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 Posted: Friday May 8th, 2009 04:21 am
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ident



Joined: Wednesday Aug 9th, 2006
Location: Singapore
Posts: 3493
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The circuit shown in the earlier post was for monitoring the data sent from two devices, a UCM and another serial device using a switch
The switch connects either of the two devices' transmit pin to the PC Receive pin on Rs232 (ie Pin 2 on the Female DB9)
There is no connection from the PC Transmit pin to the 2 devices
If you need to send data the other way you will need to connect another switch which will connect pin 3 to the selected device, but this must at the same time disconnect the other device. It is easier to just connect individual cables when needed
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