/products/arduino/b/blog/posts/rs-232-field-wiring-adapterThe RP-2ADP is an adapter for infield wiring of the DB9 Serial connector. * Allows easy access to the TX, RX, and Ground pins.* The RTS and DTR pins (Pins 4 and 7) are also available for CAN bus or port powered devices.* Tab for wire strain relief.* en-USTelligent Community 12