[TG] [TG11] No pilot - P70, acu100, ev1

[Tom - Raymarine - Moderator]

Hello Riche-mort,

Quote:Ok, I have taken some more measurements as i think i did misunderstand your instructions initially.

EV1:
0v - CANL = 4.6 M
0v - CANH = 4.6 M
CANL - CANH = 27.8 k

ACU100
0v - CANL = 3.9 M
0v - CANH = 3.9 M
CANL - CANH = 50 k

P70R
0v - CANL = .6 M
0v - CANH = .5 M
CANL - CANH = 28k

My colleague in the office has checked a test system against your measurements, and found quite different results:
EV1:
0v - CANL = 37 Mohms reducing
0v - CANH = 37 Mohms reducing
CANL - CANH = 27.8 kohms

ACU100
0v - CANL = Open circuit
0v - CANH = Open circuit
CANL - CANH = 54.7 kohms

P70R
0v - CANL = 35 Mohms reducing
0v - CANH = 35 Mohms reducing
CANL - CANH = 28.3 kohms

It doesn't look good for your system: I'd say you've most likely had some high-voltage transient (perhaps an electrostatic discharge from a nearby, not direct, lightning strike) which has damaged the CAN chips in all 3 devices. I'd like to see this verified one device at a time in a test system, but if this is the case then I'd say it should be an insurance claim.

Regards,
Tom