Parallel Port Tester

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10 Aug 2021 16:18 #217408 by tommylight
Replied by tommylight on topic Parallel Port Tester
I do have a 3M long parallel port cable that works properly, it is thick and heavy though.
I also have a 5M that is not a standard parallel port cable despite having DB25 connectors on both sides, it has only 8 wires and ground, it was used to transfer data reliably in the age of floppy drives. And those wires are wired from pins 2-5 they go to pins 10-13 on the other side, same on both ends.
Might be you have such a cable.

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11 Aug 2021 07:57 #217481 by jsven
Replied by jsven on topic Parallel Port Tester
Hi,
I've attached the schematics and a picture of the card.

I've measured the cable and everything with the cable looks ok.
What i will do now is to try the card directly on the port and test.

Maybe I have to weak pullups, but lets see.

BR
Johan   

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11 Aug 2021 09:30 - 11 Aug 2021 09:30 #217496 by jsven
Replied by jsven on topic Parallel Port Tester
Looking through the schematics I think I know what I've done wrong.

I managed to shift the D-sub pinout one step on the higher pin numbers 14 -> 25.

I will try to correct this on the board and then try the card once more.

After that I need to make a new layout.

I will make some additional changes and incorporate 2 DC/DC converters for the 5 and 12 V so I can run the board on 24V.

If anyone is interested in this board I can  hand over all the new documentation and gerber files.
I'm also able to make some additional cards if there is a big interest.

BR
Johan
Last edit: 11 Aug 2021 09:30 by jsven.

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11 Aug 2021 09:43 #217498 by tommylight
Replied by tommylight on topic Parallel Port Tester
If you power both sides of the BOB with a single power supply you loose isolation, and that is the main purpose of a BOB.

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11 Aug 2021 14:38 - 11 Aug 2021 14:40 #217549 by jsven
Replied by jsven on topic Parallel Port Tester
I'm not powering the BOB with 1 supply, please look at the schematics.
I have an isolated dc/dc converter on the computer side.

I will add 2 new dc/dc converters for the CNC side.
In total this makes 3 dc/dc converters after my redesign of the board.

Then I'm able to use 1 ac/dc mains supply of 24V for all...

BR
Johan
Last edit: 11 Aug 2021 14:40 by jsven.

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11 Aug 2021 15:13 - 11 Aug 2021 15:46 #217553 by jsven
Replied by jsven on topic Parallel Port Tester
Hi all,

With the pin change, the board is working just fine...

And now I have a working board with a built in NPN proximity sensor solution, thanks all for your help.

BR
Johan
Last edit: 11 Aug 2021 15:46 by jsven.

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