Long Parallel port cable for HD44780

Dwiel · 04-09-2004, 09:11 PM

Hello, I was wondering how long the cable connecting to an LCD display can be under normal circumstances? I have mine connected up to an extra long cable, and it doesn't seem to be getting any signals from the parallel port... I am going to try connecting it to my other computer, but I would like to know if length of the cable might be a factor in my problem.

Thanks!

Dwiel

Dwiel · 04-09-2004, 10:02 PM

I have checked the wiring a million times time according to the popular diagram: http://www.myrolypoly.com/lcd_projec...s/lcd-db25.gif
All of the data pins have 0 resistance across them.

I have tried using MPXPLAY running in dos, and the LCD plug-in for winamp to no avail. I tried slowing down the speed at which the plug-in sent data over the line which also didn't work.

Does anyone know what else might be going wrong?

The specs of my LCD can be found here: http://www.mpja.com/download/14194op.pdf

No where in the specs does it say that it is hd44780 compatible, but I've seen places online claim that they are. I also looked and teh commands are exactly the same as an hd44780.

Thanks for the help!

felix99 · 04-10-2004, 07:28 AM

I have a lcd cabeld with 5m of cable - but it only works on old amchines - it depends on the power transmitted by the lpt port- in fac tolder mainboards deliver more power so longer cables can be used - on my actual pcs the lcd with 5m of cable doesnt work at all - but some with 2m or 3m work well.