Some devices that you are communicating with require a special character to terminate the string of characters you are sending to it. For example, a modem needs a carriage-return (CR) at the end of the string you send to it before it will be recognized. Some devices may require a carriage-return and a line-feed character, others perhaps something entirely different. Please be aware of the requirements of the device you are communicating with. If you require hardware handshaking on the communications port, please see the SetComPortRTSDTR command.
Description: This is the COM port to send the data on or the resource number of the port to send data on if OpenComPortEx was used to open it.
Description: This is the actual data to send out the COM port.