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Article #147Re: PC interfacing - Control External Equipment via com port ?
From: Paul
Date: Sat, 02 Nov 1996 00:00
Date: Sat, 02 Nov 1996 00:00
17 lines
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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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X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 1036bc,d7d494455809b261 X-Google-Attributes: gid1036bc,public X-Google-Thread: 114575,4d90c5aa53a64485,start X-Google-Attributes: gid114575,public X-Google-Thread: 107cee,d7d494455809b261 X-Google-Attributes: gid107cee,public X-Google-Thread: 105d97,d7d494455809b261 X-Google-Attributes: gid105d97,public From: paul@intra.demon.co.uk (Paul) Subject: Re: PC interfacing - Control External Equipment via com port ? Date: 1996/11/02 Message-ID: <846906499.27257.0@intra.demon.co.uk> X-Deja-AN: 193839262 x-nntp-posting-host: intra.demon.co.uk references: <845933481.19107.0@intra.demon.co.uk> organization: Home newsgroups: sci.electronics.misc,demon.tech.pc,sci.electronics,uk.telecom