To check what port is used by what service. Thereof, how do I know which COM port is connected? In the settings, set it at 19200 baud, 8 bits, No parity, 1 stop bit and no flow control as shown below. NOTE: Each USB RS232 will be assigned a different port number Open any terminal application, such as Windows HyperTerminal and configure it to use the appropriate port (in this case, Port 10).
Download ComTestSerial for free, use it and give it to anyone who has a need for a serial communications test. As an example, we’ll consider testing COM ports with Windows HyperTerminal.
Press Enter when prompted for a password. At the login prompt, type root and press Enter. When you see a blank screen, press the Enter key twice. Configure the PuTTY menu as follows: Under Connection type, select Serial. so u can get what ever u send from ur pc. Apply a right mouse-click on the putty.exe file and select Run as administrator. If you want to check your serial port then u can use loopback testing by connecting d type serial connector with rxd and txd pins shorted. If you are using a USB to Serial Adapter, it will be listed as a "USB Serial Port". for testing hyperterminal u need to use RS232 transmitter like a programmed microcontroller which sends data. If you are using a serial port built into the computer, it will be listed as a "Communications Port". When the device manager shows up, Find the entry that says " Ports (COM & LPT)" and click on the beside it to expand it.