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GM7HUD > AGW 18.06.07 21:16l 27 Lines 892 Bytes #999 (0) @ WW
BID : 0E4660GM7HUD
Read: GUEST
Subj: Re: Printer port oddity
Path: DB0FHN<DB0MRW<OK0PKL<DB0GRL<SR6BBA<SR1BSZ<IW2OAZ<ZL2BAU<GB7MAX<GB7SYP<
GB7ESX
Sent: 070618/1757z 68032@GB7ESX.#31.GBR.EU $:0E4660GM7HUD [Witham, Esx]NNA V3.1
G0FTD wrote:-
>
> I've just been putting together a simple AGW PTT interface.
>
> On my 25 pin printer port I've used Pin 2 (Data 0) and Pin 25 (ground).
>
> I can see a permanent 5v on it - why ?
Is your parallel port in EPP mode? Is the high a hard high or a soft high?
It could be your parallel port is setup as an input with internal pullups.
That would give you a high reading on a scope or DVM.
Try driving the pin low (through a resistor) and see if the pin follows. If
it does then it's an input. If you get some voltage in no-man's land then
it's an output and something is / has driven it to that state.
Check the bios too and put the parallel port into SPP mode and try again.
You might want to make sure there are no printer drivers trying to use the
port aswell.
Or if you're a bit clueless you could try a full format and re-install of
Windows! ;-)
73 de Andy GM7HUD
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