
The Power Range Setting wired jumpers (marked J in Figure 3) and the actual power supply have a dir ect consequence on the operating temperature of the reader as shown in Table 2.
Table 2: Power Range Settings
Setting Input Power Operating Temperature Range
Pins 1 + 2 connected 10 - 15 V -20º to +70º C
“ 15 - 24 V
Pins 2 + 3 connected 18 - 24 V -20º to +70º C
(max. I_VSP = 0.9 A
-20º to +70º C see caution 1).
peak
CAUTION:
1. In order to operate the reader over t he full temperature range with pins 1 + 2 connected (15 to 24 V), the maximum current consumption must not exceed 0.9 A
. Exceeding this
peak
value could result in unreliable functio ning 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 t o normal oper­ation. 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, t herefore if it is incor porated 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.
1..
Table 3: Supply Connector
Pin Signal Description Direction
1 + Positive supply input 2 - Ground input
12
April ’00 Chapter 2. Hardware
Table 4: Supply Connector - Specifications
Parameter Minimum Maximum
Logic Supply Voltage VSL 10 V 24 V
Logic Supply current ISL - 2.5 A
2.2.1.2 B - General Purpose Inputs/Outputs
The Reader has ei ght general purpose TTL-Level Inputs/O utputs. By m eans of th e configuration set-up, they can be set in groups of four to be Input or Output. Further­more, 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 5: General Purpose Inputs/Outputs
Pin Signal Description Direction
1 GP IO 7 General Purpose I/O 7 Input/Output 2 GP IO 6 General Purpose I/O 6 Input/Output 3 GP IO 5 General Purpose I/O 5 Input/Output 4 GP IO 4 General Purpose I/O 4 Input/Output 5 GP IO 3 General Purpose I/O 3 Input/Output 6 GP IO 2 General Purpose I/O 2 Input/Output 7 GP IO 1 General Purpose I/O 1 Input/Output 8 GP IO 0 General Purpose I/O 0 Input/Output
9 - not connected ­10 IN1 Input 1 Input 11 IN0 Input 0 Input 12 RESET- Reset Input
13 VCC
14 GND Signal Ground ­15 GND Signal Ground -
Regulated 5 Volt dc Supply
(see note)
Output
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 Collec­tor & I/Os - pin 1) must not exceed 500 mA.
13
Table 6: General Purpose Inputs/Outputs - Specifications
Parameter Minimum Maximum
GP IO Output Voltage @ 6 mA
Low level High level
-
3.15 V
0.9 V
5.25 V
2.2.1.3 C - Synchronization Interface
The synchronization in terface is used to establish h ard wired synchronization with other readers through a single or double pair of wires. Its pin assignment is given in Table 7 and its specifications are given in Table 8.
Table 7: Synchronization Interface
Pin Signal Description Direction
1 Sync Rx+ RS422/RS4 85 non-inverted synchronization data Input 2 Sync Rx- RS422/RS485 inverted synchronization data Input 3 GND Signal ground ­4 Sync Tx+ RS422/RS485 non-inverted synchronization data Output
General Purpose IO Output Current
Low level
High level GP IO 1 to 4 total Output Current 10 mA GP IO 5 to 8 total Output Current 10 mA
Regulated 5 V Output Current 100 mA
-
-
25 mA 16 mA
5 Sync Tx- RS422/RS485 inverted synchronization data Output 6 GND Signal ground -
Table 8: Synchronization Interface - Specifications
Parameter Specification
Mode of Operation Differential
Number of Drivers On Line 32
Number of Receivers On Line 32
Maximum Cable Length 1200 m
Maximum Data Rate 10 Mbits/s
Maximum Common Mode Voltage +12 V / -7 V
Driver Voltage
Driver Load 60 mA
Driver Output Short Circuit Limit
High > +1.5 V
Low < -1.5 V
150mA to GND
250mA to VCC
14
April ’00 Chapter 2. Hardware
Table 8: Synchronization Interface - Specifications
Parameter Specification
2.2.1.4 D - Carrier Phase Synchronization Interface
The carrier phase sy nchronization interfac e is used to establish hard wired carrier phase synchronizati on with other readers throu gh a single pair of wires. Its pi n as­signment is given in Table 9 and its specifications are given in Table 10.
Table 9: Carrier Phase Synchronization Interface
Pin Signal Description Direction
1 Sync Rx+ RS422/RS4 85 non-inverted synchronization data Input 2 S ync Rx- RS422/RS485 inverted synchronization data Input 3 GND Signal ground ­4 Sync Tx+ RS422/RS485 non-inverted synchronization data Output 5 Sync Tx- RS422/RS485 inverted synchronization data Output 6 GND Signal ground -
Receiver Input 12 k
Receiver Sensitivity ±200 mV
Receiver Hysteresis 60 mV
Ω
Table 10: CPS Interface - Specifications
Parameter Specification
Mode of Operation Differential
Number of Drivers On Line 32
Number of Receivers On Line 32
Maximum Cable Length 1200 m
Maximum Data Rate 10 Mbits/s
Maximum Common Mode Voltage +12 V / -7 V
Driver Voltage
Driver Load 60 mA
Driver Output Short Circuit Limit
Receiver Input 12 k
Receiver Sensitivity ±200 mV
Receiver Hysteresis 60 mV
High > +1.5 V
Low < -1.5 V
150mA to GND
250mA to VCC
Ω
15
2.2.1.5 E - Open Collector & I/Os
This connector provid e two open collecto r connec tions to and from th e reader, plus the RXSS output (used to set the local noise level), another 5 V regulated output and an interrupt input. Its pin assignment i s given in Table 1 1 and its specifi cations are given in Table 12.
Table 11: Open Collector & I/Os
Pin Signal Description Direction
1 VCC Regulated 5 Volt dc Supply (see note 1 below) Output 2 OC1 Open collector 1 Output 3 OC0 Open collector 0 Output 4 GND Signal ground ­5 INT0 Interr upt 0 (see not e 2 below:) Inp ut 6 RXSS- RXSS Output
Notes:
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 provid­ing their own software.
Table 12: Open Collector & I/Os - Specifications
Parameter Minimum Maximum
Open Collector Voltage to GND 1.3 V 80 V
Open Collector Current 500 mA
Regulated 5 V Output 4.75 V 5.25 V
Interrupt Input 4.75 V 5.25 V
RXSS - 5.25 V
16
April ’00 Chapter 2. Hardware
2.2.1.6 F1 & F2 - RS232 Communication Interface
Depending on the DIP-Switch configuration, the Reader will either communicate via the RS232, RS422 or RS485 interface.
There are two interface connectors either of which can be used for an RS232C con­nection. They ar e: a sta nda rd RS 232 In ter fac e 9-pi n S UB -D ma le c onne ct or (F 1 o n Figure 3) and a 6-pin WEC O connector (F2 on Figur e 3). Both of th ese conne ctors allow communicatio n between th e reader and a cont rolling dev ice. The pin assign­ment for the SUB-D conn ector is given in T able 13 and the pin assignment for the WECO connector is given in Table 14.
Both, the ASCII and TIRIS Bus protocol can be used with the RS232 interface.
Table 13: RS232 SUB-D Connector
Pin Signal Description Direction
1 - Not connected ­2 TxD Transmit Data Output 3 RxD Receive Data Input 4 DTR Data Terminal Ready Input 5 GND Signal Ground ­6 DSR Data Set Ready Output 7 - Not connected ­8 - Not connected ­9 - Not connected -
Table 14: RS232 WECO Connector
Pin Signal Description Direction
1 RxD Receive Data Input 2 DTR Data Terminal Ready Input 3 GND Signal Ground ­4 TxD Transmit Data Output 5 DSR Data Set Ready Output 6 GND Signal Ground -
All interface parameter s are acc ordi ng to the RS2 32 s pec if ic ation and are not given in detail in this manual . The DTR a nd DSR line s are curre ntly not us ed for any pur­pose.
17
2.2.1.7 G - RS422/RS485 Communications Interface
Depending on the DIP-Switch configuration, th e Reader will communicate via the RS232, RS422 or RS485 interf ace. RS422/4 85 conne ct ions are mad e via the 6-pi n WECO connector (G in Figure 3). Its pin assignment is given in Table 15 and its spec­ifications 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 RS485
interface.
Table 15: RS422/RS485 Connector
Pin Signal Description
1Rx+/Tx+
2 Rx-/Tx-
3 GND Signal Ground - -
4Tx+
5 Tx- RS422 inverted data
6 GND Signal Ground - -
RS422/RS485 non-
inverted data
RS422/RS485
inverted data
RS422 non-inverted
data
Direction
RS422
Input Input/Output
Input Input/Output
Output/High
Impedance
Output/High
Impedance
Table 16: RS422/RS485 Communications Interface - Specifications
Parameter Specification
Mode of Operation Differential
Number of Drivers On Line 32
Number of Receivers On Line 32
Direction
RS485
-
-
Maximum Cable Length 1200 m
Maximum Data Rate 10 Mbits/s
Maximum Common Mode Voltage +12 V / -7 V
Driver Vo ltage
Driver Load 60 mA
Driver Output Short Circuit Limit
Receiver Input 12 k
Receiver Sensitivity ±200 mV
Receiver Hysteresis 60 mV
High > +1.5 V
Low < -1.5 V
150mA to GND
250mA to VCC
Ω
18
April ’00 Chapter 2. Hardware
2.2.1.8 H - Indicator Outputs
This connector (H in Figure 3) is a 2 x 3-pin (double row) pin header connection which provides the LED output signals. Its pin assignment is given in Table 17 and its spec­ifications are given in Table 18.
Table 17: Indicator Outputs
Pin Signal Description Direction
1 ACTIVE Open collector output: RF Module transmitter signal Output 2 3 O.K. Open collector output: O.K. signal Output 4
5 RXSA
6 GND Signal ground -
Table 18: Indicator Outputs - Specifications
Maximum voltage at current limiti ng 270 Ω resistor - 5 V
2.2.1.9 I - Antenna Connector
The antenna must be connected to the reader via the antenna terminals. The pin as­signment for the antenna connector is given in Table 19. If a custom designed anten­na is used, it must be within the specifications defined in Table 20 in order to ensure that the dynamic autotuning facility functions correctly.
V
R270
V
R270
Receiver signal strength output voltage (RXSA) 0.7 V 1.7 V
Current limited output: (270 Ω in series to VCC) Output
Current limited output (270 Ω in series to VCC) Output
Receiver signal strength adjust output to monitor the
receiver signal strength threshold level
Parameter Minimum Maximum
Open Collector (voltage ) - 10 V Open Collector (current) - 80 mA
Output
Table 19: Antenna
Pin Signal Description
1 ANT Tx/Rx antenna 2 ANT Tx/Rx antenna
Table 20: Antenna - Specifications
Parameter Minimum Maximum
Antenna Resonance Voltage - 380 Vpeak
Antenna Inductance 26.0 µH 27.9 µH
Antenna Q-factor 40 350
19
2.2.2 Switches
There are three banks of DIP swi tc hes on the S 251 B Rea der , on e is for the Control Module 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 Module set-up switches are l isted in Ta ble 21, the R S422/RS485 /DAT settin gs are lis ted in Table 23, and the synchronization settings switches are listed in Table 24. The ON position and switch 1 are always shown in the switch bank, the switch is on when the switch is set to the up position.
Figure 4: CTL Setup Switches
ON
1
Table 21: CTL Setup DIP Switches
Switch OFF ON
1 RAM - VCC -
2
3 Reserved for Software Development
4
5 PSEN Reserved for Software Development 6 See Table 22 7 See Table 22 8 TIRIS Standard Configuration Customer Specific Configuration
9 Reserved 10 Reserved 11 TXCT-ON * 12 Not Connected
Chip Select ROM for TIRIS
Standard Firmware
Chip Select RAM for TIRIS Standard
Firmware
Reserved for Software Development
Chip Select RAM for TIRIS Standard
Firmware
Reserved for Software Development
* When this swi tch (1 1) is swi tched either f rom O N-to -OFF o r from OFF-to-
ON the reader’s transmitter is activated for 10 seconds.
Table 22: I/O Setting Switches (6 & 7)
SW6 SW7 Comment
OFF OFF No effect
ON ON/OFF Reset reader by switching RS232 DTR line
OFF ON Can be used by customer firmware for hardware handshake
20
April ’00 Chapter 2. Hardware
Figure 5: RS422/RS485/DAT Switches
ON
1
Table 23: RS422/RS485/DAT Settings DIP Switches
Switch OFF ON
1 RS422 RS485 2 RS422 RS485
3-
4 DAT Disabled DAT Enabled 5 DAT LEDs Disabled DAT LEDs Enabled
RS422/RS485 Rx+/Rx-
line-to-line termination (120 Ω)
Notes:
SW1 and SW2 must always be in the same position as each other, either both OFF or both ON.
Figure 6: Synchronization DIP Switches
ON
1
Table 24: Synchronization DIP Switches
Switch OFF ON
1 - Synchronization Rx+ line pull-up (180 Ω) 2 - Synchronization Rx- line pull-down (180 Ω)
3-
4 Set the RFM to Master Set the RFM to Slave in CPS Bus 5 - CPS line-to-line termination (120 Ω)
RS422/RS485 Rx+/Rx- line-to-line
termination (120 Ω)
21
2.2.3 Indicators
There are six LEDs on the front panel of the reader they are described in Table 25
Table 25: Indicators
Indicator Description
TX Active Indicates activation of the RF transmitter
Read O.K. Indicates a response from a valid transponder
Antenna
Tuning
The TX Active and Re ad O.K. L ED lines are a lso made avail able for external use if required, details are given in section 4.7.
2.2.4 Potentiometers
There are two pote ntiometers that c an be adjusted t hrough the reader front panel, they are: the RF Power Output ad justment potentiometer (2.2.4.1) and the EMI / Sync. Level adjustment potentiometer (2.2.4.2).
2.2.4.1 RF Power Adjustment
EMI Indicates the presence of Electro Magnetic interference
L
O.K. The DAT has tuned the antenna to maximum resonance voltage
L
Antenna out of tune, inductance too high
↑
Antenna out of tune, inductance too low
↓
.
The potentiometer ca n be us ed to adj us t the int er nal os ci ll ato r puls e width and thus the generated antenna voltage/field strength. Turning th e potentiometer clockwise causes the field strength to be increased.
2.2.4.2 EMI / Sync. Level Adjustment
This potentiometer allows the receiver signal strength threshold level to be adjusted for wireless synchronization. Turning the potentiometer clockwise results in maxi­mum sensitivity.
There is one fuse on the S251B that is: 2A Slow-blow. If the fuse should blow, replace it with the replacement fuse supplied with your reader.
2.3 Mechanical Information
The mechanical dimensions and weight are given in Table 26.
Table 26: Mechanical Information
Parameter Value
Height 120 mm
Width 120 mm
Length 200mm
22
Weight 900 g
Chapter 3:Synchronization
If you are using more than one re ader in an ap plicat ion, it may mean th at you need to synchronize their operation so that they do not interfere with each other. This chapter describes the various synchronization options.
Topic Page
3.1 Introduction................................................................................................24
3.2 Types of Synchronization .........................................................................24
3.2.1 No Synchronization...................................... ....... ...... ....... ...... ....... ...... .24
3.2.2 Wireless Synchronization.....................................................................25
3.2.3 Wired Synchronization ..................................................... ...... ....... ...... .2 5
3.2.4 Combined Wireless/Wired Synchronization.........................................25
3.2.5 Master/Slave Synchronization..............................................................26
3.2.5.1 M/S Synchronization without Acknowledgement........................26
3.2.5.2 M/S Synchronization with Acknowledgement.............................26
3.2.5.3 Triggered Synchronization..........................................................27
3.2.6 Carrier Phase Synchronizati on ............................................................2 7
CHAPTER 3
Synchronization
23
3.1 Introduction
Where multiple readers are operating in the same area, it is necessary to coordinate the activities of those readers to avoid mutual interference. This is known as synchro­nization. Synchroniz ation in this context m eans that the reade rs in your applic ation are controlled in such a way that they do not interfere with each other.
There are several typ es of synchr onizati on that can be use d dependi ng on the situ­ation in a particular application, for example: the type of transponder, the type of op­eration performe d on that transponder ( Charge-only read, General read, Program page, Lock page), th e size of the an tennas and the s peed of the tr ansponder. The different kinds of sy nchronizatio n are describe d in section 3.2 . How to actually set­up your system to u se th e sy nc hr on iz at i on yo u’ ve chosen is describe d to ge th er wit h the other installation procedures in Chapter 5.
The distance that readers’ antennas have to be separated before the need for some method of synchr oni za tio n i s r equ ir ed, v arie s with l ocal c ond iti ons , for i n addi ti on to purely airborne (radiated) interference, signals can travel from one reader to another via metal structures (conducted). Metal structures can include the frames of metal buildings, reinforcing bars in concrete floors and power or data cables.
3.2 Types of Synchronization
The S251B Reader can be configured to synchronize in a number of different ways:
No Synchronization (3.2.1) Wireless Synchronizati on (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 Synchronization
This option is only us ed in conjunction w ith Software synchro nization, or if th ere is only a single reader. No sync. and Master/Slave sync without acknowledgement are the fastest methods of reading transponders.
If all readers are connected by the same RS485 data netwo rk, coordination of the readers can be controlled directly by the Host Computer. For example, the Host Computer may issue a Broadcast command for all readers to simultaneously perform a read cycle and buffer the result. Another technique possible using the data network is to issue individual commands to each reader in turn. This technique is used when writing data to Multipag e Transponders (MPTs). Where a PLC has a num ber of point-to-point connec tions to readers, it is also possible to coo rdinate the activities via the ladder logic. With Software synchronization all readers will be simultaneously transmitting or, each reader individually operating. In both cases the readers can be configured to have No Synchroniz ation.
24
April ’00 Chapter 3. Synchronization
3.2.2 Wireless Synchronization
Wireless synchroni zation can be used to control the coordination of readers, with standard antennas, pr ovided the electrical noise in the env ironment is low for the type 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 re ader and “backs-off” for a set per iod before com­mencing its own cycle. Wireless synchronized readers can read together or alternately.
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 syn­chronization).
Disadvantages:
1. I n noisy environmen ts, there is too m uch sensitivity wi th larger antennas (G04 and larger custo m antennas) to allow accurat e setting of the back­ground 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 transpond­ers.
4. Whe re the environmenta l conditions change, for ex ample: a ground loop antenna’s char acteristics are ch anged by a vehicle over it , the synch roni­zation adjustment could be wrong.
3.2.3 Wired Synchronization
Wired Synchroniz ation works in th e sam e way as wir eles s sync hroniz ation with th e exception that the reader obtains its information about the presence of another read­er 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 transpond­ers.
3. If the power fails at any of the readers the bus fails.
3.2.4 Combined Wireless/Wired Synchronization
When this option is selected, groups of reader connected by the wired synchroniza­tion cabling can sync hroniz e with other grou ps of wire d synchro nizati on re aders, or with individual readers, by using wireless synchronization.
The advantages an d disadvantag es of both wire less and wired synchronizat ion as given above still apply.
25
3.2.5 Master/Slave Synchronization
Master/Slave Synchronization is probably the most commonly used form of synchro­nization. One reader is configured to be the the other readers, which are configured as
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 synchro nization is the fastest me thod of reading transpond ers and was originally deve loped for readi ng tagged veh icles at speed . It assumes that all readers are on the same synchroni zatio n bus and the read ers would no t, for exam­ple, recognise a handhel d reader th at is tryin g (probab ly uns uccess fully) to perform a reading.
Advantages:
1. Uses a singl e twis ted pair ca ble .
2. Has the fastest read rate.
3. The Master can be used for Charge-only read or Write/Program.
Master
Slaves
and this reader then controls all
.
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 exactl y the same RF-Task as the Master (read the same 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 trans­ponder and the master doesn’t, the slave may miss the next pulse while it is process­ing the reading from that transponde r. In Master/Slave with Acknowledg ement the Master has to wait until all slaves have completed their current cycle before initiating the next cycle. This is achieved by using a 4 wire synchronization bus (twin twisted pair) with the slave transmit lines coupled back to the Master receive lines.
This method has the following advantages over Master/Slave without Acknowledge
1. 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 pos­sibility of corr upted data. This re striction also in cludes the paged read of multipage transpon ders .
26
April ’00 Chapter 3. Synchronization
3.2.5.3 Triggered Synchronization
Triggered Synchron izatio n is a Master/Sl ave Sync hroni zation Bus where there i s just a pulse signal. All readers are configured as masters, but it is only one unit or a trig­ger pulse source that issues the synchronization pulse at suitable intervals for the re­quired operations on the transponder.
The more complex version of this is known as a Timing Bus, when different time win­dows are defined for different o perations to be carried out, for example: If m ultiple readers are require d to read addressed pages of Mul tipage transponders, then to write data back to the transponders, the timing bus would start a read window lasting 90 ms then initiate a time window of 320 ms for a write operation. In this way the dif­fering times required for the two operations can be accommodated. At the same time the readers would be instructed thru the communication interface, about which com­mand to execute durin g each window. Therefore the slaves have to receive their command before the master.
Advantages:
1. The master unit has total control over the coordination of the connected de­vices and can allow ‘windows’ for particular operations.
2. Reading and Writing can be accommodated, if there is sufficient separation to prevent data corruption during the Write process.
Disadvantages:
1. C annot be used for address ing MP transponders if readers are close to­gether 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 each other. In these circumstanc e, the magnetic charge-up fie lds generated by different antennas superimpo se on ea ch othe r a nd m ay ca use a beat effect on the magnetic charge-up field, due to the slightl y different tra nsmission pha ses of differ ent Power readers. This ef fect will not occur when t he tran smitt ers o f differen t read ers a re op­erated from the same oscillator signal.
This is Carrier Ph ase Synch ronization where al l of the re aders in a system use the same oscillator. Carrier Phase synchronization must be used whenever Gate or Stick antennas are facing each other and if they are inside the distances D1 or D2 as given in Table 27 (Figur e 7 shows the places to measure D1 and D2). T his ensur es that there 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.
27
Figure 7: Distance between Antennas (top view)
Table 27: Distances Between Antennas
Antenna type
RI_ANT_S02 <=> RI_ANT_S02 0.8 1.0 RI_ANT_G01 <=> RI_ANT_G01 1.7 1.5 RI_ANT_G02 <=> RI_ANT_G02 1.3 1.0 RI_ANT_G04 <=> RI_ANT_G04 2.0 1.7
Distance D1
[m]
Distance D2
[m]
28
Chapter 4:Installation
This chapter provides you with the inform ation that you need to kno w in order to in­stall the reader.
This chapter also describes how to incorporate the various synchronization options.
Topic Page
4.1 Introduction................................................................................................30
4.2 General........................................................................................................30
4.3 Mechanical Mounting.................................................................................30
4.3.1 Power Supply.......................................................................................30
CHAPTER 4
Installation
4.4 Communication..........................................................................................31
4.4.1 Configuration........................................................................................31
4.4.2 RS232 ..................................................................................................31
4.4.2.1 Activation ....................................................................................32
4.4.3 RS422 ..................................................................................................32
4.4.4 RS485 ..................................................................................................33
4.5 Synchronization .........................................................................................34
4.5.1 Software Controlled..............................................................................34
4.5.2 Wireless Synchronization.....................................................................34
4.5.3 Wired and Combined Wireless/Wired Synchronization........................34
4.5.4 Master/Slave (without acknowledgement) & Triggered Synch.............35
4.5.5 Master/Slave (with acknowledgement) ................................................36
4.5.6 Transmitter Carrier Phase Synchronisation (CPS) ..............................37
4.6 General Purpose Input/Outputs................................................................38
4.7 LED Outputs ...............................................................................................39
4.8 Reset ...........................................................................................................39
4.9 Antenna.......................................................................................................40
4.10 RF Power Output Adjustment...................................................................40
4.11 EMI / Sync. Level Adjustment...................................................................40
29
4.1 Introduction
Note:
Always ensure that the reader is switched off when making or break­ing connections to it.
4.2 General
The S251B Reader has been des igned with easy in stalla tion in mind . The foll owing information provides you with any details such as switch settings and so on that you will need to know.
4.3 Mechanical Mounting
a. 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.
or
b. If you are mounting the reader onto a wall where there is No vibration, snap in
the four mounting adapters and screw the reader to the wall using M4 screws.
or
c. If you are mounting it onto a wall where it may be subject to vibration, open the
reader, drill thru the marke d mounting ho les and screw the reader to the wal l using M4 screws and the appropriate washers.
4.3.1 Power Supply
WARNING:
ARE MUST BE TAKEN WHEN HANDLING THE
C VOLTAGE
HARMFUL TO YOUR HEALTH DAMAGED THE ANTENNA SHOULD NOT BE CONNECTED TO THE
ACROSS THE ANTENNA TERMINALS COULD BE
THE ANTENNA INSULATION IS
. IF
S251B. HIGH
S251B.
Connect a Regulated dc power supply (betwee n 10 and 24 V pr oviding a min imum of 2A) to the reader - the polarity of the connection is shown on the front panel of the reader.
Set the Power Range Setting wire bridge to match your input voltage (see Table 2). We recommend that you use a linear power s upply. If this is not possi ble and you
wish to use a switched m ode power supply , DO NOT use one that operates below 200 kHz. (switched mode power supplies that operate below 200 kHz. might interfere with transponder signals and thus reduce the reading range).
30
April ’00 Chapter 4. Installation
4.4 Communication
Follow the instruc tions given i n the sectio n that descr ibes the commun ications s et­up that you have decided to use in your system: Section 4.4.2 for RS232, Section
4.4.3 for RS422 and Section 4.4.4 for RS485.
4.4.1 Configuration
CTL Setup switch 8 determines the mode of operation of the contr ol module when power is applied to the con tr ol mod ule . W hen CT L Se tu p sw itch 8 is in the OFF po­sition, standard TIRIS default parameters are used, these are:
- ASCII protocol
- 9600 baud, eight databits, no parity, one stop bit, X
- 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 RS232C
If CTL Setup switch 8 is in the ON p osition, custo mer s pecifi c parame ters are use d to operate the Control Modul e. These applic ation specific par ameters are stored in the serial EEPROM on the Control Module.
on/Xoff
enabled
4.4.2 RS232
Note:
The setting of CTL Setup switch 8 is only checked after power on.
You can use the Sof tware Utility Progr am which is availabl e on the internet at our site:
http://www.tiris.com
to configure your reader.
In order to confi gure the reader for cus tome r s pecifi c pa ra met ers yo u m us t c on nec t the reader via the RS232 por t (c onn ect or F1 or F2) t o yo ur hos t and get c on nec tio n using the TIRIS sta ndard paramet ers (with CT L Setup switch 8 is in the OFF posi­tion). Change the defau lt p ar ame ters to t he c ustom er s pecifi c param ete rs an d sav e them. Set CTL Setup switch 8 to the ON position and re set the reader. The rea der will then work with the customer specific parameters.
Either connect a 9-pin SUB-D female plug to the SUB-D connector, or connect up the 6-pin WECO connector mar ked “RS 23 2” on the rea der ’s front pa nel , the pi n s ignals are given in Table 28 or Table 29.
Table 28: RS232 9-pin Connector
Pin Signal Description Direction
1 - Not connected ­2 TxD Transmit Data Output 3 RxD Receive Data Input 4 DTR Data Terminal Ready Input
31
Table 28: RS232 9-pin Connector
Pin Signal Description Direction
5 GND Signal Ground ­6 DSR Data Set Ready Output 7 - Not connected ­8 - Not connected ­9 - Not connected -
Table 29: RS232 WECO Connector
Pin Signal Description Direction
1 RxD Receive Data Input 2 DTR Data Terminal Ready Input 3 GND Signal Ground ­4 TxD Transmit Data Output
4.4.2.1 Activation
4.4.3 RS422
5 DSR Data Set Ready Output 6 GND Signal Ground -
The Data Terminal Ready signal (DTR) is connected to the reset/watchdog circuit of the S251B Reader. This ensures a PC controlled microcomputer initialization before the default Read Mode is started.
When power is applied to the reader the Data Set Ready signal (DSR) of the RS232­C interface is activated.
Connect the WECO (marked RS422 / 485) connector as shown in Table 30. Set the switches as sho wn in Figure 8. If you are only using o ne reader the line terminal switch 3 must be switched to ON, if you are using more than one reader only the last reader in the line must be switched to ON (all other readers to OFF).
32
April ’00 Chapter 4. Installation
Figure 8: Switch Settings for RS422
ON
1
Table 30: RS422/RS485 Connector
4.4.4 RS485
Pin Signal Description
1Rx+/Tx+
2 Rx-/Tx-
3 GND Signal Ground - -
4Tx+
5 Tx- RS422 inverted data
6 GND Signal Ground - -
RS422/RS485 non-
inverted data
RS422/RS485
inverted data
RS422 non-inverted
data
Direction
RS422
Input Input/Output
Input Input/Output
Output/High
Impedance
Output/High
Impedance
Direction
RS485
-
-
Connect the WECO (marked RS422 / 485) connector as shown in Table 30. Set the switches as sho wn in Figure 9. If you are only using o ne reader the line terminal switch 3 must be switched to ON, if you are using more than one reader only the last reader in the line must be switched to ON (all other readers to OFF).
Figure 9: Switch Settings for RS485
ON
1
33
4.5 Synchronization
4.5.1 Software Controlled
There is no special wiring requ ired for this type of synch ronization. Make su re that you set the software configuration to No Sync. when you are configuring the reader.
4.5.2 Wireless Synchronization
There are no switch or jumper settings for wireless synchronization. Make sure that you set the software configuration to wir ele ss s yn ch roni za tio n whe n y ou are c onf ig­uring the reader.
4.5.3 Wired and Combined Wireless/Wired Synchronization
Figure 10 shows in which way the S251B Reader must be connected for a wired and a combined wireless/wired synchronization. Make sure that you set the software con­figuration to match when yo u are c onfigu ring the read er. Ta ble 31 expl ains th e set­ting of the Synchronization DIP switches 1, 2 & 3.
Figure 10: Wired & Combined Wireless/Wired Sync. Interface Connection
Table 31: Wired and Combined Wireless/Wired Synchronization
Line
Termination
Dip Switch
SW1 ON OFF ON SW2 ON OFF ON SW3 ON OFF ON (see Note)
UNIT 1: UNIT 2...UNIT n-1: UNIT n:
Note:
If the distance between Unit 1 and Unit n is less than approximately 400 m, DIP switch SW3 can be left OFF.
34
April ’00 Chapter 4. Installation
4.5.4 Master/Slave (without acknowledgement) & Triggered Synch.
Figure 11 shows the way that the Readers have to be connected for mast er/slave synchroniz ati on wi tho ut a ckno wledg men t; a nd t rig gere d sy nchr oniz ati on. Ma ke sur e that you set the software configuration to Master or Slave (according to Table 32 and Table 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 Acknowledgement
Line Termination
Dip Switch
SW1 ON OFF ON SW2 ON OFF ON SW3 OFF OFF ON (see Note)
Unit 1:
(Master)
Unit 2...Unit n-1:
(Slaves)
UNIT n: (Slave)
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 Synchronization
Line
Termination
Dip Switch
SW1 Termination not required OFF ON SW2 Termination not required OFF ON SW3 Termination not required OFF ON (see Note)
UNIT 1:
Trigger Unit
UNIT 2...UNIT n-1:
(Master)
UNIT n: (Master)
35
4.5.5 Master/Slave (with acknowledgement)
Figure 12 shows the way that the Readers have to be connected for mast er/slave synchronization with acknowledgement. Make sure that you set the software configuration to Master or Sla ve (according to Table 34) when y ou are configur ing the 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 Acknowledgement
Line Termination
Dip Switch
SW1 ON OFF ON
SW2 ON OFF ON
Unit 1: (Master)
Unit 2...Unit n-1:
(Slaves)
UNIT n: (Slave)
SW3 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.
36
April ’00 Chapter 4. Installation
4.5.6 Transmitter Carrier Phase Synchronisation (CPS)
To allow you to overcome the beat effect, the pulse width modulated oscillator signal is accessible at the CPS connector D. All readers to be driven by one oscillator must have their CPS connectors connected together as shown in Figure 13.
DIP switch Synchroniz ation-SW4 determines whether the internal oscillator or the external 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 Syn chronization-SW4 is ON, the external oscillator sign al is used and the reader is referred to as an oscillator SLAVE.
Note:
Only one oscillator MASTER is allowed per synchronized system.
Figure 13: Carrier Phase Synchronisation Interface Connection
to other units
Master Slave
If you are using carrier phase synchroni zation you must confi gure your system to Master/Slave in order to have one common master.
37
4.6 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 Table
35.
Table 35: General Purpose Inputs/Outputs
I/O I/O
0 1 2 3 4 5 6 7
I I I I I I I I
I I I I O O O O O O O O I I I I O O O O O O O O
I = Input; O = Output
38
April ’00 Chapter 4. Installation
4.7 LED Outputs
The signals used for the indicator LEDs (Read O .K . an d T rans mi tti ng) ar e a va ilabl e at Indicator Outputs connector (H), they can be used to drive external LEDs or buzz­ers, they must be connected as shown in Figure 14. Ensure that the values given Ta­ble 18 are not exceeded.
Figure 14: Connecting the LED Outputs
4.8 Reset
The S251B Reader provides a connection for an external reset on pin 12 of the Gen­eral Purpose Input / O utput connector (B). Thi s pin can be used reset the S 251B Reader externally. You can a pply an external reset to the reader by connecting a push-button to the connectors as shown in Figure 15.
Figure 15: RESET Push-button Wiring
12
GND
15
RESET-
GENERAL I/O PORT
39
4.9 Antenna
The S251B Reader can be used together with the TIRIS antennas RI-ANT-G01E, RI­ANT-G02E, RI-ANT-G04E and RI-ANT-S02C. If you wish to use it with your own de­sign antenna that antenna must conform to the specifications given in Table 36.
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.
Table 36: Antenna Specifications
Parameter Minimum Maximum
Antenna Resonance Voltage - 380 Vpeak
Antenna Inductance 26.0 µH 27.9 µH
Antenna Q-factor 40 350
The antenna must be connected to the terminals marked Antenna on the S251B.
4.10 RF Power Output Adjustment
Use the RF Power Output Adj. potentiometer to ad just the internal oscilla tor pulse width and subsequently the anten na output voltag e to conf orm to your loca l regula­tions. Turning the potentiometer clockwise causes the field strength to increase.
4.1 1 EMI / Sync. Level Adjustment
EMI / Sync. Level Adj. potentiometer to adjust the receiver signal strength threshold for the wireless synchr onization. Turning the potentiometer clockw ise results in a maximum sensitivity.
If wireless synchronization is used, it is important that the EMI/Sync level Adj. poten­tiometer is correct ly adjus ted. This is one of the fin al adj ustmen ts to the reader an d is done on site in the fin al lo catio n on ce the antenn a has been tu ned an d ALL THE OTHER READER ARE SWITCHED OFF.
Turning the poten tiometer ad justs the receiver s ignal lev el threshol d and you must set the reader’s ‘b ase level n oise’ in its final lo catio n, so that an y signal l arger tha n the base level triggers the synchronization algorithm.
Send a single ‘X ’ ( ex ecu t e c omm and ) to the reader to stop any continuous rea din g, and then turn the potentiom eter cl oc k wis e until th e yel lo w LED is fully li t. Slowly ad­just the potentiometer back until the LED just goes out. Adjustment is then complete.
40
Warnings, Cautions and Notices
Chapter 5: Warnings, Cautions and Notices
This chapter provides th e Warnings, Cautions and Notic es that are relevant to the S251B reader.
Topic Page
5.1 FCC/PTT Regulations ................................................................................42
5.2 Important note to Purchasers/Users of the S251B Reader in the U.S.A.42
5.3 WARNING....................................................................................................42
CHAPTER 5
41
5.1 FCC/PTT Regulations
The TIRIS Reader RF produces emissions at 134.2 kHz. The radiation of the funda­mental and the harmonic s will vary with the type of antenna and ot her devices or functions connected to the Reader.
Prior to operating the S251B Reader together with antenna(s) and power supply, the required FCC, PTT or relevant government agency approvals must be ob­tained.Sale, lease or operation in some countries may be subject to prior approval by the 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 other­wise market the Reader in the United States. In order to form a functioning radio fre­quency (RF) device, the Reader must be connected to a suitable antenna and power supply. A radio frequency device may not be operated unless authorized by the FCC nor may a radio frequency device be marketed (i.e. sold, leased, imported, or adver­tised 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 FCC may grant the user an exper imental lic ense; se cond, the FCC may i ssue an equ ip­ment authorization pe rmitting use of th e RF device on an unli censed basis. TI ca n assist the user in obtaining an experimental license that will cover a specific installa­tion of the S251B Reader in a specific site or si tes. Exper imen tal authori zation s are appropriate to cove r o perat ions during the developm ent o f an R F d ev ice. A grant of equipment authorizati on (known as "certification") must be obtained from the FCC before RF devices are marketed or operated on a non development basis.
5.3 WARNING
DEVICES CONSTRUCTED FOR EVALUATION INCORPORATING THIS Reader SHOULD BE OPERATED ONLY UNDER AN EXPERIMENTAL LICENSE ISSUED BY THE FCC AND MAY NOT BE MARKETED. BEFORE ANY DE VICE CONTAIN­ING THIS Reader IS MARKETED, AN EQUIPMENT AUTHORIZATION FOR THE DEVICE MUST BE OBTAINED FROM THE FCC.
Prospective marketer s of devi ce s co ntai ni ng thi s Reader are responsible for obtain­ing the necessary equipment authorization. Upon request TI can provide assistance in obtaining FCC approval to market devices incorporating this Reader.
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 Reader.
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