python - 'bytesize' in PySerial module -


i want send messages through serial port using pyserial. 1 of parameters serial constructor 'bytesize'. have been trying serial.sevenbits , serial.eightbits , haven't noticed difference. documentation bit vague , new both python , serial communication. set maximum value byte can hold or signed bytes? can clear why i'd use 7 bits on 8? have been searching haven't found answer.

thank you

this refers number of data bits in each transmitted character. wikipedia:

data bits

the number of data bits in each character can 5 (for baudot code), 6 (rarely used), 7 (for true ascii), 8 (for kind of data, matches size of byte), or 9 (rarely used). 8 data bits universally used in newer applications. 5 or 7 bits make sense older equipment such teleprinters.

most serial communications designs send data bits within each byte lsb (least significant bit) first. standard referred "little endian". possible, used, "big endian" or msb (most significant bit) first serial communications. (see endianness more bit ordering.) order of bits not configurable, data can byte-swapped before sending.


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