Which JIB model do I have?

JS540 Bluetooth / JS550 WiFi JIB
These two look identical from the outside. They're functionally the same as the JS501 though you see there's just the single 12-pin connector.
TM-540-550

JS501
The JS501 is the current USB version in the VMSpc kit. It has a USB port and two engine communications modes available (J1708 & J1939) in a single 12-pin connector.
VMSpc_USB

JS500
The JS500, sometimes also referred to as the "Classic" JIB, is the predecessor to the JS501 JIB. It has a 9 pin serial connector and supports the J1708 engine data bus.
VMSpc_Serial

Original JIB
The first JIB sold. It is functionally the same as the JS500. It just has different connectors on it. For the purpose of this FAQ follow the JS500 directions.
VMSpc_original_JIB