Problem while reading the data from RS232 using Qextserialport

[calhal]

You are reading two bytes every milisecond without checking if those two bytes are really there to read.

if(port->bytesAvailable())

if(port->bytesAvailable())

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I guess you have here -1 most of the time, but still you're processing the data.
I think 1ms is to often, you're just wasting your OS resources.