If it's just a need for one bit of software, to send the same command to
two devices at the same time. Just parallel wire some connectors together.
One Serial OUTPUT, will usually drive two INPUT's without issue. All
you need is the TXD wired to two RXD's, and the corresponding
ground/common wire of course. (And the same baud rate, start/stop bit
and parity settings etc.)
Now, if you want to get data /back/ from BOTH device's, then that's an
entirely different can of worms!
From one, easy. From both /reliably/, not so, unless you can
/guarantee/ that only one device will respond at any one time and /only/
when you ask it to.
Even then, you'll need at the bare minimum two diodes and a resistor.
(Note! That may be troublesome at high baud rates with such a simple
scheme.)
Have Fun. ;-)
Dave G0WBX.
--
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