Stm32f401re serial port 6 issue

Hello Experts

Need some help with serial port

I have been trying to communicate on serial 6 with MAX485 on Siemens V20 VFD drive.

When I send command on Modbus it is received by the slave and slave responses properly as seen in my logic analyser.

But when I read, the first byte read is always 0x00 and the second byte is the actual first byte.

Has anyone faced this issue. Could anyone help please.

Thanks

Murali

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