Blast out some commands to COM0, pausing every once and a while.

strobe.py

import sys, os, time
import serial

ser = serial.Serial(port='COM0',baudrate=115200, timeout=1)
# class TestSerial:
#     def write(self, msg):
#         print "GOT: " + msg
# 
# ser = TestSerial()

if __name__ == "__main__":
    if len(sys.argv) < 2:
        print "Usage: strobe.py <file>"
        sys.exit()

    with file(sys.argv[1]) as f:
        line = f.readline()
        while line:
            if "sleep" in line.lower():
                _, delay = line.split(' ')
                delay = int(delay)
                print "Sleeping for %s milliseconds" % delay

                time.sleep(delay/1000.0)
            else:
                print "Sending: " + line[:-1]
                ser.write(line)

            line = f.readline()

        print "DONE"

test.txt

z 10000 10000
m 100 100
sleep 500
z 1000 1000
m 200 200
sleep 100
z 100000 100000
m 1000 100
sleep 1000