User's Manual

Connecting the Power Supply
Reader RD21 Installation and Connections 2-5
Caution Before installing the RFID System, label the two wires of one line of RS-485 as A1 and B1, and the
other two wires of RS485 as A2 and B2. Keep this naming convention for all connections made on
this communication line.
4. Set the termination load RS485 communication line for each two-wire line. The ends of a
multidrop network line can be easily identified, because only one communication cable is
connected to that equipment. To connect an 100 ohm terminating load on each separate RS485
line, place jumper P1 between pins 1-2 of J1(Load position), and jumper P2 between pins 1-2
of J2 (Load position). For any other equipment connected to this communication line, place
jumpers P1 between pins 2-3 of J1, and P2 between pins 2-3 of J2 respectively (open position).
5. Plug terminal blocks TB2 and TB4 into connectors TB1 and TB3 respectively.
Connecting the Power Supply
The Reader RD21 requires a 12Vac or 13 to 16Vdc power source, and a maximum current of 0.3A.
For more information on the Reader, see
Appendix A, Specifications. The power supply connector
is located on the Motherboard MBD21. The MBD21 is the bottom board of the Reader Module
Assembly (P/N 500020).
Notes 1. To connect the power supply, use electrical wire gauge 16 AWG (minimum).
2. The main ground connection of the Reader is on the power supply connector. It is indicated by
the ground symbol. Use an electrical wire with at least gauge 16AWG for the main ground
connection.
3. To power up Reader RD21 we recommend using Power Supply, model TRM95 120V or
RESET
CNO CO M CNC
A B Z Y
A B Z Y
+ - OS I /0
+ 8V DTA PWR
J1
Load
Open
J2
Load
Open
DATA
POWER
A B Z Y
A B Z Y
TB2
Incoming Cable
Out going Cable
TB4
P3
1
P1
J2
Load
Open
P2
J1
Load
Open
Controller CTL21
J2
S95
S21
J3
J1
Load
Open
Load
Open
J3
S95
S21
1
1
RS485_ CMD RS485_ SGN RS485_ CMD RS485_ SGN