[Elecraft] [acom-list] Re: Elecraft K3 and ACOM 2000A

[David Woolley]

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.