User's Manual

Connecting External Devices
2-8 Reader RD21 Installation and Connections
12. Switch off the power supply.
Note Terminal block pins marked 22Vac and GND can be used to transit Exciter power wires if they are
run through the Reader enclosure.
Connecting External Devices
Figure 2-6 shows you how to connect external devices to the Reader.
Caution Do not exceed the maximum ratings for the relay contacts and Motion Sensor input as stated in
Appendix A, Specifications.
Figure 2-6: External Devices Connections
RESET
CNO COM CNC
A B GP Z Y
A B GP Z Y
+ - GND MS I/0
+ 8V DTA PWR
J1
Load
Open
J2
Load
Open
DATA
POWER
Controller CTL21
J2
S95
96/S21
J3
J1
Load
Open
Load
Open
NO NC
COM
TB14
RELAY
+12.0Vdc
GND
MS
NC/NO
C
Motion Senor
GND
TB12
Optional I/O
+22.0Vac