[TG] [TG11] Lighthouse II Diagnostics Feature

[Tom - Raymarine - Moderator]

Hi Bob,

Each time you do 'Select Device' in the MFD's diagnostic menu, that sends an NMEA2000 Request message asking all devices to reply with their Product Information PGN. The request and response as one-shot messages, so much more likely to be affected by a network problem than repetitive (standard nav-data) messages. It might be that you have a slight problem with your STNG network (too many or too few functioning terminators, multiple power supplies, a malfunctioning device connected to the network, a crimped/twisted/corroded/loose cable or connector etc.) that's corrupting a proportion of messages. If that were the case it's probably a subtle-enough problem that it won't show up to a casual examination of an STNG log, a CANbus analyser or oscilloscope are the tools a technical dealer would use to investigate that problem, but a clue is in the fact that it's affecting the AIS only: perhaps the problem is close to the AIS's own STNG cabling. Subtle CANbus problems can easily produce intermittent faults that affect indivdual products' data. Either way, I would be confident it's not a fault with the AIS itself.

Tom