import serial,time s = serial.Serial('/dev/ttyS0') bm = '01000101' bitzeit = 0.2 s.setRTS(0) time.sleep(0.005) # Startbit s.setRTS(1) time.sleep(bitzeit) # Datenbits for i in range(8): s.setRTS(int(bm[i])) time.sleep(bitzeit) # Stoppbit s.setRTS(0) time.sleep(bitzeit) s.close()