Parallel Port Tester

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28 Aug 2020 13:14 #179829 by tommylight
Replied by tommylight on topic Parallel Port Tester
Picture of the parallel port card where the chip can be clearly seen ?
Not from the internet, take a picture of your card.

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28 Aug 2020 13:49 - 28 Aug 2020 13:55 #179834 by shortcircuit48
Replied by shortcircuit48 on topic Parallel Port Tester
Hopefully I can attach pictures

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I despair

There is a single chip, CH351Q
Last edit: 28 Aug 2020 13:55 by shortcircuit48.

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28 Aug 2020 14:08 - 28 Aug 2020 14:11 #179837 by shortcircuit48
Replied by shortcircuit48 on topic Parallel Port Tester

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28 Aug 2020 14:13 #179838 by shortcircuit48
Replied by shortcircuit48 on topic Parallel Port Tester

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28 Aug 2020 18:28 #179864 by tommylight
Replied by tommylight on topic Parallel Port Tester
Well, that will most probably not work.
Try to find something with the MosChip or NetMos on the chip, they always worked for me and are usually 15 to 20$ a piece.

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28 Aug 2020 18:50 #179869 by shortcircuit48
Replied by shortcircuit48 on topic Parallel Port Tester
Great, Tommy and thanks very much and you have saved me a lot of anxiety and I can stop going round in circles. Will now look for a card.
As a slight change in subject when I did the latency test from the hard drive it was horrendous, 30,000,000 +. I am now running on a USB flash drive and it appears ok although mouse can be a bit erratic. The drive is USB 3 and will I benefit from going to USB 3.1(I think)?

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28 Aug 2020 20:13 #179876 by tommylight
Replied by tommylight on topic Parallel Port Tester

As a slight change in subject when I did the latency test from the hard drive it was horrendous, 30,000,000 +. I am now running on a USB flash drive and it appears ok although mouse can be a bit erratic. The drive is USB 3 and will I benefit from going to USB 3.1(I think)?

That is almost always a sign of a failing hard drive or it's controller.
Just in case, did you check if the mother board has a parallel port header ?

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28 Aug 2020 20:33 #179879 by shortcircuit48
Replied by shortcircuit48 on topic Parallel Port Tester
Yes
1 full-height PCI 2.3 slot•2 full-height PCIe x1 slots•1 full-height PCIe x16

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10 Aug 2021 08:36 #217386 by jsven
Replied by jsven on topic Parallel Port Tester
Hi all,
I'm building a new machine and it seams that I cant get the parallel port working correctly.
I have 3 pins that don't perform at all.
The BOB I've built my self and running it stand alone it works.
The pins not working is PIN  14, 15 and 16 (2 outputs and 1 input) 
In the computer with the latest LinuxCNC installed there are 2 parallel ports the one on the mainboard and a PCI parallel card.
Both behave in the same way.
Between the BOB and parallel port I have a 5 meter cable.

Does anyone have a clue to why it's not working?

BR 
Johan

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10 Aug 2021 12:36 #217394 by Todd Zuercher
Replied by Todd Zuercher on topic Parallel Port Tester
5 meters of cable is a long run for parallel port operation. It is possible this could be part of your problem. Have you double checked that your cable wiring is complete and separate for all pins (no pins sharing wires.)

Is there a problem with your breakout board design? Could you describe how it's constructed? What do you mean by "stand alone it works"? How are you testing it "stand alone"?

Parallel ports do a much better job of sinking current than sourcing it. You should take advantage of that when designing your breakout board, so that the BOB and not the parallel port is the source of the signal currents. This adds some complexity since two separate current sources will need to be supplied to the BOB if isolation is desired.

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