The LPT "standard" function for pin 11 is a busy flag from the printer to
the computer. When the printer asserts a logic one on this pin, the normal
LPT response is to stop sending data to the printer until the busy flag is
set low by the printer. It is a handshake pin indicating the status of a
print buffer in the printer. So the electrical interface in most computers
is configured as a logic input. It cannot be used as ground. Pin 18 is
the ground pin on the 25 pin LPT connector. The pin numbers above 18 are
usually ground also, but some manufacturers may not have made all the
connections.
Regards - Pete W8TWA
At 02:46 PM 3/4/2005, Ed Parish K1EP wrote:
>At 3/4/2005 07:13 AM, Kersus, Gerald J (Gerry), ALABS wrote:
> >Bob,
> >I happen to run two PCs: one running CT Version 10 on DOS and the other
> >running CTWin Version 10 on Windows 98. I also use CVB with a homebrew
> >interface that uses the LPT output for keying the radio. With Version
> >10, LPT doesn't work with either the DOS or Win98 PC!! Going back to CT
> >Version 9 works just fine.
>
>As someone stated, you may have to change the BIOS to set the correct type
>of parallel port. Also, I noted that the LPT port pinout on the k1ea
>website says that pin 11 is ground. I looked at it the other day and it
>wasn't. Maybe one version of the software sets or resets that bit to
>ground and one doesn't. If your interface uses pin 11, you might want to
>switch to some other ground pin, such as 18.
>
>
> >Gerry, W1GD
Peter Hansen, W8TWA
13680 Sprague St.
Gowen, MI 49326-9507
Email: pehansen@umich.edu
Needed countries: BS7H, FR/g, FR/t
DXCC-HR, 5BDXCC, WAZ
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