RS232 <=> RS422

[Hans Franke]

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
looks fine. 

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

Gruss
H.
--
VCF Europa 8.0 am 28/29.April 2007 in Muenchen
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