Using 485 for QmodbusServer library
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Hello Everyone,
I am using the QModbusServer library for implementation of slave device. I have tested this library and receive signal from the master device. However there is an issue regarding 485. Since it is a half duplex protocol, we need to switch the mode using GPIO pin.
Using the sample application which is given here . I am using imx6ul series embedded device with a custom Yocto build .
I am receiving correct signal from the master, I am not able to respond because I am not able to switch 485 into transmit mode.
How do I modify this code for 485 communication.
Regards, -
@Chai18 said in Using 485 for QmodbusServer library:
because I am not able to switch 485 into transmit mode
Why not? What happens?
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@Chai18 said in Using 485 for QmodbusServer library:
where in the code do I switch the GPIO pin?
I would say before you respond
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@jsulm Ok, let me rephrase it . QMobusRtuSerial is handling low level serial communication. The class is emitting a signal whenever it receives a frame. Is there a way to modify this behaviour.
In a nutshell where exactly in the code do I put my GPIO pin switch code. -
Maybe you can override QModbusServer::processRequest() and do all work there.
