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RS485 to external Modbus RTU board

Other Peripherals

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M
mikacz last edited by
I have Patron L207 and I'm trying to establish communication with following external Modbus RTU relay board

I tried this:
```
mbpoll /dev/extcomm/0/0 -m rtu -a 1 -b 9600 -c 8 -P none
```
But I get
```
Read output (holding) register failed: Connection timed out
```
Any hints on wwhat I am doing wrong? I have no experience with RS485 so I am totally stuck.
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