Connection To Adjacent St30 Instruments - Raymarine Autohelm ST 30 Manual

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1.5 Connection to adjacent ST30 instruments

The ST30 Depth is supplied with a daisy-chain cable that allows adjacent
ST30 instruments to be linked together. The daisy-chain cable supplies
power to adjacent instruments and allows data to be transmitted and
received via the SeaTalk bus.
The daisy-chain cable plugs into one of the SeaTalk ports on the back
cover. Incorrect orientation is not possible as the ports and plugs are
matched.
ST30 Depth Operation and Installation Handbook