Python function for sending DMX via the Rascal

dmx.py

def sendDMX(data):
    import serial

    # Make a DMX packet out of the data

    dmxPacket = chr(0x00) + ''.join(chr(element) for element in data)

    # To create sync signal (break and mark after break, in DMX-speak),
    # slow port down and send a long 0

    slow = serial.Serial('/dev/ttyS1', 19200)
    slow.write(chr(0x00))
    slow.close()

    # Sync done; send out the data

    fast = serial.Serial('/dev/ttyS1', 250000, stopbits=serial.STOPBITS_TWO)
    fast.write(dmxPacket)
    fast.close()

# Usage example
#
# >>> import dmx
# >>> dmx.sendDMX([0xAA, 0x55, 0x01, 0x81])