Seatalk Failure

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum Tim,

Please click here to view a FAQ addressing this subject. Should no equipment additions, substitutions, or modifications to the SeaTalk bus have taken place, then the problem is most likely resulting from failure of the SeaTalk communications circuitry of one of the system's devices. My recommendation would be to reduce the system to the RL70C or RL80C and one of the instruments or the GPS sensor and then verify communications between them. The databoxes or the RL80C or RL70C would be used to verify SeaTalk communications. Be aware that instruments such as wind, depth, and speed do not require communications to report data that they themselves determine. As you have suggested, identification of the device(s) having faulty SeaTalk communications circuity is simply a matter of one by one adding devices to a small working system and then verifying that communications persists.

Please be aware that none of the items listed can be services by Raymarine's Product Repair Center any longer. However i50 / i60 instruments may be used to replace ST60/ST60+ instruments having failed SeaTalk communications circuitry.

SeaTalk instruments, autopilot components, GPS sensors, and chartplotters featuring a 1st generation SeaTalk interface which do not additionally feature a SeaTalkng interface (ex. ST40/60 Instrument Displays, ST6001, S2G, Wireless AP Controller, Raystar 125 GPS Sensor, etc.) should be interfaced to one another, in any order, connected via a daisy chain or to SeaTalk Junction Blocks, using standard SeaTalk Cables having press-fit 3-pin plugs. SeaTalk Cables can be joined using D244 SeaTalk Junction Blocks, splices, marine grade terminal strips, or R55006 SeaTalk Auxiliary Junction Boxes. SeaTalk Cable is available in 15", 1m, 3m, 5m, and 9m lengths. This method of interfacing is referred to as a SeaTalk bus. The SeaTalk bus may be powered via SeaTalk Auxiliary Junction Box (best practice) or via the SeaTalk port of an autopilot course computer. Larger SeaTalk busses may feature more than one power insertions to offset line losses. A sample system diagram may be seen below: