The Industrial Raspberry Pi Forum

Hello,

for our project we used Revolution PI Connect (Operating System: Debian GNU/Linux 11 (bullseye), Kernel: Linux 6.1.46-rt13-v8) with DIO module.
When reading statuses sometimes communication between PI and DIO module is interrupted.
The system reports the following errors:
[852886.893917] pi-bridge serial1- 0: receiver head error in io-req
[852886.893930] piControl: DIO addr 32: communication failed (req:6,ret:-5)
[853847.504857] pi-bridge serial1-0: receiver head error in io-req
[853847.504871] piControl: DIO addr 32: communication failed (req:6,ret: -5)
[855768.834127] pi-bridge serial1-0: receiver head error in io-req
[855768.834142] piControl: DIO addr 32: communication failed
[855768.846441] pi-bridge serial1-0: data reception error in io-req(len: 6)
[855768.846456] piControl: DIO addr 32: communication failed (request:6,ret:-5)

What can I do to fix this problem?
I am attaching the full kernel.log.

Best regards,

Michal

Hi Michal, can you send an update picture of the setup? Try to perform a firmware update:
https://revolutionpi.com/en/tutorials/i ... are-update
How often does the error occur?

Hi, errors occur within minutes to hours (information from kernel.log) .
Only the DIO module is connected to the RevPi on the right side.
Device List:
2 devices found:
Address: 0 module type: 136 (0x88) RevPi Connect 4 V1.0
Module present
input offset: 0 length: 6
output offset: 6 length: 7
Address: 32 module type: 96 (0x60) RevPi DIO V1.5
Module present
input offset: 13 length: 70
output offset: 83 length: 18

Hello --michal-, can you try placing the RevPi DIO module on the left side of the RevPi Connect 4 module? To do this, you must also adjust the PiCtory configuration. However, you can drag the module over to the left-hand side here. At the end you have to execute File -> Save as default configuration and Tools -> Reset Driver.