9-pin null modem cable
Telephone circuits

9-pin null modem cable

By internum


9-pin to 9-pin female

Nullmodem Cable, 9 to 9 Pin Female D-SUB
Nullmodem Cable, 9 to 9 Pin Female D-SUB

Signal Description:
1 - Carrier Detect
2 - Receive Data
3 - Transmit Data
4 - Data Terminal Ready
5 - System Ground
6 - Data Set Ready
7 - Request to Send
8 - Clear to Send

Pins 6 &1 are wired together to simulate 'on-line' status. This Nullmodem configuration is also for gameply like Westwood's Command & Conquerer "Tiberian Sun".

1345 22 August 2007

See also:

Electronics Telephone Talking Circuit
This is the basis of electronics telephone sets.
Telephone In-Use Indicator
Circuit to illuminate an LED when any phone extension is off-hook. LED should illuminate when circuit is off-hook.
2 line intercom plus a telephone changeover switch
The circuit presented here can be used for connecting two telephones in parallel and also as a 2-line intercom.

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