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- Newsgroups: comp.sys.mac.programmer
- Path: sparky!uunet!caen!via.dsf4.merit.edu!Mike.Alexander
- From: Mike Alexander <Mike.Alexander@umich.edu>
- Subject: Re: Reading Serial GPi line
- Message-ID: <MXk-wTA@engin.umich.edu>
- Date: Sat, 29 Aug 92 15:23:30 EDT
- Organization: University of Michigan, ITD-Research Systems
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- X-Xxdate: Sat, 29 Aug 92 20:21:31 GMT
- References: <BtC4q0.tC@iat.holonet.net>
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- Lines: 23
-
- In article <BtC4q0.tC@iat.holonet.net> Allen J. Curtis,
- ajcurtis@iat.holonet.net writes:
- > I am interfacing a piece of hardware to the MAC via the serial
- >port. The hardware communicates back to the computer via the GPi
- line.
- >
- >According the the documentation in the Hardware Technical reference
- manual
- >this line is connected to Data Carrier Detect (DCD) and can be polled
- with
- >software. However, I can not find the method of polling this field
- in any
- >of the documentation or the header files which define the serial
- status
- >information.
-
- See Tech Note 286. It goes into this subject in fair detail.
- Although I haven't actually had to do this, it doesn't look too hard,
- especially if all you want to do is read the value of GPi.
-
- Mike Alexander Internet: Mike.Alexander@umich.edu
- University of Michigan America Online: MAlexander
- ITD - Research Systems AppleLink: UMICH
-