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Article #147

Re: PC interfacing - Control External Equipment via com port ?

#147
From: Paul
Date: Sat, 02 Nov 1996 00:00
17 lines
1742 bytes


> I am now using a spare i/o card which gives slightly more than 5V on pins 2 to 9.
> However the 'logic' is the opposite way round to the last card i.e. PC boots with pins set high, 
>releasing 5V, I then set all pins low by sending 1's not 0's (out &h378,127) in my autoexec. I then 
>need to send 0's to the pins to set them high. I have had to edit my software which I wrote for the first 
>card to operate my second card. Is it correct for different cards to have different logics, or am I doing
> something wrong.

Please ignore the above, I checked the printer cable and found I had
crossed over some of the wires. The logic is now fine i.e. 1 high 0 low,
it  seems easier to program now as you do not have to mask all the bits.
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From: paul@intra.demon.co.uk (Paul)
Subject: Re: PC interfacing - Control External Equipment via com port ?
Date: 1996/11/02
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