It is a requirement of RS-232 that any interface pin will tolerate a low
impedance short circuit to anything in the range -25V to +25V, so
shorting two outputs together is within specification, even if the
resulting logic level may be indeterminate.
This is only true of compliant interfaces, and not necessarily true of
merely compatible ones.
--
David Woolley
Owner K2 06123
On 14/09/14 16:29, Dick Dievendorff wrote:
That's surprising, but that's OK as long as you don't try to connect two
RS-232 transmitters. RS-232 isn't designed for multiple transmitters trying
to hold TxD at + or - 12V (or somewhere near there).
So if you depend on that amp polling, you wouldn't want to connect a
computer also.
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