Probe lpt port

Probe lpt port

Post by Michael Hac » Wed, 06 Oct 1999 04:00:00

Hello all,

I am running SCO OpenServer 5.0.4 with Boundless multiconsole stations at 50
remote locations.

I have a shell script which changes default printer settings (e.g. from PPDS
to PCL).  The printer may be connected to any of 5 lpt ports at remote
locations, and I want the port details transparent to the user running the
shell script.

Is there a way I could probe the lpt ports to find which one the printer is
connected to, and then run the PJL codes to set the printer?



1. LPT port puts out -3.3V not 5V

Hi there

I read the coffee mini howto and it told me howto control the output of my
parallel port. I used this to control my fishtank lights. Everything was
good until I moved the system to a different computer (the old one broke)
and then the relays no longer switched. I measured the "on" voltage from pin 2
of the parallel port (the same one that worked before) and it said the
voltage was -3.3V not 5V like it was on the old computer. Is there some
register I have to set or something to make it work better.

I have changed the bios setting for the parallel port to "NORMAL" the
other options were ecp and epp. I tried those too but the result was the

the basics of the mt program are as follows

// something

ioperm(0x378, 3, 1);      // get permision for the LPT port
outb(1,0x378);            // turn on pin 2
ioperm(0x378, 3, 0);      // close the port

// something else

I have a Gigabyte motherboard, GA-6VTXE-A, there is a block diagram in
the manual and the thing that connects to the LPT port is "VIA VT82C686B"

Can you help, or point me in the right direction for help?

Thanks a lot in advance

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