David,
That is true the specification says that condition will not cause damage
to compliant drivers and receivers, but if two drivers are placed on an
RS-232 signal line, they will *not* work together and will result in
corrupt data (assuming they are on the TXD or RXD signal lines).
You are correct that damage may occur to non-compliant (but compatible)
drivers and receivers. The PC serial cards, USB to serial adapters, and
most ham gear do not implement compliant RS-232 interfaces.
73,
Don W3FPR
On 9/15/2014 6:14 AM, David Woolley wrote:
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.
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