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+--- Thread: Huawei - Input Register not working (/showthread.php?tid=6527)
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RE: Huawei - Input Register not working - Chandrias - 01.09.2026
I changed my configuration and now I only get this error
RE: Huawei - Input Register not working - Daniel - 01.09.2026
You still have connection problem here. It looks like this inverter accepts only one connection so everything else must be disabled. Send me your backup to PM, I will check if anything else is taking the slot.
RE: Huawei - Input Register not working - Daniel - 01.09.2026
Did you just remove the device from modbus mapper? I can see errors from today but there is no device there. If this is the case then reboot inverter again and see what the script says now.
RE: Huawei - Input Register not working - Chandrias - 03.09.2026
(01.09.2026, 11:36)Daniel Wrote: Did you just remove the device from modbus mapper? I can see errors from today but there is no device there. If this is the case then reboot inverter again and see what the script says now.
Yes, I removed it to test the script. I did reboot the inverter and I still get the same error.
The strange thing, is that when I add the device, I get readings from all registers and still I can not write to 40120 & 40125
RE: Huawei - Input Register not working - Chandrias - 03.09.2026
(01.09.2026, 11:36)Daniel Wrote: Did you just remove the device from modbus mapper? I can see errors from today but there is no device there. If this is the case then reboot inverter again and see what the script says now.
I suspect that the issue is with the Inverter itself.
Can you tell me what changes shall I do to the script in order to test it over RS485?
RE: Huawei - Input Register not working - admin - 03.09.2026
How is Modbus TCP configured on your inverter? Maybe there's some setting that forbids writing.
RE: Huawei - Input Register not working - Chandrias - 03.09.2026
(03.09.2026, 10:31)admin Wrote: How is Modbus TCP configured on your inverter? Maybe there's some setting that forbids writing.
I have no idea what is wrong. The other software is writting over TCP.
That's why I want to try the alternative RS485 route
RE: Huawei - Input Register not working - admin - 03.09.2026
Enable and configure RTU 1 in Modbus tab. Use Read test to check the communication first. Then try this script, change slave id (2) as needed:
Code:
mbproxy = require('mbproxy')
mb = mbproxy.new()
mb:setslave(2)
res, err = mb:writeregisters(40120, 300)
if res then
log('write ok')
else
log('write failed', err)
end