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This function will return the amount of space used in the serial buffer for the specific serial port. The returned value is on a scale between 0 and 1000 (permille). The exact size of the receive buffer is specified in the help section for serFrameReceiver().
port : SINT (0..127) (default 0)
Selects which serial port to use.
This is the amount of space used in the serial buffer for that port, 0..1000 per-mille.
FUNCTION serGetBufferLevel : INT;