As an AV professional, this saves a lot of time when troubleshooting RS232/serial control. This eliminates the need for guessing if the TX and RX have been swapped, and for pulling out your multimeter and trying to juggle DB9 test leads and cables in your hands with a flashlight. My only issue that I and others who have reviewed this product have had is an issue with the screw that prevents it from being plugged into a device such as a TV's RS232 port for the serial TX pinout determine. This is easily solved by replacing them with screws. Great product, I will buy again!
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