[CA] [CA11] c95 to existing ST1 daisy chain

[Chuck - Raymarine - Moderator]

HS,

For product designs which succeeded those which are presently installed onboard your boat, a SeaTalk to SeaTalkng Converter Kit would have been utilized to bridge data between the SeaTalk bus used by the currently installed equipment and the SeaTalkng/NMEA 2000 network supported by the c95 MFD. However, neither ST80 products nor Type 100/300 autopilot course computers are supported for use with a ST-STng Converter Kit. In this case, it would be recommended that the MFD (NMEA 0183 Port 1) be interfaced to the autopilot course computer via bidirectional NMEA 0183 communications. The Type 100/300 autopilot course computer is designed to bridge instrument data (wind, speed, depth) from SeaTalk to NMEA 0183 ... see the Type 100/300 Autopilot Course Computer NMEA 0183 Interface section of Chapter 2.12 Interfacing to other manufacturer's equipment (NMEA) of the Autohelm Type 100/300 Autopilot Installation and Setup. However, care should be undertaken, as the Type 100/300 Autopilot Course Computer may loop data which it receives via its NMEA 0183 communications port. Should this occur, then it would be necessary to install a programmable NMEA 0183 multiplexer (ex. Actisense NDC-4-USB) between the autopilot's NMEA 0183 output port and the MFD's NMEA 0183 input port to block all NMEA 0183 sentences except for those containing heading, wind, speed through water, water temperature, and depth data. The most common symptom of data looping occurs in conjunction with navigational data. When the MFD executes a Go-To or Follow Route command, NMEA 0183 sentences containing the associated navigational data are transmitted to the autopilot and may then be transmitted by the autopilot course computer back to the MFD. This condition will prevent the MFD from cancelling navigation (Stop Go To or Stop Follow). This condition may be avoided completely by interfacing the MFD to the autopilot in a manner which would support one way communications ... MFD to autopilot.

The MFD's second NMEA 0183 input port (Port 2) may be configured for 38400 BAUD NMEA 0183 communications to support data reception from an AIS receiver/transceiver. Alternatively, should the AIS receiver/transceiver support SeaTalkng/NMEA 2000 communications protocol, then the MFD and AIS receiver/transceiver may each be interfaced as spurs to a powered and properly terminated SeaTalkng / NMEA 2000 backbone.