#!/usr/bin/python3

import time
import serial

if __name__ == '__main__':

	ser = serial.Serial ('/dev/ttyUSB0', 9600)
	ser.set_output_flow_control(True)
	
	try:
		ser.open()
	except:
		ser.close()
		ser.open()

	time.sleep(1.0)
	print ("RTS = {}, DTR = {}".format(ser.rts, ser.dtr))
	time.sleep(0.5)

	ser.rts = False
	print ("RTS = {}, DTR = {}".format(ser.rts, ser.dtr))
	time.sleep(0.5)

	ser.dtr = False
	print ("RTS = {}, DTR = {}".format(ser.rts, ser.dtr))
	time.sleep(1.0)

	ser.close()

	print ("End of program.")