02-04-2008 09:17 AM
02-05-2008 11:28 AM
02-08-2008 09:08 AM
02-11-2008 01:33 AM
Hi,
To be able to monitor your parallel port data you have to 'catch' the writes to the parallel port.
With Win3.1 (just like MsDos) you can write directly or indirectly to your ports. If a program writes directly to your parallel port you cannot monitor the parallel port data with a software monitor. If your program writes indirectly you can monitor the data if you can find a tool on the internet to do this.
I will look into my old software this week, but I have to digg very deep to get there
02-11-2008 08:24 AM
02-11-2008 10:18 AM
Hello all.
I put a this thread: http://forums.ni.com/ni/board/message?board.id=70&thread.id=8155 asking for the same: Is there a way to get the parallel port data in another computer using a DAQ or another NI hardware?
Thanks.
Carlos Nava.
02-12-2008 10:16 AM
02-12-2008 01:08 PM
02-12-2008 06:15 PM
Hi Aro... the cable has to be wired the way the software is written to capture the data. The parallel printer port (Centronics mode) has 8-lines for data (access via DATA Port), 5-lines for status (access via STATUS Port), and 4-lines for control (access via CONTROL Port). The 8-lines for data would be straight thru. You can decide how to swap the status lines with the control lines whichever way your software is written. What you need to keep in mind is the way that your Win 3.1 computer outputs a byte to the printer port (using Centronics mode):
1. Write a byte to the DATA Port.
2. Check to see if the printer is busy (from the STATUS Port).
3. Bring the Strobe line (from the CONTROL Port) low to tell the printer (and your software) that the data is valid on the DATA Port.
4. Bring the Strobe line high to conplete the hand-shaking.
02-13-2008 08:20 AM