dump from CMS 50F 3.7

#!/usr/bin/python

#cf. http://elinux.org/Serial_port_programming

import serial
import sys

#port = serial.Serial("/dev/ttyUSB1")



def send_cmd(p, c):
	print "> %s" % c
	c = c.replace(' ', '')
	c = c.decode("hex")
	#print c.encode("hex")
	p.write(c)

def recv_data(p, l):
	data = ''
	for i in range(l):
		print "waiting for byte"

		d = p.read(1)
		print "< %s" % d.encode("hex")
	data.append(d)
	return d

if len(sys.argv) < 2:
	print "Usage: %s serialdev" % sys.argv[0]
	exit(1)

with serial.Serial(sys.argv[1], 19200) as p:
	print p.isOpen()
	send_cmd(p, '7d 81 a7 80 80 80 80 80 80')
	recv_data(p, 2)
	send_cmd(p, '7d 81 a2 80 80 80 80 80 80')
	recv_data(p, 2)
	send_cmd(p, '7d 81 a0 80 80 80 80 80 80')
	recv_data(p, 4)