RS232 <=> RS422
Hans.Franke at siemens.com
Tue Jun 27 07:12:31 CDT 2006
Am 27 Jun 2006 12:07 meinte Jules Richardson:
> I've got some equipment here that has RS422 serial on it - i.e. it uses
> differential signal pairs rather than RS232's reference against ground.
> Question is, can I wire up a cable so that I can use an RS232 terminal with
> this RS422 equipment? (running over a short distance)
YMMV <- maybe the most apropriate US abrevation :))
It's for shure outside the specs it may or it may not work.
Usualy I'd recommend using a nice 8 Pin Max 3462. It's just 3 Bucks
and will remove a lot of possible debugging. Beside that, your cable
Sill, the 422 Specs define +/- 2 V as low and +/- 6V as high for the
sender side and +/- 0.2V as minimum for receiving circuits.
> (the actual comms chip is a 6551A, then the receiver for RXD and CTS is a
> 26LS32 and the driver for TXD and BSY is 26LS30)
Use a Max3462
VCF Europa 8.0 am 28/29.April 2007 in Muenchen
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