Digital Input from RS232

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Thread Starter

Jay Kirsch

I need to have a Modbus device (PLC) detect when the RTS signal
comes on in an RS232 connection between a DSU/CSU and a router.

Any ideas on this ? Thanks.

Jay
 
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Eric M. Klintworth

The RTS signal is 12VDC, with several mA available. Why not just run it
to an optoisolator, with the optoisolator output connected to an input
on the PLC?

Eric M. Klintworth, P.E.
Columbus, Ohio USA
 
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