86 CCM840/1640 Installer/User Guide
Appendix B: Device Cabling
Each CCM serial port has an RJ-45 connector for attaching a serial device. The
following table lists the pin assignments.
Port Pin Assignments
Pin # RS-232 Signal Direction Description
1 RTS Output Request To Send
2 DSR Input Data Set Ready
3 DCD Input Data Carrier Detect
4 RxD Input Receive Data
5 TxD Output Transmit Data
6 GND (N/A) Signal Ground
7 DTR Output Data Terminal Ready
8 CTS Input Clear to Send
NOTE: RI (Ring Indicate) is not supported
Figures B.1 through B.3 show the wiring diagrams for cables that connect from
CCM ports to terminals/printers, PCs and modems.
Figure B.1: Cable Pin Assignments for RJ-45 to Terminal/Printer
