What do the LEDs on the JIB tell me?

The green LED should be on solid when the JIB is powered. The red LED should flash indicating that it is alive and running.

Specific red LED blinking behavior depends on the model of JIB.

JS500:
VMSpc_Serial_side.JPG

Slow blink: JIB is not receiving engine data
Fast blink (flicker): JIB is receiving engine data

JS501:
VMSpc_USB_side.JPG

The JS501 may be connected to one or two different engine data busses. They are referred to as J1708 and J1939.
Single blink: JIB is not receiving engine data
Double blink: JIB is receiving J1708 data
Triple blink: JIB is receiving J1939 data
Flicker: JIB is receiving data from both data busses