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Read Multiple Salves from Modbus RTU Master

Posted: 17 Jul 2025, 18:05
by sabooh
Hi

I am using RevPi4.

i can read sensors over RS485 Modbus RTU.

However, there seem like an issue reading multiple slaves.

two slaves with different address added
r2.png
I want to read 8 registers from address 10.
r4.png
I think there is some issue with offset/length

Second sensor address is not transmitted and only able to read one sensor (only the one at Action ID 1)

Re: Read Multiple Salves from Modbus RTU Master

Posted: 11 Sep 2025, 19:11
by tsm
Have you tried to change the register address from 10 to 9 whether it makes any differences?