The data address is not an allowable address for the server (or slave).

[micha1983]

HI,

i want to read the following modbus address over TCP.

ID 2
Modbusaddress: 30775

But everytime i get the following errormessage.
can somebofy help me with that?

0x03 (RES) Exception (2): Illegal Data Address: The data address received in the query is not an allowable address for the server (or slave).

with qModMaster.exe i'm able to read the address.
can i adjust the max allowed value somewhere?

thanks for the feedback.

Greetings
Michael

[morkai]

Try

const startingAddress = 30775;
const quantity = 1;
const unit = 2;

master.readHoldingRegisters(startingAddress, quantity, {unit: unit})

This exception is returned as a response from the server. It's not generated client-side.

[micha1983]

Thanks. Is working great.