Splitting a Serial Port

flcusat · December 2006

There is any way to split a serial port for 2 rs232 identical components? This would be just one way communication to two Panasonic Plasma just to turn them On and Off at certain time of the day.

Hedberg · December 2006

Yes, this sort of thing can be done. See, for example:

http://www.compuphase.com/electronics/rs232split.htm

The gender of the DB9s needs to be adjusted for the application. For your situation, probably J3 needs to be male and the connection should be to terminal 3 instead of 2.

champ · December 2006

If the devices are not ID addressable you should only split pin 3 (Tx) and not use pin 2 (Rx) because when you send data to 2 devices simultaneously they will both respond simultaneously which will cause problems

Other than that it is quick and dirty and it works

TurnipTruck · December 2006

The "Correct" way to do it would be to use an active RS-232 port expander. Take a look at the Kramer Electronics VP-14. As stated in another thread, you may not want to connect the TXDs from you controlled devices if you cannot make them respond independantly.

Splitting a Serial Port

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