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_currentloopoutput import *


	def usage():
	scriptname = os.path.basename(sys.argv[0])
	print("Usage:")
	print(scriptname + ' <serial_number> value')
	print(scriptname + ' <logical_name> value')
	print(scriptname + ' any value ')
	sys.exit()


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


	errmsg = YRefParam()

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

	target = sys.argv[1]
	value = float(sys.argv[2])

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

	if target == 'any':
	# retreive any currentLoopOutput
	loop = YCurrentLoopOutput.FirstCurrentLoopOutput()
	if loop is None:
	die('No module connected')
	else:
	loop = YCurrentLoopOutput.FindCurrentLoopOutput(target + '.currentLoopOutput')

	# we need to retreive the second loop from the device
	if not loop.isOnline(): die('device not connected')

	loop.set_current(value)

	loopPower = loop.get_loopPower()

	if loopPower == YCurrentLoopOutput.LOOPPOWER_NOPWR:
	print("Current loop not powered")
	elif loopPower == YCurrentLoopOutput.LOOPPOWER_NOPWR:
	print("Insufficient voltage on current loop")
	else:
	sys.exit("current loop set to " + str(value) + " mA")
	YAPI.FreeAPI()