You will need the PLC Adapter cable (Part number: JDC 112A) if you wish to perform diagnostics on a standalone trailer without needing to connect it to the tractor to provide power supply, you would also need the PLC Power Supply Adapter Cable (Part number: JDC 40AM2, recommended). Connect the PLC Adapter cable to the corresponding slot, then connect the 9-pin connector in its corresponding location and click on the black 9-pin connector button on the software. Jaltest Software will perform an automatic scan on the ABS system of your trailer and provide the necessary information, depending on the ABS systems.