Connecting Si-Tex Sp-70 Autopilot to E97

[Chuck - Raymarine - Moderator]

efontana,

NMEA 0183 communications requires two leads, a signal lead (NMEA OUT+) and a reference lead (NMEA OUT-). The NMEA 0183 output of Raymarine products may be paralleled to supply data to up to three NMEA 0183 listeners. Should the product's NMEA 0183 output need to be supplied to more than three NMEA 0183 listeners, then a NMEA 0183 Expander would need to be installed. Such paralleling is typically accomplished by connecting the MFD's NMEA 0183 OUT+ and OUT- leads to a terminal strip. The corresponding NMEA 0183 IN+ and IN- leads of the NMEA 0183 listeners would then also be connected to the terminal strip. When properly installed, a closed circuit would be formed between the MFD's NMEA 0183 OUT+ lead of the MFD and the NMEA 0183 IN+ leads of the NMEA 0183 listeners. Additionally, and when properly installed, a closed circuit would be formed between the MFD's NMEA 0183 OUT- lead of the MFD and the NMEA 0183 IN- leads of the NMEA 0183 listeners. Each NMEA 0183 listener and the MFD must be configured to support the same communications BAUD rate (i.e. 4800 or 38400).