Rs232 loopback tester7/10/2023 ![]() ![]() Locate pins 2 and 3Ī magnifying glass may be required to read the numbers on the inside base of the connector. If necessary, consult your computer's manual, or contact their technical support department. ![]() If you have 2 serial ports, identify if it is COM1 or COM2. Remember, a PC's RS-232 port can be 9-pin or 25-pin, but will always be a male connector (containing pins, not sockets). It is, however, similar for other computers) Identify your serial port (these instructions are for an IBM or compatible. To perform a "Loop-Back" test, follow these simple steps. A printer port is always a 25-pin female connector. One important thing to remember is that an RS-232 port on an IBM or compatible PC is always a male connector, and may be either 9 or 25-pin. It is a common mistake to connect a serial device to the printer port, since many believe this to be a 25-pin RS-232 port. ![]() There is one very simple test that will help simplify the task of troubleshooting your RS-232 system, which is sometimes called the "Loop-Back" test.īasically, this test will verify that your PC's serial port is working properly, and that the RS-232 software that you are using is operating correctly, and that you are connected to the proper port. Among them are correct baud rate setting for the device, proper software configuration and proper cabling. There are many factors involved in communicating with an RS-232 device from a PC.
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