Issue with Modpoll

when running the command to check connective with energy meter and board it getting something like
:
win\modpoll -m rtu -a 1 -t 4:float -r 159 -b 9600 -s 1 -p even COM8
modpoll 3.6 - FieldTalk(tm) Modbus(R) Master Simulator
Copyright (c) 2002-2018 proconX Pty Ltd
Visit https://www.modbusdriver.com for Modbus libraries and tools.

Protocol configuration: Modbus RTU
Slave configuration...: address = 1, start reference = 159, count = 1
Communication.........: COM8, 9600, 8, 1, even, t/o 1.00 s, poll rate 1000 ms
Data type.............: 32-bit float, output (holding) register table

Serial port already open!
 
The error typically indicates that the PC serial port Modpoll is attempting to use is already in use by another application.

Did you check Device Manager to see which COM port your USB/RS-xxx converter is installed on? Is it installed on COM8?

Do you have a 2nd instance of Modpoll running in the background?

If the PC has an OPC server installed, the COM8 might be used by the OPC server.

See this thread:
https://control.com/forums/threads/communicating-via-schneider-174-cev-300-10.10522/
 
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