chr(27) + chr(112) + ... or chr(0x1b) + chr(0x70) + ...

You can use the MSCOMM control to talk to the serial port to send it the above strings.

>How can I send the following control codes to a port on my computer to get a cash draw to pop open. decimal = 27-112-0-64-240
>or hexidecimal=1B-70-00-40-F0.