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Article #818Re: bidirectional centronics port
From: Len Chisholm
Date: Mon, 14 Dec 1992 00:49
Date: Mon, 14 Dec 1992 00:49
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There is nothing difficult about sending information back from a printer to a DEDICATED program. The program says to the printer 'Tell me' and then reads a serial bit-stream back from one of the handshake lines, perhaps using another as a clock and some form of interlock. Lap-link etc need special cables to connect the OUTPUT pins of one computer to the INPUT pins of the other, whereas the printer already has output drivers on the handshake output lines. -- ------------------------------------------------------------------------- | LEN CHISHOLM , Systems programmer | EMail: L.Chisholm@massey.ac.nz | | Department of Production Technology | Phone: +64 6 3505262 | | Massey University | FAX: +64 6 3505604 | | Palmerston North, New Zealand | | -------------------------------------------------------------------------
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Path: arc1-ca.pugleaf.net!sparky!uunet!wupost!waikato.ac.nz!comp.vuw.ac.nz!cc-server4.massey.ac.nz!L.Chisholm Newsgroups: alt.msdos.programmer Subject: Re: bidirectional centronics port Message-ID: <1992Dec14.004912.6491@massey.ac.nz> From: L.Chisholm@massey.ac.nz (Len Chisholm) Date: Mon, 14 Dec 92 00:49:12 GMT References: <Bz1qBr.18K@watserv2.uwaterloo.ca> Organization: Massey University, Palmerston North, New Zealand Summary: Easy for printer to send info back to DEDICATED program X-Reader: NETNEWS/PC Version 2c Lines: 16