Ok, the app is ready for you to test.
It is a small (<40KB) windows application that allows you to configure a com port as well as the command(s) you would like to send. You can save each individual command configuration in a file. If you turn on the AutoSend feature then when you run the exe and pass the file as a parameter it will send the command and exit the app. This should allow you to configure any commands you like and create batch files to execute them.