Neuron M303, My Digital Input is not working

[AllanL]

I bought a UniPi Neuron M303 a year ago.
My plan was to connect all my door and window magnetic switches in houses to this device and use it as alarm points in my smart home from Logic Group.
I have installed EVOK and updated it to the latest version.

Unfortunately, I have not succeeded in getting the inputs to show a status other than Off.
I have tried putting a wire directly from ground to an input.
The M303 does not respond to it by turning on the corresponding LED.
I can't see it in the web interface either.
Is there something I'm doing wrong

A little more info
Watch gives no trace
"watch -n 0.1 cat /run/unipi/io_group1/di_1_01/di_value"

I have also tested the debounce time and that is 50ms
"unipi@M303-sn28:~$ mbpoll 127.0.0.1 -a 0 -0 -1 -r 1136 mbpoll 1.4-25 - FieldTalk(tm) Modbus(R) Master Simulator
Copyright © 2015-2019 Pascal JEAN, https://github.com/epsilonrt/mbpoll
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions; type 'mbpoll -w' for details.

Protocol configuration: Modbus TCP
Slave configuration...: address = [0]
start reference = 1136, count = 1
Communication.........: 127.0.0.1, port 502, t/o 1.00 s, poll rate 1000 ms
Data type.............: 16-bit register, output (holding) register table

-- Polling slave 0...
[1136]: 50

unipi@M303-sn28:~$ mbpoll 127.0.0.1 -a 0 -0 -1 -r 1137
mbpoll 1.4-25 - FieldTalk(tm) Modbus(R) Master Simulator
Copyright © 2015-2019 Pascal JEAN, https://github.com/epsilonrt/mbpoll
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions; type 'mbpoll -w' for details.

Protocol configuration: Modbus TCP
Slave configuration...: address = [0]
start reference = 1137, count = 1
Communication.........: 127.0.0.1, port 502, t/o 1.00 s, poll rate 1000 ms
Data type.............: 16-bit register, output (holding) register table

-- Polling slave 0...
[1137]: 50

unipi@M303-sn28:~$ mbpoll 127.0.0.1 -a 0 -0 -1 -r 1130
mbpoll 1.4-25 - FieldTalk(tm) Modbus(R) Master Simulator
Copyright © 2015-2019 Pascal JEAN, https://github.com/epsilonrt/mbpoll
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions; type 'mbpoll -w' for details.

Protocol configuration: Modbus TCP
Slave configuration...: address = [0]
start reference = 1130, count = 1
Communication.........: 127.0.0.1, port 502, t/o 1.00 s, poll rate 1000 ms
Data type.............: 16-bit register, output (holding) register table

-- Polling slave 0...
[1130]: 50
"

[AVsetula]

Hi @AllanL,

From your description, I assume it's a wrong connection. The digital inputs on our units are not potential-free, but instead respond to voltages in the range of 7 to 35 VDC. At the same time, it is necessary that the negative pole of the voltage source is connected to DIGND.

More information can be found in the article dedicated to digital inputs:
https://kb.unipi.technology/en:hw:02-neuron:description-of-io:01-description-of-di

Best regards,
Antonin