[futurebasic] Re: [FB] RS232 communications

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From: Peter Bancroft <peter@...>
Date: Sun, 7 Apr 2002 13:37:32 +1000
>Thank you it begins to make sense. I notice that the cable I use
>successfully with the Fluke meter have the following connections:
> Tx-, RD-, Gnd  connected to TD, RD, Gnd respectively. Is this the same as
>Tx+, RD+ and Gnd connected to  RD, TD and Gnd, respectively?

No, there are transmitters conneted to transmitters and receivers connected
to receivers in that cable. A transmitter _must_ be connected to a receiver.

The Mac has a differential output, while rs232 has a single ended output.
On the Mac , it is the difference between the tx+ and Tx- pins that are of
interest. Usually this is also equivalent to the swing of Tx+ about ground.