I found out the cause.
The cause is that multiple python codes that used RevPiModIO are running with systemd.

I've started a new thread about this.
I would appreciate it if you could reply if you know the solution.
I apologize if starting a new thread is a problem.

Thank you for your support.

I'm using a RevPi Connect SE with an MIO module connected. When multiple Python codes importing RevPiModIO are executed simultaneously through systemd, both digital and analog outputs become unstable. I've seen a similar discussion in the forum before, but I remember that it was said that the cause ...

Thank you for your support. The issue with the error message has been resolved. However, the problem of unstable analog and digital output voltage has not been resolved. I changed the power supply unit to one with 24VDC and 2.5A output, but the digital and analog output values still fluctuate betwee...

Hi, thank you for your support. I replaced the problematic RevPi's MIO module with one that was working on another RevPi. Since the same error occurred again, it seems to be a problem with the RevPi itself. On a different note, the reason why the MIO output voltage is not stable may be due to insuff...

Thank you for your reply. 1. Does the I/O address mean the name of each output? I checked PiCtory, and there were no duplicates. I have not changed it from the initial name when I first connected MIO and configured PiCtory. 2. I entered the commands, and here is the output: $ cat /proc/version Linux...

I have connected the MIO module to the RevPi Connect SE and am controlling the inputs and outputs using Python. About a year ago, I was able to control the outputs of the MIO module without any issues using RevPiModIO. However, when I recently tried to control the outputs again, I encountered the fo...

Thank you for your response. I configured PiCtory as follows -IO_Mode_1 = pwmOut -FpwmOut_12 = 299 [200Hz]. -PWM Dutycycle_1 = 304 [30.4%] I have an another question. Maybe I should move it to the RevPiModIO board, but since it's a continuing question, I'll put it here. I want to use RevPiModIO2 to ...

I'm going to PWM control a servo motor using the RevPi MIO's digital output. I have a rudimentary question about the RevPi MIO setup, as it was not included in the tutorial. In the "Value Editor" of PiCtory, the PWM frequency is set to FpwmOut_12, 3, 4. Should the value set to FpwmOut be t...

Thank you Nicolai.
Changing the device path to /dev/ttyRS485 fixed the issue.

I want to control a CEMCO pH controller using RS485 communication with RevPi Connect SE. https://www.cemco.jp/en/water_quality/pet_m3P/ The RS485 socket on the front panel of the RevPi connect SE and the RS485 terminal of the pH controller are connected with a twisted pair cable. A 120Ω termination ...