Binary data with pyserial(python serial port)

An alternative method, without using the array module:

def a2s(arr):
    """ Array of integer byte values --> binary string
    """
    return ''.join(chr(b) for b in arr)

You need to convert your data to a string

"\xc0\x04\x00"

Null characters are not a problem in Python -- strings are not null-terminated the zero byte behaves just like another byte "\x00".

One way to do this:

>>> import array
>>> array.array('B', [0xc0, 0x04, 0x00]).tostring()
'\xc0\x04\x00'

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