Details

Buffer capacity can be changed through the ser.txbuffrq method followed by the sys.buffalloc method.

The ser.txbuffrq requests buffer size in 256-byte pages whereas this property returns buffer size in bytes. Relationship between the two is as follows: ser.txbuffsize=num_pages*256-16 (or =0 when num_pages=0), where "num_pages" is the number of buffer pages that was GRANTED through the ser.txbuffrq. "-16" is because 16 bytes are needed for internal buffer variables. The serial port cannot TX data when the TX buffer has zero capacity.