Modbus Serial Comms

Having problems ? let us know the details here
Post Reply
Posts: 1
Joined: Mon Jun 20, 2022 9:49 pm

Modbus Serial Comms

Post by AVandyke »

Hello. I have only just started using the picoScope. I am not sure if I am using the probes correctly? I am trying to read Modbus data. The data is only being sent as a burst, not continuously. I want to see the graph data so that I can see the function code, address, and modbus value. But as soon as I put the probe on the signal line I loose the graph data.
I did notice that if I do not put the probe on the data line, I can see the frame data being captured for small bursts of noise on the gnd wire. Some help and advice will be most appreciated.

Advanced User
Advanced User
Posts: 141
Joined: Mon Nov 26, 2012 9:16 am
Location: Netherlands

Re: Modbus Serial Comms

Post by bennog »

message looks to short for modbus ASCII possibly modbus RTU.

Can you post a .psdata file ?


Post Reply