On a PC, it's relatively simple to send commands from a DOS prompt. Use the 'mode' command to set the port parameters: mode COM1:9600,n,8,1 (sets port to 9600 baud, no parity, 8 data bits, 1 stop bit)
Using the copy command, you should be able to send the contents of a text file to COM1: copy command.txt com1 will send a copy of the file command.txt to COM1
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