The J1939 multiple ECU simulator provides a professional OBD development platform which allow the user to test the OBD functionality on the table. Simulates a Truck ECU . Using 5 potensiometer , 5 live data can be changed and some fixed PNG values are provided. Pressing DTC bouton the trouble codes are generated and the MIL LED is ON. DM11 commands clear the DTCs and the MIL LED. Connection to the tester is provided via a J1962 female OBD port . it needs an external 24 V power supply . More information you can get from the corresponding chipset datasheet.