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Path: utzoo!mnetor!lsuc!sickkids!daniel
From: daniel@sickkids.UUCP (Daniel Guerin )
Newsgroups: comp.sys.mac
Subject: Simple digital input interface needed
Message-ID: <60@sickkids.UUCP>
Date: Fri, 26-Jun-87 13:22:26 EDT
Article-I.D.: sickkids.60
Posted: Fri Jun 26 13:22:26 1987
Date-Received: Sun, 28-Jun-87 04:00:51 EDT
Organization: Hospital for Sick Children, Toronto
Lines: 18

I am looking for a simple data acquisition device that would allow
me to sense the state of up to 8 contact closures with a Macintosh.
The device would be a parallel to RS232 converter, so that each time
one of the input lines changes state, a byte would be sent (there is
no need to sample at fixed intervals) reflecting the current state,
for example using one bit per line.

I am aware of the various data acquisition boxes (MacAdios, Taurus, BenchTop)
and am really looking for something much simpler; a reference to a schematic
would be fine; I can build the thing, and will write the software in any case.
I have read somewhere that a University (Berkeley?) sells a simple data
acquisition device in kit form but I can't find the reference;
may be this would do what I want.

Thanks in advance for the help.

Daniel Guerin, The Hospital for Sick Children
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