Read modbus holing registers

[oyfug]

I am new to Labview and I wish to make some modbus programs

For now I want to read 2 sets of holding registers, I have followed a toturial on youtube https://www.youtube.com/watch?v=m1TB9twXYaA

I dont have a real device so I have set up a modbus slave using Calta modbus simulator and a virtual serial port software.

The master and slave communicates, but I dont get registers values from the slave.

[K C]

Hi,

Connected a ModBus device changed the baudrate and the VI works just fine !!

Kees

[oyfug]

Thank you for testing, it seems that the virtual serial port software I used was not configured correctly.

Tested now with USB-serial adapter and a null modem cable, and i got it to work as well 🙂