#1 2019-06-19 09:43:37

Duncan_Hill
Member
From: Dun Laoghaire, Ireland
Registered: 2017-03-14
Posts: 53

Intermittent ST FAIL on an older SeaTalk1 system

This is one that's been puzzling me for a while, and I think I worked it out the other day. I'd get intermittent ST FAIL messages after powering up the navigation systems. The suspected root cause was an ungrounded talker on the network. The backstory of the root cause is that I bought a ShipModul relatively soon after getting Blue Opal, and had only connected the data positive and negative wires to the ST bus. ShipModuls use opto-isolated connectors, so the -ve power rail wasn't connected to the data -ve internally.

Shield wire is now connected properly to the ShipModul input 1 port, and I suspect the ST FAIL messages won't show any more. It was intermittent, so reproducing will be annoying to do.

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