New interesting 'LPT' device available..

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03 Dec 2023 19:45 #287131 by Solvarg
I stumbled on this neat little 'parallel port creator' www.machmaker.pl/linumeric-lpt-v3-en the other day.
Has anyone of you got any experience on this 'ethernet to LPT' device?

Thanks,
Bert

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03 Dec 2023 20:03 #287135 by Aciera
Not sure, never heard of it, but considering that Versions 1 and 2 were using USB and were also promoted to give you a working LPT interface for LinuxCNC I would be somewhat skeptical.

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03 Dec 2023 22:21 #287147 by cornholio
Looks interesting, seems to be Ethernet to spi to arduino. Unless it’s significantly cheaper than a 7i92, which in effect gives you the equivalent of 2 parallel ports, I know which way I’d jump.
Another thing to consider is that you may need to run a base and servo thread, rather than just a servo thread.
It may fill a need for some people.
Unless someone is willing to take it for a test drive or take a chance it’s all just opinions we can give at the moment.

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03 Dec 2023 23:02 #287148 by PCW
I think ( I guess) how it works is quite clever, Its actually a buffered device
so base thread invocations simply queue read or write operations
in their driver until the servo thread function that does the actual
communications, sending the queued requests. This allows compatibility
with LinuxCNC software components.

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04 Dec 2023 00:15 #287150 by tommylight
The same, but without ETH, from the same guys and this one uses STM32 BluePill.
forum.linuxcnc.org/27-driver-boards/4888...or-is-it-real#269692
The prices are out of this world, and they insist on keeping it secret, i hate that.
Go buy a Mesa and enjoy using it.
Those LPT thingies are much slower, have less IO, but cost more than Mesa !?!?!?

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04 Dec 2023 01:00 #287154 by cornholio
More ?

Surely not ?

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04 Dec 2023 01:25 #287155 by tommylight
Found it:
forum.linuxcnc.org/27-driver-boards/3977...terface-for-linuxcnc
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67$ for 17 limited pins
89$ for 34 very fast pins that can do input or output on all pins
So yes, it is more expensive, by a lot.
Should have been 40, that would be very reasonable for someone in need of parallel port

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04 Dec 2023 02:39 #287157 by cornholio
Holy cow batman.

I guess there would be a device driver in the middle of it all that virtualises the parallel port. In the spirit of linux one would guess that would be open source.
The following user(s) said Thank You: tommylight

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04 Dec 2023 15:27 #287198 by Solvarg
Not sure where you got touse prices from but they seems to provide all you need to make one your self.
Schematic, BOM, Gerber files, programming instructions and software in a binary. So no open source but still...

It's a quite simpple design and I'm tempted to make my own PCB with levelshifters/isolators included so that you don't need another BOB to interface with the motor drivers.

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04 Dec 2023 17:19 - 04 Dec 2023 17:20 #287204 by drewnabobber
We did a fully-open source Remora controller for these type of simple LPT based machines. It uses the Ethernet component as a fully real-time device, not buffered.

github.com/Expatria-Technologies/PicoBOB-DLX

All design and manufacturing files are posted there.
Last edit: 04 Dec 2023 17:20 by drewnabobber.

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