Simrad ROBERTSON AP45 manual Connection to Navigation Receiver

Page 5-36	Robertson AP45 Autopilot
	Installation

Connection to Navigation Receiver

The AP45 is preset to accept signals of NMEA 0183 format. For 180/182 format, please contact your Simrad Robertson dealer.

Correct NMEA format, baud rate and current loop polarity are found in the navigation receiver manual.

For older AP45’s with s.n. below 4000 (Main PCBs with revision up to and including revision G), the N40 Navigation Interface must be mounted in the control unit. The N40 is plugged into the holes provided on the Main PCB (Fig. 5-43).

Fig. 5-43

N40 Nav. Interface mounting

(For Main PCBs with revision up to and including revision G)

The AP45 is set to correct polarity and Baud rate by putting the BCD-switch on the N40 PC-board (Fig. 5-43)in the appropriate position.

Sentences used are: APA, APB, XTE, XTR, RMB, BWW, BWC, BWR, BOD, HSC.

The AP45 automatically selects the sentence(s) to use according to the “NMEA Priority table” on page 7-8.

Position 3: NMEA 0180, standard polarity

Position 8: NMEA 0183, inverse polarity

Position 9: NMEA 0183, standard polarity

Note!

Both a hardware setting (switch or strap), and a software selection from the info- loop is necessary to select the Nav. Interface format (0180, 0183).

The NMEA format is selected under the installation loop, see page 6-5.The NMEA 0183 format accepts different sentences as per “NMEA Priority table”, page 7-8.

For receivers with NMEA 0183 format that outputs both XTE and Bearing to waypoint type of nav. information, the autopilot displays the XTE information between the waypoints, and Bearing information at the waypoint.

Simrad Robertson AS

Egersund - Norway