101-001 (iTDC), 101-002 (EIO88), 101-145 (iTDCSR) -28- Users Manual
IDTeck – iTDC 2~4 DOOR ACCESS CONTROLLER
6.3.3 RS-422 CONNECTION (MULTIPLE iTDC CONNECTIONS)
RS422/RS232 converter is required to use RS422 communication between multiple iTDCs and a host
computer. Please follow the following instructions.
1 unit of iTDC can use a TCP/IP internal module for communications. And an iTDC used TCP/IP internal module
can communicate with other iTDC Controllers by RS422 method.
In this case, the communication must be connected via RS422 method.
First, you have to connect all RS422 port of all iTDCs in parallel.
- Connect RS422-TX (+) of one iTDC to RS422-TX (+) of another iTDC.
- Connect RS422-TX (-) of one iTDC to RS422-TX (-) of another iTDC.
- Connect RS422-RX (+) of one iTDC to RS422-RX (+) of another iTDC.
- Connect RS422-RX (-) of one iTDC to RS422-RX (-) of another iTDC.
Second, you have to connect one of RS422 port of iTDC to RS422/RS232 converter.
- Connect RS422-TX (+) of the one iTDC to RX (+) port of the converter.
- Connect RS422-TX (-) of the one iTDC to RX (-) port of the converter.
- Connect RS422-RX (+) of the one iTDC to TX (+) port of the converter.
- Connect RS422-RX (-) of the one iTDC to TX (-) port of the converter.
- Plug in the RS232 9-pin connector of the converter to the COM1 or COM2 Port of the PC.
- Install and run iTDC Application Software.
Figure: RS-422 Communication between iTDCs and Host Computer