I have two VMSpc units, an older one and one the newer type. The older one works fine. When I connect the newer one, I get 'Failure between JIB and engine.' I checked the cable (continuity) from the JIB to the coach connector and it is OK. The green light is on steady and the red is flashing rapidly. Com port 4 is selected in VMSpc software and on the computer. Both my two VMSpc units have different cables so I cannot interchange them. Is the JIB not working correctly, failed, etc., and how would I know. What should I check next. I am running Windows XP home on a laptop, with BAFO USB/Serial cable.