|
|
|
Junior Member
 
Group: Forum Members
Last Login: 3/2/2010 3:19:02 PM
Posts: 12,
Visits: 25
|
|
So I'm scripting a program that will control a piece of lab equipment through a parallel port. One of the functions that I need to use is supposed to be controlled with pin 20 according to the equipment manual.
Wait a second. I thought that pins 18-25 on a 25pin parallel port were all ground pins. As far as I know, no bit register even contains those pins much less allow you to send a signal through those pins?
So my question is: Is it even possible to write a program/script to send a signal through any of the ground pins from the computer to the target equipment?
|
|
|
|
|
Forum MVP
Group: Forum Members
Last Login: 5/14/2012 4:43:58 PM
Posts: 728,
Visits: 2,932
|
|
leai (2/6/2009)
Wait a second. I thought that pins 18-25 on a 25pin parallel port were all ground pins. As far as I know, no bit register even contains those pins much less allow you to send a signal through those pins?
My understanding as well. There must be something weird with that that equipment or its manual, or it's not really using a parallel port even though it uses a DB25 connector. OTOH, a DB25 serial port connector uses pin 20 for the DTR (Data Terminal Ready) signal. But that would be a whole other kettle of fish.
-- David McFarlane, Professional Faultfinder
|
|
|
|
|
Junior Member
Group: Forum Members
Last Login: 3/2/2010 3:19:02 PM
Posts: 12,
Visits: 25
|
|
Thanks for confirming that. We actually went with a bit of cutting and splicing of a cable, but whatever works 
|
|
|
|
