On 1/9/26 18:26, Viesturs Lācis wrote:
Ok, got that tested, so far so good.
7i37 disconnected, LinuxCNC not running - all pins were 5V. Started
LinuxCNC - all pins still were 5V. Did turn those 5 pins on, they went
to 10-30mV range, so that seems to be right for me.
I definitely do not want to take out the 7i37 board - it literally has
2x 7i39, my diy optoisolator board and THCAD on top of it on some
spacers. And with 12+ years old wiring I am not sure I want to touch
anything there. Adding those few wires for outputs on 7i37 already
ended with soldering to put back the input signals on 7i37. Control
side of the SSR relay is 4-32 VDC. What are possibilities to drive
this SSR with 5i24's pin:
https://www.tme.eu/en/details/ssr-2528zd3/one-phase-solid-state-relays/qlt-power/
From the documentation I understand that control signal at 5VDC will draw 13mA
I'm doing it 5 or 6 times in my setups, among other things controlling
the 255 volt power to 3 machines & high voltage bed power to 3 printers..
Viesturs
ceturtd., 2026. g. 8. janv., plkst. 19:17 — lietotājs Peter Wallace
(<[email protected]>) rakstīja:
On Thu, 8 Jan 2026, Viesturs L?cis wrote:
Date: Thu, 8 Jan 2026 16:25:36 +0200
From: "[UTF-8] Viesturs L?cis" <[email protected]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: "Enhanced Machine Controller (EMC)" <[email protected]>
Subject: [Emc-users] Mesa 7i37TA outputs not working in 13 years old router
Hello!
My DIY router has finally reached the age where it can be trusted to
turn the tool on and off from LinuxCNC. So far I did it manually but
the thing is that instead of milling motor I want to attach foam
cutting thing that is not supposed to be on all the time so I wanted
to drive it with SSR.
There are 5i24 and 7i37TA boards, inputs are running fine but this is
the first time I want to use an output. In HAL file I have:
setp hm2_5i24.0.gpio.065.is_output 1
setp hm2_5i24.0.gpio.065.invert_output 1
setp hm2_5i24.0.gpio.065.is_opendrain 0
and later I added the same for pins 66,67,68,69,70 and 71 just for
testing purposes
I have wires attached to pins 65,67,69: 12V DC to out1+, SSR+ on out1-
and GND on SSR-, the rest are just free wires where I am trying to
measure if voltage higher than 10mV will appear.
And I cannot get any single output to work. Could it be that 7i37 is
too old? Is there a way to check if actually 5i24 pins change their
state? Cables on 5i24 are attached from bottom, so little pins are
protruding on top and 7i37 is attached to the outer plug, so I could
try to check there with multimeter if I knew what voltage levels
should I look for. I tried already for last 9 pins on that connector
and what I saw did not make much sense to me. Some pins were 5V, some
were 2,8V some were 0.03V although they should had been the same.
Any hints for somewhat reliable test method are appreciated.
Viesturs
I would first check tha the 5I24 is OK
Without running LinuxCNC and with the 7I37 disconnected
and the default P2 (I/O 48..71) jumpering = W1 up, W2 left
You should measure 5V on all 5I24 GPIO pins
That is, P2 pins 1..47 (Pin 1 has a square pad)
connector pins are numbered:
1 2 (1 has square pad)
3 4
5 6
7 8
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Peter Wallace
Mesa Electronics
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Cheers, Gene Heskett, CET.
--
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-Ed Howdershelt (Author, 1940)
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