Interconnecting old and new instruments--a few questions

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum Bill,

Please click here to view a FAQ addressing this subject.

Q1) My NMEA 2000 backbone has 12V power injected at the midpoint. When connecting the ST1 to STng converter, and then connecting the STng to NMEA cable to the NMEA backbone via T connector, do I need to also install the STng power cable, or is that redundant to the NMEA power?
A1. No. The Type 100 Autopilot Course Computer, ST60 Instruments, and ST6000+ Autopilot Control Head should each be interfaced via a SeaTalk bus with the Type 100 autopilot being the last device in the SeaTalk daisy chain. As the SeaTalk bus will be powered by the NMEA 2000 backbone via the SeaTalk to SeaTalkng Converter, care must be taken to ensure that the red lead of the SeaTalk cable connecting the Type 100 Autopilot Course Computer's SeaTalk port to the SeaTalk bus has not been connected to the autopilot course computer's red SeaTalk terminal (i.e. it will not be used).

Q2) Do I need to modify the ST1 device power wire as well? I have read here that one may need to clip the power lead in the ST1 cables in these situations.
A2) Per the response to Q1, the SeaTalk bus will be powered by the NMEA 2000 backbone via the SeaTalk to SeaTalkng Converter. Care must be taken to ensure that no power is provided to the SeaTalk bus prior to connecting it to the SeaTalk to SeaTalkng Converter.

Q3) Finally, if I need to use NMEA 0183 to connect autopilot to chart plotter, can I use the NMEA 0183 terminals on the back of the ST6000+ or would I need to run a wire to the course computer down below?
A3) While possible to do so, this option is not recommended, as it will permit data to flow in one direction only ... from the third party chartplotting product to the Raymarine system.