Campbell Scientific COM320 Voice Communications Modem - Manual (Page 43)

Appendix C. CS I/O 9 Pin Serial Port
The COM320’s CS I/O port is not a standard RS-232
connection. NOTE
Pin Description
The COM320 modem connects to the datalogger using an SC12 cable
connected to the datalogger’s CS I/O port. The COM320’s connector
configuration is shown in Figure C-1. Table C-1 shows the I/O pin
configuration, and gives a brief description of the function of each pin.
CS I/O
FIGURE C-1. COM320’s Male 9 Pin Connector
C-1