helloworld.py
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	#!/usr/bin/python
	# -- coding: utf-8 --
	import os, sys

	# add ../../Sources to the PYTHONPATH
	sys.path.append(os.path.join("..", "..", "Sources"))
	from yocto_api import *
	from yocto_relay import *


	def usage():
	scriptname = os.path.basename(sys.argv[0])
	print("Usage:")
	print(scriptname + ' <serial_number> <channel> [ ON \| OFF ]')
	print(scriptname + ' <logical_name> <channel> [ ON \| OFF ]')
	print(scriptname + ' any <channel> [ ON \| OFF ]')
	print('Example:')
	print(scriptname + ' any 2 ON')
	sys.exit()


	def die(msg):
	sys.exit(msg + ' (check USB cable)')


	if len(sys.argv) < 3:
	usage()

	target = sys.argv[1].upper()
	channel = sys.argv[2]
	state = sys.argv[3].upper()

	# Setup the API to use local USB devices
	errmsg = YRefParam()
	if YAPI.RegisterHub("usb", errmsg) != YAPI.SUCCESS:
	sys.exit("init error" + errmsg.value)

	if target == 'ANY':
	# retreive any Relay then find its serial #
	relay = YRelay.FirstRelay()
	if relay is None:
	die('No module connected')
	m = relay.get_module()
	target = m.get_serialNumber()

	print('using ' + target)
	relay = YRelay.FindRelay(target + '.relay' + channel)

	if not (relay.isOnline()):
	die('device not connected')

	if relay.isOnline():
	if state == 'ON':
	relay.set_output(YRelay.OUTPUT_ON)
	else:
	relay.set_output(YRelay.OUTPUT_OFF)
	else:
	die('Module not connected')
	YAPI.FreeAPI()