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Modbus communication Rs485 DELTA HMI inverted received data?

parth kothiya
Senior

I want to communicate with delta HMI (slave) and STM32 as master device.

Now master(HMI) send data to slave(laptop) I received inverted data.

Slave id is 01 but I received ​7F from hmi

It works well with non inverted data.​

So how can I communicate between DELTA HMI & STM32?

Is delta HMI use any special code?​

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