
Appendix C Pinouts
COM1 Cable: DB9 and Audio Jack Pinouts
C-3
C.2. COM1 Cable: DB9 and Audio Jack Pinouts
Figure C-2: Serial Port Cable CN1 and CN2 Connectors
COM 1 Cable: Connects a PC running a terminal emulation program
CN1 Pin Number Pin Name
1 Ground
2 TXD
3 RXD
CN2 Pin Number Pin Name
1 NC
2 RXD
3 TXD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 NC
♦ Pin 4 and Pin 6 are shorted
♦ Pin 7 and Pin 8 are shorted
Table C-2: COM 1 Cable, RS-232C CN1 and CN2
Pinout Definitions
NOTE:
Null modem is used for wire-swap. A null modem is necessary for connecting COM1 CN2 to a
PC serial port.
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