User manual NORTHSTAR 957 GPS INSTALLATION REV C1

[. . . ] 957 GPS/WAAS CHART NAVIGATOR INSTALLATION MANUAL Revision C1 Part Number GM957IM Northstar Technologies 30 Sudbury Road Acton, Massachusetts 01720 800/628-4487 978/897-6600 www. northstarcmc. com Limited warranty policy Northstar Technologies, Inc. warrants the Northstar 957 to be free from defects in materials and workmanship for a period of two (2) years. This warranty applies to the original purchaser and to any subsequent owner during the warranty period, which begins on the date of shipment of the unit, F. O. B. Acton, Massachusetts, to an authorized Northstar dealer. [. . . ] The OUTPUT FORMAT option provides the following choices: · NMEA 0183 Version 2. 1 is a general-use interface output format used by most autopilots, radars, plotters, and other equipment. (NMEA 0183 Version 1. 5 sentences--BWC, GLL, and RNN--allow backwards compatibility with marine equipment designed for this earlier version of 0183). NMEA 0180 is an infrequently used format, developed in the late 1970's, required by certain older autopilots. None turns the outputs off for when the 957 isn't connected to an external device. 0183 Ray is used when transmitting/receiving position information to or from Raytheon equipment. In Raytheon's · · · Page 42 957 INSTALLATION MANUAL, Revision C1 SECTION SIX: Interfacing the 957 system NMEA 0183 format, the checksum isn't used. (Note: Since the checksum isn't used, the 957 may receive incorrect NMEA data when connected to an external Raytheon loran. ) · Datamarine CDX is required by Datamarine's cross-track-error indicators, the latest of which display distance and bearing to the waypoint. Displaying NMEA output sentences When you select 0183 or 0183 RAY as the output format (after pressing the EDIT menu key) and press ENTER, a screen is displayed showing all the NMEA 0183 sentences the 957 can output. Three-letter abbreviations identify each sentence and are listed alphabetically. (For the meaning of these sentences, see the NMEA interface specifications document published by the NMEA. ) The sentences to be output are followed by the word ON; those that won't be output have two dashes indicating that they're off. Some devices can't handle all these sentences correctly, so you can customize the output here by turning individual sentences on or off. In general, you may want to turn on only those sentences used by the particular equipment interfaced to the 957. Turning NMEA output sentences on and off To turn on or off the 957's NMEA 0183 sentences, first follow the above description to display the 0183 SENTENCE screen, then follow these steps: 1. Press the CURSOR PAD to highlight the sentence you want to turn on or off, then press the EDIT menu key. Press the CURSOR PAD to toggle the sentence on or off, and press ENTER to make your selection (or CLEAR to leave it unchanged). 957 INSTALLATION MANUAL, Revision C1 Page 43 SECTION SIX: Interfacing the 957 system 3. Repeat for each sentence as desired. When you're done, press the RETURN menu key to go back to the PORT SETUP screen. NOTE: The NMEA ON/OFF item list controls only the Version 2. 01 GLL and BWC items, not the 1. 5 version of these items. Thus, ON/OFF changes made to the Version 1. 5 GLL and BWC output items have no effect on the data actually output unless you select that particular format version. If you want to set all the sentences to the factory settings for recommended output, press the SAFE RESET menu key. If you want to turn on only a select few sentences for output, press the ALL OFF menu key to turn off all sentences, then turn the desired ones back on. Choosing the talker ID The NMEA 0183 standard requires that the equipment you're interfaced to--the "listener"--knows what type of device is transmitting the data. The 957's talker ID tells the listener that it is receiving information from a navigation source, not a communications or sensor device--which transmits completely different forms of data. Certain listening devices will only accept navigation data identified as coming from loran (LC), GPS (GP), or an integrated instrument (II). The 957 lets you set its talker ID to LC, GP, or II to match what the listener device is expecting: 1. Check the listener device's instruction manual to determine which "talker ID" codes it will respond to. At the PORT 1 SETUP or PORT 2 SETUP screen, press the CURSOR PAD to highlight the NMEA 0183 TALKER ID option, then press the EDIT menu key. Scroll through the three choices using the CURSOR PAD to make your selection, and press the ENTER key. The interfaced equipment will now receive the 0183 data in the correct nav-source format. 3. Choosing the lat/lon precision For more flexibility when communicating with a variety of other devices, you can set the precision level of the 0183 position information output by the 957. [. . . ] Serial communications: RS-232 asynchronous data port, Main port IN/OUT plus AUX input; 19, 200 baud standard (both ports user-selectable from 300 to 19, 200 baud). Default baud rate = 9600. Performance Acceleration: 4 Gs (39. 2 m/s2), Jerk: 2 m/s3 Velocity: 1852 km/h (514 m/s) max. Time-to-first-fix (TTFF): Hot start - 20 seconds typical, with current almanac. Warm start - 45 seconds typical, with current almanac. [. . . ]