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Article #68947Re: Addressing individual serial port pins - possible?
From: George Poulson
Date: Fri, 19 Apr 1996 00:00
Date: Fri, 19 Apr 1996 00:00
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Tim Carter (tim@pzoptic.demon.co.uk) wrote:
: Is this possible and if so how? If not serial port pins then any other
: port?
If you need +5v and 0v then you need to use the parallel port; serial port
lines drive to +12v and -12v (ish!)
Assuming you're using DOS and a "standard" PC this is quite easy to
achieve by writing directly to the hardware. I have implemented several
circuits like this, such as an A-D converter which does a 12-bit conversion
and then latches the data and reads it in into the PC parallel port as two
separate bytes (the port is only 8 bits wide).
Give us a bit more info on exactly what you want to achieve, or I can post
appropriate bits of 'C' code (either here or by email).
Hope that helps!
--
George Poulson GP Designs Limited 01782 815231
george@gpdesign.demon.co.uk Computer systems & software
Electronics design & development
email: gpdesign@gpdesign.demon.co.uk
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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 1036bc,6e54c45d9fbd1089 X-Google-Attributes: gid1036bc,public From: George Poulson <george@gpdesign.demon.co.uk> Subject: Re: Addressing individual serial port pins - possible? Date: 1996/04/19 Message-ID: <1996Apr19.061701.9627@gpdesign.demon.co.uk> X-Deja-AN: 150578357 x-mail2news-path: disperse.demon.co.uk!post.demon.co.uk!gpdesign.demon.co.uk x-nntp-posting-host: gpdesign.demon.co.uk references: <83h1fBA1z5cxEwpu@pzoptic.demon.co.uk> organization: GP Designs Limited newsgroups: demon.tech.pc