CMD Batch file

Hi
I want a batch file to be run in cmd prompt, the batch file job will be:
1-reading a saved text file which contain binary data for a stepper motor driver.
2-send 4 Byte from that text file to the stepper driver through serial port.
3-wait for the driver response that is \"S\" symbole this is mean it's ready for the next job.
4-send another 4 Bytes from the text file.
5-continue till the end of the text file.