Article View: comp.sys.dec.micro
Article #1794Printing - LA50 XON/XOFF problems
From: Powell HEUER
Date: Wed, 20 Dec 1989 19:21
Date: Wed, 20 Dec 1989 19:21
19 lines
1455 bytes
1455 bytes
In article <847@tardis.Tymnet.COM>, jms@tardis.Tymnet.COM (Joe Smith) writes: > The usual causes of this (XON/XOFF problems) are: > 1) The computer is not configured to respond to XON/XOFF from the printer. > 2) The cable to the printer is defective, and not passing pin 2 back. > 3) The motherboard in the printer has gone defective and transmits garbage. > > Case #3 is what I see a lot of. I have encountered another cause of similar problems. Unlike most other printers/terminals, it seems that pins 1 and 7 on the RS232 interface (protective and signal grounds) are not tied together at the LA50 chassis. I found this out the hard way with a faulty cable that had a break in one of these (I can't remember which). The symptom was that the printer could receive and print text but XON/XOFF characters it sent were not received correctly. This lack of correct ground could also make the printer more susceptible to interference and damage to the logic board - a contribution to some of your case #3's?
Technical Details
Message-ID:
<20@decus.com.au>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!munnari.oz.au!basser!usage!decus!heuerReferences:
<8912032300.AA02025@LANAI.MCL.UNISYS.COM> <847@tardis.Tymnet.COM>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!munnari.oz.au!basser!usage!decus!heuer From: heuer@decus.com.au (Powell HEUER) Newsgroups: comp.sys.dec.micro Subject: Printing - LA50 XON/XOFF problems Message-ID: <20@decus.com.au> Date: 20 Dec 89 19:21:07 GMT References: <8912032300.AA02025@LANAI.MCL.UNISYS.COM> <847@tardis.Tymnet.COM> Organization: DECUS, South Pacific Chapter Lines: 19