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From: joels@tekred.UUCP
Newsgroups: comp.sys.amiga
Subject: RS232 hardware problem
Message-ID: <1028@tekred.TEK.COM>
Date: Wed, 4-Mar-87 12:27:28 EST
Article-I.D.: tekred.1028
Posted: Wed Mar  4 12:27:28 1987
Date-Received: Sat, 7-Mar-87 00:04:44 EST
Organization: Tektronix Inc., Beaverton, Or.
Lines: 15
Keywords: low voltage


   I am having a problem with the Amiga RS232 port. I am trying to use
it to talk to an X10 powerhouse. The Amiga can hear the X10, but the
X10 cannot hear the Amiga. The Tek 834 DCA I'm using for debugging can
hear both, and the X10 can hear the 834. I put a scope on the transmit
line from the Amiga to measure the voltage levels. I found the positive
swings to go to about 12-15 volts but the negative only to minus
1.25-1.5 volts.  This is not within the RS232 specs. It does work with
other devices such as the Hayes modem though. I also tried the program
on Wendy's Amiga (I didn't check the voltage levels) and the results
are the same.  Is this problem generic to the Amiga, or do we both have
a hardware problem? Any ideas for a fix?

Joel Swank
Tektronix, Redmond, Oregon