IDing WYSE terminal - test-drb@ccmp.vtda.org

11 Oct 2001

...
 If the daughtercard is indeed an RS422 interface, as
someone
suggested, an ordinary RS232 or RS423 terminal will probably not work. 
Thanks to a link I found pointing to a reference page on wyse's web site, 
I have found out MUCH more info on this.

Yes, the card is a RS422 card. Wyse even specifies that the ONLY company 
that it was made for was Isoetec, and they give the part number on it 
(and specify that replacements have to be bought thru isoetec). They do 
imply that it can be fitted on a standard wyse 60, but don't come right 
out and say that.

...
  RS232 and 423 are single-ended interfaces, which means
that each signal
consists of one wire plus a common ground connection.  RS422 is a
differential system, where each signal has a positive and negative
connection.  If your system is intended to connect to an RS422 terminal,
you'd need to do some hardware hacking to make it work. 
This suddenly makes all the sense in the world as to why my laptop can't 
connect to it. My laptop just has a standard RS232. I will probably have 
to try my Mac as it has an RS422 port on it. Otherwise, I am fairly sure 
I have a 422 serial card for a PC, I can always lug a whole PC to the 
site (it is at a different office, so hands on tests are hard to do... I 
make a list of things to try, and do them all in one visit)

...
 Do you have any
information on the pinout of the interface? 
the Wyse link I came across has some info on it. IF I can track down the 
tech manual for the phone system, and IF it is like the manual I have to 
my 96 phone system, then it will have lots of tech info on pinouts... but 
so far I have been unsuccessful in finding a 66 techmanual :-(

-chris

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