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Use: RS-232 Pinout
Pin Signal Description
1 DCD
2 TD
3 RD
4 DTR
5 GND
6 DSR
7 RTS
8 CTS
9 Contact Closure
RS-232 Pinout:
The diagram below shows the pin assignments for the female RS-232 connector on the DSP.
*Note! Pin 9 is used for contact closure input. This pin is not normally used by RS-
232 devices. Some laptop and desktop computer COM ports have been observed to
“pull” pin 9 to ground; this will cause unexpected behavior of the contact closure
function if pin 9 is not disconnected on the PC end of the cable. If this behavior is
observed, make sure that pin 9 is disconnected on the PC end of the cable.