Re: TRS-80 RS-232?

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1 total messages Started by sherman@induce.e Wed, 26 Feb 1992 20:56

#3960

Author: sherman@induce.e
Date: Wed, 26 Feb 1992 20:56

18 lines
836 bytes

In article <1992Feb26.182329.29423@engage.pko.dec.com>, sherman@induce.enet.dec.com (My name is...) writes...
>
>Right off the bat I know this won't work because when the printer asserts DTR
>(-12 V) the CoCo indicates that the printer is not ready.  More, if I force
>RD to +12V, then the CoCo thinks the printer is ready and sends stuff to TD.

Ooops.  That should read:
Right off the bat I know this won't work because when the printer asserts DTR
(+12 V) the CoCo indicates that the printer is not ready.  More, if I force
RD to +12V, then the CoCo thinks the printer is ready and sends stuff to TD.

The assertion of DTR at +12V seems valid as it goes to -12V when the printer
is in an alarm state.  I *may* go with hard-wiring RD to DTR (with CD) as that
seems to be what others have done.  Still doesn't feel right ...

Steve

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