AutomationDirect C0-USER-M Manual page 250

Case 4: Connect Com Port 1 or 2 to an RS-232 port on another device
You need to cross the RTD and TXD signal lines and connect 0V on both com ports.
CLICK Com
Port 1 or 2
You can make your own cable. However, we offer two products that make your wiring much
easier:
1. ZIPLink feed-through module and cable
CLICK PLC
2. ZIPLink pig-tail cable
CLICK PLC
CLICK PLC Hardware User Manual, 6th Edition, Rev. F – C0-USER-M
1 0V
3 RXD
4 TXD
ZL-RJ12-CBL-2
ZL-RJ12-CBL-2P
Chapter 4: PLC Communications
RS-232 Port on
Another Device
0V
RXD
TXD
ZL-RTB-RJ12
Pigtail
4–15