python_serial_test.py

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#!/usr/bin/env python
 
import serial, sys
 
if len(sys.argv) != 2:
    print "python: Usage_serial_test <port name like: /dev/ttyUSB0>"
    sys.exit(1)
 
sio = serial.Serial(sys.argv[1], 115200)
sio.timeout = 250
 
while True:
    sio.write("Testing.")
    print sio.read(8)