all info from: http://www.microridge.com/comtestserial.htm
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Connect your serial device to a serial communications test program such as ComTestSerial.
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Press the send button on your serial device to send information to ComTestSerial or send a command from ComTestSerial to your serial device.
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Find the manual for your serial device to determine what the baud rate and communications parameters should be
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If you have multiple serial ports on your PC, change the serial port within ComTestSerial to determine which serial port your device is connected to.
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Refer to the Help Troubleshooting Section in ComTestSerial for additional suggestions.