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OO extra byte receive RTS high to low on FSK_OUT pin

we use a DS8500 as a HART modem in our transmitter.

we receive a extra 00 byte on FSK_OUT(DS8500) when RTSpin(DS8500)high to low.

For example:

String put on Din(DS8500): 12 11 AB 45 22 8A
receive string on FSK_OUT(DS8500):00 12 11 AB 45 22 8A
first extra 00 byte receive at the start of frame

we discard that byte or what can we do?

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