Texas Instruments S251B Tiris Reader System User Manual

Download:
Mirror Download [FCC.gov]
Document ID	161171
Application ID	fHiEL5ATbBoS7vdG1prBpQ==
Document Description	User Manual
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	55.88kB (698452 bits)
Date Submitted	2001-07-23 00:00:00
Date Available	2001-07-23 00:00:00
Creation Date	2000-04-27 16:00:21
Producing Software	Acrobat Distiller 4.0 for Windows
Document Lastmod	2001-07-12 10:13:35
Document Title	User Manual

FCC ID: A92S251B
April ’00
Preface
Series 2000 Reader System
Reader S251B
RI-STU-251B
Reference Guide
11-06-21-054
April 2000
S2510 Reader - Reference Guide
April ’00
Edition One - April 2000
This is the first edition of this manual, it describes the following equipment:
TIRIS Reader S251B
RI-STU-251B
Texas Instruments (TI) reserves the right to make changes to its products or services
or to discontinue any product or service at any time without notice. TI provides customer assistance in various technical areas, but does not have full access 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 products. In addition, TI assumes no liability and is not responsible for
infringement of patents and/or any other intellectual or industrial property 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 any other life critical applications which could involve potential risk of death, personal injury or severe property or environmental damage.
The TIRIS logo and the word TIRIS are registered trademarks of Texas Instruments
Incorporated.
Copyright  2000 Texas Instruments Incorporated (TI)
This document may be downloaded onto a computer, stored and duplicated as necessary to support the use of the related TI products. Any other type of duplication,
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.
PREFACE
Read This First
About This Guide
This 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 in
Chapter 5.
Conventions
WARNING:
A WARNING IS USED WHERE CARE MUST BE TAKEN, OR A CERTAIN
PROCEDURE MUST BE FOLLOWED IN ORDER TO PREVENT INJURY
OR 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 software easier
If You Need Assistance
Application Centers are located in Europe, North and South America, the Far East
and Australia to provide direct support. For more information, please contact your
nearest TIRIS Sales and Application Center. The contact addresses can be found on
our home page:
http://www.tiris.com
S2510 Reader - Reference Guide
April ’00
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
Page
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
April ’00
Preface
List of Tables
Page
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
CHAPTER 1
Introduction
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
April ’00
1.1
Chapter 1. Introduction
General
This document provides information about the S251B Reader. It describes the reader
and how to install it.
1.2
System Description
A TIRIS system comprises a reader connected to a control device (usually a host
computer) via an RS232, 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 interface the computer sends 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 that antenna’s range. The antenna can be mounted up to 5 m
(depending on the antenna) away from the reader.
S2510 Reader - Reference Guide
1.3.1
April ’00
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. 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.
TIRIS Bus Protocol. This is a binary protocol suitable for communication between a controlling device (for example: a PC) and one or more
readers. For example with a single reader using an RS232 interface or up to 31 readers using RS422/485. The TIRIS Bus protocol
can be used with RS232 or RS422/485.
If you are using one reader per controlling device you may choose the protocol that
best suits your requirements. However, if you have more than one reader connected
to a bus running under a controlling device then you must use the TIRIS Bus Protocol.
For details regarding these communications protocols, please refer to the relevant
manual (11-06-21-037 for the ASCII Protocol, 11-06-21-053 for the TBP), available
at the TIRIS home page: http://www.tiris.com
CHAPTER 2
Hardware
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
2.2.1 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
2.3 Mechanical Information .............................................................................22
S2510 Reader - Reference Guide
2.1
April ’00
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 modules assembled together in a housing. The modules
are:
Control Module which contains all the circuitry required to communicate via the
interface to the computer and external devices, to provide synchronization, and to control the RFM. It includes a Dynamic Auto
Tuning (DAT) function to automatically tune the antenna to resonance.
Radio Frequency Module (RFM) which contains all the analog functions of a TIRIS reading unit that are needed to initialize a TIRIS transponder
and to detect its return signal.
10
April ’00
2.2.1
Chapter 2. Hardware
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 antenna. The function of each pin on each connector (except
the RS232 sub-D connector) is described in the following paragraphs. Their location
is shown in Figure 3.
Figure 3: S251B Connector Locations
15
1 2 3
Power + -
Fuse
General Purpose Input / Output
Synchronization
Power Range Setting
On
On
RF Power Output Adj.
EMI / Sync. Level Adj.
Reader S251B
CTL Setup
EMI
L !
TX Active
O.K.
Read O.K.
L "
Antenna
Tuning
On
On
O.C. - I/O
RS422
RS485
DAT
RS422 / 485
RS232
Antenna
F1
F2
In order to gain access to the fuse and connector J you must first remove 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.
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
Supply Connector
2.2.1.1
General Purpose Inputs/Outputs
2.2.1.2
Synchronization Interface
2.2.1.3
Carrier Phase Synchronization
Interface
2.2.1.4
Open Collector Inputs/Outputs
2.2.1.5
F1
RS232 Connector (9-pin SEB-D)
2.2.1.6
11
S2510 Reader - Reference Guide
April ’00
Table 1: List of Connectors
2.2.1.1
Identifying Letter
Function
Section
F2
RS232 Connector
2.2.1.6
RS422/RS485 Connector
2.2.1.7
Indicator Outputs
2.2.1.8
Antenna Connector
2.2.1.9
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 direct 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
-20º to +70º C
(max. I_VSP = 0.9 Apeak see caution 1).
Pins 2 + 3 connected
18 - 24 V
-20º to +70º C
CAUTION:
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 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, 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.
1..
Table 3: Supply Connector
Pin
Signal
Description
Direction
Positive supply
input
Ground
input
12
April ’00
Chapter 2. Hardware
Table 4: Supply Connector - Specifications
2.2.1.2
Parameter
Minimum
Maximum
Logic Supply Voltage VSL
10 V
24 V
Logic Supply current ISL
2.5 A
B - General Purpose Inputs/Outputs
The Reader has eight general purpose TTL-Level Inputs/Outputs. By means of the
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
GP IO 7
General Purpose I/O 7
Input/Output
GP IO 6
General Purpose I/O 6
Input/Output
GP IO 5
General Purpose I/O 5
Input/Output
GP IO 4
General Purpose I/O 4
Input/Output
GP IO 3
General Purpose I/O 3
Input/Output
GP IO 2
General Purpose I/O 2
Input/Output
GP IO 1
General Purpose I/O 1
Input/Output
GP IO 0
General Purpose I/O 0
Input/Output
not connected
10
IN1
Input 1
Input
11
IN0
Input 0
Input
12
RESET-
Reset
Input
13
VCC
Regulated 5 Volt dc Supply
(see note)
Output
14
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 Collector & I/Os - pin 1) must not exceed 500 mA.
13
S2510 Reader - Reference Guide
April ’00
Table 6: General Purpose Inputs/Outputs - Specifications
2.2.1.3
Parameter
Minimum
Maximum
GP IO Output Voltage @ 6 mA
Low level
High level
3.15 V
0.9 V
5.25 V
General Purpose IO Output Current
Low level
High level
25 mA
16 mA
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
C - Synchronization Interface
The synchronization interface is used to establish hard 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
Sync Rx+
RS422/RS485 non-inverted synchronization data
Input
Sync Rx-
RS422/RS485 inverted synchronization data
Input
GND
Signal ground
Sync Tx+
RS422/RS485 non-inverted synchronization data
Output
Sync Tx-
RS422/RS485 inverted synchronization data
Output
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
High > +1.5 V
Low < -1.5 V
Driver Load
60 mA
Driver Output Short Circuit Limit
150mA to GND
250mA to VCC
14
April ’00
Chapter 2. Hardware
Table 8: Synchronization Interface - Specifications
2.2.1.4
Parameter
Specification
Receiver Input
12 kΩ
Receiver Sensitivity
±200 mV
Receiver Hysteresis
60 mV
D - Carrier Phase Synchronization Interface
The carrier phase synchronization interface is used to establish hard wired carrier
phase synchronization with other readers through a single pair of wires. Its pin assignment is given in Table 9 and its specifications are given in Table 10.
Table 9: Carrier Phase Synchronization Interface
Pin
Signal
Description
Direction
Sync Rx+
RS422/RS485 non-inverted synchronization data
Input
Sync Rx-
RS422/RS485 inverted synchronization data
Input
GND
Signal ground
Sync Tx+
RS422/RS485 non-inverted synchronization data
Output
Sync Tx-
RS422/RS485 inverted synchronization data
Output
GND
Signal ground
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
High > +1.5 V
Low < -1.5 V
Driver Load
60 mA
Driver Output Short Circuit Limit
150mA to GND
250mA to VCC
Receiver Input
12 kΩ
Receiver Sensitivity
±200 mV
Receiver Hysteresis
60 mV
15
S2510 Reader - Reference Guide
2.2.1.5
April ’00
E - Open Collector & I/Os
This connector provide two open collector connections to and from the reader, plus
the RXSS output (used to set the local noise level), another 5 V regulated output and
an interrupt input. Its pin assignment is given in Table 11 and its specifications are
given in Table 12.
Table 11: Open Collector & I/Os
Pin
Signal
Description
Direction
VCC
Regulated 5 Volt dc Supply (see note 1 below)
Output
OC1
Open collector 1
Output
OC0
Open collector 0
Output
GND
Signal ground
INT0
Interrupt 0 (see note 2 below:)
Input
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
2.2.1.6
Chapter 2. Hardware
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 are: a standard RS232 Interface 9-pin SUB-D male connector (F1 on
Figure 3) and a 6-pin WECO connector (F2 on Figure 3). Both of these connectors
allow communication between the reader and a controlling device. The pin assignment for the SUB-D connector is given in Table 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
Not connected
TxD
Transmit Data
Output
RxD
Receive Data
Input
DTR
Data Terminal Ready
Input
GND
Signal Ground
DSR
Data Set Ready
Output
Not connected
Not connected
Not connected
Table 14: RS232 WECO Connector
Pin
Signal
Description
Direction
RxD
Receive Data
Input
DTR
Data Terminal Ready
Input
GND
Signal Ground
TxD
Transmit Data
Output
DSR
Data Set Ready
Output
GND
Signal Ground
All interface parameters are according to the RS232 specification and are not given
in detail in this manual. The DTR and DSR lines are currently not used for any purpose.
17
S2510 Reader - Reference Guide
2.2.1.7
April ’00
G - RS422/RS485 Communications Interface
Depending on the DIP-Switch configuration, the Reader will communicate via the
RS232, RS422 or RS485 interface. RS422/485 connections are made via the 6-pin
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
Direction
RS422
Direction
RS485
Rx+/Tx+
RS422/RS485 noninverted data
Input
Input/Output
Rx-/Tx-
RS422/RS485
inverted data
Input
Input/Output
GND
Signal Ground
Tx+
RS422 non-inverted
data
Output/High
Impedance
Tx-
RS422 inverted data
Output/High
Impedance
GND
Signal Ground
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
Maximum Cable Length
1200 m
Maximum Data Rate
10 Mbits/s
Maximum Common Mode Voltage
+12 V / -7 V
Driver Voltage
High > +1.5 V
Low < -1.5 V
Driver Load
60 mA
Driver Output Short Circuit Limit
150mA to GND
250mA to VCC
Receiver Input
12 kΩ
Receiver Sensitivity
±200 mV
Receiver Hysteresis
60 mV
18
April ’00
2.2.1.8
Chapter 2. Hardware
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
ACTIVE
Open collector output: RF Module transmitter signal
Output
VR270
Current limited output: (270 Ω in series to VCC)
Output
O.K.
Open collector output: O.K. signal
Output
VR270
Current limited output (270 Ω in series to VCC)
Output
RXSA
Receiver signal strength adjust output to monitor the
receiver signal strength threshold level
Output
GND
Signal ground
Table 18: Indicator Outputs - Specifications
2.2.1.9
Parameter
Minimum
Maximum
Open Collector (voltage)
10 V
Open Collector (current)
80 mA
Maximum voltage at current limiting 270 Ω resistor
5V
Receiver signal strength output voltage (RXSA)
0.7 V
1.7 V
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.
Table 19: Antenna
Pin
Signal
Description
ANT
Tx/Rx antenna
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
S2510 Reader - Reference Guide
2.2.2
April ’00
Switches
There are three banks of DIP switches on the S251B Reader, one 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 listed in Table 21, the RS422/RS485/DAT settings are listed 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
Table 21: CTL Setup DIP Switches
Switch
OFF
ON
RAM - VCC
Chip Select ROM for TIRIS
Standard Firmware
Reserved for Software Development
Reserved for Software Development
Chip Select RAM for TIRIS Standard
Firmware
Chip Select RAM for TIRIS Standard
Firmware
Reserved for Software Development
PSEN
Reserved for Software Development
See Table 22
See Table 22
TIRIS Standard Configuration
Customer Specific Configuration
Reserved
10
Reserved
11
TXCT-ON *
12
Not Connected
* When this switch (11) is switched either from ON-to-OFF or from OFF-toON the reader’s transmitter is activated for 10 seconds.
Table 22: I/O Setting Switches (6 & 7)
SW6
SW7
OFF
OFF
ON
ON/OFF
OFF
ON
Comment
No effect
Reset reader by switching RS232 DTR line
Can be used by customer firmware for hardware handshake
20
April ’00
Chapter 2. Hardware
Figure 5: RS422/RS485/DAT Switches
ON
Table 23: RS422/RS485/DAT Settings DIP Switches
Switch
OFF
ON
RS422
RS485
RS422
RS485
RS422/RS485 Rx+/Rxline-to-line termination (120 Ω)
DAT Disabled
DAT Enabled
DAT LEDs Disabled
DAT LEDs Enabled
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
Table 24: Synchronization DIP Switches
Switch
OFF
ON
Synchronization Rx+ line pull-up (180 Ω)
Synchronization Rx- line pull-down (180 Ω)
RS422/RS485 Rx+/Rx- line-to-line
termination (120 Ω)
Set the RFM to Master
Set the RFM to Slave in CPS Bus
CPS line-to-line termination (120 Ω)
21
S2510 Reader - Reference Guide
2.2.3
April ’00
Indicators
There are six LEDs on the front panel of the reader they are described in Table 25.
Table 25: Indicators
Indicator
Description
EMI
Indicates the presence of Electro Magnetic interference
TX Active
Indicates activation of the RF transmitter
Read O.K.
Indicates a response from a valid transponder
Antenna
Tuning
L↑
Antenna out of tune, inductance too high
O.K.
The DAT has tuned the antenna to maximum resonance voltage
L↓
Antenna out of tune, inductance too low
The TX Active and Read O.K. LED lines are also made available for external use if
required, details are given in section 4.7.
2.2.4
Potentiometers
There 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 Adjustment
The potentiometer can be used to adjust the internal oscillator pulse width and thus
the generated antenna voltage/field strength. Turning the 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
22
Parameter
Value
Height
120 mm
Width
120 mm
Length
200mm
Weight
900 g
CHAPTER 3
Synchronization
Chapter 3:Synchronization
If you are using more than one reader in an application, it may mean that 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 .........................................................................25
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 Synchronization ............................................................27
23
S2510 Reader - Reference Guide
3.1
April ’00
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. Synchronization in this context means that the readers in your application
are 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 situation in a particular application, for example: the type of transponder, the type of operation performed on that transponder (Charge-only read, General read, Program
page, Lock page), the size of the antennas and the speed of the transponder. The
different kinds of synchronization are described in section 3.2. How to actually setup your system to use the synchronization you’ve chosen is described together with
the other installation procedures in Chapter 5.
The distance that readers’ antennas have to be separated before the need for some
method of synchronization is required, varies with local conditions, for in addition 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 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 Synchronization
This option is only used in conjunction with Software synchronization, or if there 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 network, 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 Multipage Transponders (MPTs). Where a PLC has a number of
point-to-point connections to readers, it is also possible to coordinate 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 Synchronization.
24
April ’00
3.2.2
Chapter 3. Synchronization
Wireless Synchronization
Wireless synchronization can be used to control the coordination of readers, with
standard antennas, provided the electrical noise in the environment 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 level it assumes that it is another reader and “backs-off” for a set period 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. In noisy environments, there is too much sensitivity with larger antennas
(G04 and larger custom antennas) to allow accurate 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. Where the environmental conditions change, for example: a ground loop
antenna’s characteristics are changed by a vehicle over it, the synchronization adjustment could be wrong.
3.2.3
Wired Synchronization
Wired Synchronization works in the same way as wireless synchronization with the
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 synchronize with other groups of wired synchronization readers, or
with individual readers, by using wireless synchronization.
The advantages and disadvantages of both wireless and wired synchronization as
given above still apply.
25
S2510 Reader - Reference Guide
3.2.5
April ’00
Master/Slave Synchronization
Master/Slave Synchronization is probably the most commonly used form of synchronization. One reader is configured to be the Master and this reader then controls all
the 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 and
was originally developed for reading tagged vehicles at speed. It assumes that all
readers are on the same synchronization bus and the readers would not, for example, recognise a handheld reader that is trying (probably unsuccessfully) to perform
a 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.
2.
3.
4.
3.2.5.2
All readers must be on the same synchronization bus.
If the Master fails, all units stop.
Slave units cannot be individually tested without the Master running.
Slaves must perform exactly the same RF-Task as the Master (read the
same page, write the same data to a transponder).
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 transponder. In Master/Slave with Acknowledgement 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 corrupted data. This restriction also includes the paged read of
multipage transponders.
26
April ’00
3.2.5.3
Chapter 3. Synchronization
Triggered Synchronization
Triggered Synchronization is a Master/Slave Synchronization Bus where there is 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 operations to be carried out, for example: If multiple
readers are required to read addressed pages of Multipage 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 during 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. Cannot be used for addressing 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 circumstance, the magnetic charge-up fields generated by different
antennas superimpose on each other and may cause a beat effect on the magnetic
charge-up field, due to the slightly different transmission phases of different Power
readers. This effect will not occur when the transmitters of different readers are operated from the same oscillator signal.
This is Carrier Phase Synchronization where all of the readers 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 (Figure 7 shows the places to measure D1 and D2). This ensures 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
S2510 Reader - Reference Guide
April ’00
Figure 7: Distance between Antennas (top view)
Table 27: Distances Between Antennas
Antenna type
Distance D1
[m]
Distance D2
[m]
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
28
CHAPTER 4
Installation
Chapter 4:Installation
This chapter provides you with the information that you need to know 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
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
S2510 Reader - Reference Guide
4.1
April ’00
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 designed with easy installation in mind. The following
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 bottom 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 marked mounting holes and screw the reader to the wall
using M4 screws and the appropriate washers.
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.
4.3.1
Power Supply
Connect a Regulated dc power supply (between 10 and 24 V providing a minimum
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 supply. If this is not possible and you
wish to use a switched mode 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
4.4
Chapter 4. Installation
Communication
Follow the instructions given in the section that describes the communications setup 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 control module when
power is applied to the control module. When CTL Setup switch 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, 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 RS232C
If CTL Setup switch 8 is in the ON position, customer specific parameters are used
to operate the Control Module. These application specific parameters are stored in
the serial EEPROM on the Control Module.
Note:
The setting of CTL Setup switch 8 is only checked after power on.
You can use the Software Utility Program which is available on the internet at our
site: http://www.tiris.com to configure your reader.
In order to configure the reader for customer specific parameters you must connect
the reader via the RS232 port (connector F1 or F2) to your host and get connection
using the TIRIS standard parameters (with CTL Setup switch 8 is in the OFF position). Change the default parameters to the customer specific parameters and save
them. Set CTL Setup switch 8 to the ON position and reset the reader. The reader
will then work with the customer specific parameters.
4.4.2
RS232
Either connect a 9-pin SUB-D female plug to the SUB-D connector, or connect up the
6-pin WECO connector marked “RS232” on the reader’s front panel, the pin signals
are given in Table 28 or Table 29.
Table 28: RS232 9-pin Connector
Pin
Signal
Description
Direction
Not connected
TxD
Transmit Data
Output
RxD
Receive Data
Input
DTR
Data Terminal Ready
Input
31
S2510 Reader - Reference Guide
April ’00
Table 28: RS232 9-pin Connector
Pin
Signal
Description
Direction
GND
Signal Ground
DSR
Data Set Ready
Output
Not connected
Not connected
Not connected
Table 29: RS232 WECO Connector
4.4.2.1
Pin
Signal
Description
Direction
RxD
Receive Data
Input
DTR
Data Terminal Ready
Input
GND
Signal Ground
TxD
Transmit Data
Output
DSR
Data Set Ready
Output
GND
Signal Ground
Activation
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.
4.4.3
RS422
Connect the WECO (marked RS422 / 485) connector as shown in Table 30. Set the
switches as shown in Figure 8. If you are only using one 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
Table 30: RS422/RS485 Connector
4.4.4
Pin
Signal
Description
Direction
RS422
Direction
RS485
Rx+/Tx+
RS422/RS485 noninverted data
Input
Input/Output
Rx-/Tx-
RS422/RS485
inverted data
Input
Input/Output
GND
Signal Ground
Tx+
RS422 non-inverted
data
Output/High
Impedance
Tx-
RS422 inverted data
Output/High
Impedance
GND
Signal Ground
RS485
Connect the WECO (marked RS422 / 485) connector as shown in Table 30. Set the
switches as shown in Figure 9. If you are only using one 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
33
S2510 Reader - Reference Guide
4.5
Synchronization
4.5.1
Software Controlled
April ’00
There is no special wiring required for this type of synchronization. Make sure 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 wireless synchronization when you are configuring 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 you are configuring the reader. Table 31 explains the 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
UNIT 1:
UNIT 2...UNIT n-1:
UNIT n:
SW1
ON
OFF
ON
SW2
ON
OFF
ON
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.
34
April ’00
4.5.4
Chapter 4. Installation
Master/Slave (without acknowledgement) & Triggered Synch.
Figure 11 shows the way that the Readers have to be connected for master/slave
synchronization without acknowledgment; and triggered synchronization. Make sure
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
Unit 1:
(Master)
Unit 2...Unit n-1:
(Slaves)
UNIT n: (Slave)
SW1
ON
OFF
ON
SW2
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 Synchronization
Line
Termination
Dip Switch
UNIT 1:
Trigger Unit
UNIT 2...UNIT n-1:
(Master)
UNIT n: (Master)
SW1
Termination not required
OFF
ON
SW2
Termination not required
OFF
ON
SW3
Termination not required
OFF
ON (see Note)
35
S2510 Reader - Reference Guide
4.5.5
April ’00
Master/Slave (with acknowledgement)
Figure 12 shows the way that the Readers have to be connected for master/slave
synchronization with acknowledgement. Make sure that you set the software
configuration to Master or Slave (according to Table 34) when you are configuring
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
Unit 1: (Master)
Unit 2...Unit n-1:
(Slaves)
UNIT n: (Slave)
SW1
ON
OFF
ON
SW2
ON
OFF
ON
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
4.5.6
Chapter 4. Installation
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 Synchronization-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 Synchronization-SW4 is ON, the external oscillator signal 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 o ther
units
Master
Slave
If you are using carrier phase synchronization you must configure your system to
Master/Slave in order to have one common master.
37
S2510 Reader - Reference Guide
4.6
April ’00
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
I = Input; O = Output
38
April ’00
4.7
Chapter 4. Installation
LED Outputs
The signals used for the indicator LEDs (Read O.K. and Transmitting) are available
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
Reset
The S251B Reader provides a connection for an external reset on pin 12 of the General Purpose Input / Output connector (B). This pin can be used reset the S251B
Reader externally. You can apply an external reset to the reader by connecting a
push-button to the connectors as shown in Figure 15.
G E N E R A L I/O PO RT
39
GND
15
R E SET -
Figure 15: RESET Push-button Wiring
12
4.8
S2510 Reader - Reference Guide
4.9
April ’00
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 adjust the internal oscillator pulse
width and subsequently the antenna output voltage to conform to your local regulations. Turning the potentiometer clockwise causes the field strength to increase.
4.11
EMI / Sync. Level Adjustment
EMI / Sync. Level Adj. potentiometer to adjust the receiver signal strength threshold
for the wireless synchronization. Turning the potentiometer clockwise results in a
maximum sensitivity.
If wireless synchronization is used, it is important that the EMI/Sync level Adj. potentiometer is correctly adjusted. This is one of the final adjustments to the reader and
is done on site in the final location once the antenna has been tuned and ALL THE
OTHER READER ARE SWITCHED OFF.
Turning the potentiometer adjusts the receiver signal level threshold and you must
set the reader’s ‘base level noise’ in its final location, so that any signal larger than
the 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 adjust the potentiometer back until the LED just goes out. Adjustment is then complete.
40
CHAPTER 5
Warnings, Cautions and Notices
Chapter 5:
Warnings, Cautions and Notices
This chapter provides the Warnings, Cautions and Notices 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
41
S2510 Reader - Reference Guide
5.1
April ’00
FCC/PTT Regulations
The TIRIS Reader RF produces emissions at 134.2 kHz. The radiation of the fundamental and the harmonics will vary with the type of antenna and other 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 experimental license; second, the FCC may issue an equipment authorization permitting use of the RF device on an unlicensed basis. TI can
assist the user in obtaining an experimental license that will cover a specific installation of the S251B Reader in a specific site or sites. Experimental authorizations are
appropriate to cover operations during the development of an RF device. A grant of
equipment authorization (known as "certification") must be obtained from the FCC
before RF devices are marketed or operated on a non development basis.
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 DEVICE CONTAINING THIS Reader IS MARKETED, AN EQUIPMENT AUTHORIZATION FOR THE
DEVICE MUST BE OBTAINED FROM THE FCC.
Prospective marketers of devices containing this 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.
5.3
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 Reader.
42

---

Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.3
Linearized                      : No
Create Date                     : 2000:04:27 16:00:21
Producer                        : Acrobat Distiller 4.0 for Windows
Modify Date                     : 2001:07:12 10:13:35+02:00
Page Count                      : 42
Has XFA                         : No

EXIF Metadata provided by EXIF.tools