Read Multiple Salves from Modbus RTU Master

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sabooh
Posts: 1
Joined: 06 Jul 2025, 16:04

Read Multiple Salves from Modbus RTU Master

Post 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)
tsm
Posts: 17
Joined: 13 Nov 2020, 10:42

Re: Read Multiple Salves from Modbus RTU Master

Post by tsm »

Have you tried to change the register address from 10 to 9 whether it makes any differences?
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