#71 QModMaster Can not connect under RS485 RTU mode

[Anonymous]

Dear Sir
When I use QModMaster (I have try qModMaster-Win32-exe-0.5.2-3 And qModMaster-0.5.3-beta), com port, baud rate is correct, but ModBus RTU cannot complete connection and always report “Unable to create the Libmodbus context”
What is the problem and how to solve it?
I have test Modbus by another software called “MODSCAN” it is works correctly, so external hardware and connection has no problem.
Please guide me.

My mail box is jinguangyao1974@163.com

[Anonymous]

When I use another modbus Master software, Modbus RTU is works, so hardware and physical connection are correct.

[Anonymous]

problem solved, the reason is, in file "qModMaster.ini" "Parity=" has no value.
When add value "N" then connection is completed.
[RTU]
SerialDev=COM
SerialPort=3
SerialPortName=COM3
Baud=9600
DataBits=8
StopBits=1
Parity=N
RTS=Disable

[elbar]

Thanks for your feedback.

Normally if you delete 'qModMaster.ini' when you start again the application a new 'qModMaster.ini' will be created with default values.

Best Regards