User's Manual

Connecting External Devices
2-6 Reader RD21 Installation and Connections
TRM95 230V, as required by the local AC power line voltage.
Figure 2-4: Power Supply Connections
To connect the power supply to Reader RD21, refer to Figure 2-5 and complete the following steps:
1. Unplug terminal block TB2 from its connector TB1.
2. Run the power supply cable through the cable grip into the Reader’s enclosure.
3. Connect the power wires to the TB2 pins marked with the “~” symbol.
4. Connect the main ground connection to the TB2 pin marked with the ground symbol.
5. Switch on the power supply TRM95.
6. Check the voltage on terminal block TB2 (between pins marked with the “~” symbol).
7. Plug terminal block TB2 into its connector TB1.
8. Re-check the voltage on the terminal block TB2 in Step 6.
9. Check the MBD21 to see whether the green POWER LED goes ON, and the red DATA LED
stays ON continuously for 6-7 seconds and then turns OFF.
10. Switch off the power supply.
Connecting External Devices
Figure 2-5 shows you how to connect external devices to the Reader.
RESET
CNO COM C NC
A B Z Y
A B Z Y
+ - OS I/0
+ 8V DTA PWR
J1
Load
Open
J2
Load
Open
DATA
POWER
Controller CTL21
J2
S95
S21
J3
J1
Load
Open
Load
Open
TB2
12 Vac 12 Vac
DATA
Red LED
Power
Green LED