ERROR Illegal function. help!

[Ataraxiall]

Hi All,

Im trying to get data from Circuitor CEM-C6-MID.

The address is

Voltage addres: 0131
Function 03

my command is

mbpoll -a1 -r313 -b9600 -t4int -c20 -mrtu -F2 -Pnone /dev/ttyS2 -l 500 -v

but it says
ERROR Illegal function Read input register failed: Illegal function -- Polling slave 1... Ctrl-C to stop) [01][04][00][58][00][02][F0][18] Sending request using RTS signal Waiting for a confirmation... <01><84><01><82><C0>

Any help?

Thanks!