Texas Instruments 2000 series Reference Manual

Series 2000 Reader System
Reader S251B (RI-STU-251B)
For detailed operating, connection and set-up instructions, please refer to the
corresponding Reference Guide (11-06-21-054) available from our TIRIS Document
Center at
Connectors
J
A
1 2
1
1 2 3
+ -
Power Fuse General Purpose Input / Output
Power Range Setting
On
Reader S251B
CTL Setup
On
1
O.C. - I/O
1 6
E F1
The default switch settings for "CTL Setup", "Synchronization" and "RS422/RS485/DAT"
are shown in the figure above.
In order to gain access to the fuse and connectors J, H and I, please remove the upper
and lower plastic cover strips. (remove the four screws holding the front panel)

Power Supply

Connect a regulated dc power supply (between 10 and 24V 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.
(Default setting pin 2+3 connected – input power 18 – 24V, operating temperature range
–20°C to +70°C)
We recommend to 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 200kHz.
(Switched mode power supplies that operate below 200kHz might interfere with
transponder signals and thus reduce the reading range.)
______________________________________________________________________
FCC ID: A92S251B
http://www.ti-rfid.com
B C
15 1
Synchronization
On
1
RF Power Output Adj.
EMI / Sync. Level Adj.
EMI L á
Antenna
TX Active
O.K.
Tuning
Read O.K. L â
On
1
RS232 RS422 / 485
1 6 1 6
F2 G
1
Getting Started
D
6 1 6
A – Power Supply Connector
B – General Purpose I/O
C – Synchronization Interface
D – Carrier Phase
E – Open Collector & I/Os
F1 & F2 – RS232 Interface
G – RS422/485 Interface
H – Indicator Outputs
Antenna
RS422
I – Antenna Connector
RS485
DAT
J – Power Range Setting
1 2
I
H
Synchronization Interface
11-06-22-095 07/01