Node-Red Modbus Error Exception 2

Node-RED
1

Hello,
I am trying to communicate with a VFD over Modbus RTU.
Using Modscan with a USB-Serial adapter and my laptop as master, I am able to view this register:

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However, when I try to do this in Node-Red using the groov Epic and CSERI-4, I get error
“Error: Modbus exception 2: Illegal data address (register not supported by device)”
I have made sure that the VFD has the right communication settings and that the polarity is correct.

Flow:

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image775×62 5.89 KB

Modbus Node Settings:
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Anyone have any suggestions?

EDIT: here is the manual for VFD I am trying to poll https://files.danfoss.com/download/Drives/MG18B522.pdf

2

Have you got a screenshot of the Modbus node settings for the register?
You provided one for the serial port which we think is working.

3

I’m not sure what you mean sorry, an image from Modscan?

4

There are 2 main menus in the modscan node, the register menu and the serial port menu.

5

Looking for a screenshot of the register menu… This one…

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1 Like
6

Ah that’s why I’m so confused, I am using the flex-getter node. Sorry about that.

Also, I restarted node-red through groov manage and it seems to work now. Not sure what was going on before.

7

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