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From: kloppen@gmdzi.gmd.de (Jelske Kloppenburg)
Newsgroups: comp.sys.next
Subject: RTS/CTS flow control O.K.
Keywords: modem flow RTS/CTS cufa 19200
Message-ID: <4978@gmdzi.gmd.de>
Date: 23 Jun 91 19:21:23 GMT
References: <4975@gmdzi.gmd.de> <1991Jun23.023945.2896@umbc3.umbc.edu>
Organization: GMD, St. Augustin, F.R. Germany
Lines: 28

brian@umbc4.umbc.edu (Brian Cuthie) writes:

>In article <4975@gmdzi.gmd.de> kloppen@gmdzi.gmd.de (Jelske Kloppenburg) writes:
>>Hello,
>>...
>>I tried my modem connection with cufa. To be sure, I inserted a breakout
>>box and interrupted CTS. ...

>Well, you may want to actually assert the signal to the desired state.  Since
>you don't know what state it floats at, you can't be sure that simply
>interrupting it actually causes the host to see loss of CTS.

>My guess is that it floats in the "let the data go" state.  That way, if 
>you use the cuf[n] device, and CTS is not wired, it will still pass data.

That was it. After this hint, I connected an Atari with which I could
assert and deassert the signals and I could verify the flowcontrol.

>Let me know if this works.

It works!

>-brian

Thanks, j.k.

  Jelske Kloppenburg, kloppen@gmdzi.gmd.de, (++49 2241) 14-2433
  German National Research Center for Computer Science (GMD)