2201 Operating Modes - NorthStar 2201 Installation Manual

2201 operating
modes
Self-test mode
Initialization mode
2201 INSTALLATION MANUAL, Revision B
•
operating temperature -30° C to +75° C (standard)
•
9 to 36 VDC (12V and 24V system) 2.4 watts typical at 12V
•
1" x 14 (threads per inch) standard thread mast mounting
•
screws and washers for deck mounting
•
waterproof, fully sealed unit
For the complete listing of the 2201's specifications, see
Appendix A at the back of this manual.
The 2201 has seven automatic operating modes:
•
Self-test
•
Initialization
•
Acquisition
•
Navigation (includes three sub-modes: Differential 3-D,
Differential 2-D, and 3-D Nav)
•
WAAS/beacon differential
•
Dead-reckoning
•
Fault
The 2201 automatically switches between modes, and reports
through its host port the current operating and navigation
modes. The seven operating modes are described in detail
below.
The 2201 enters self-test mode upon a host's request, using an
NMEA or binary message, via the GPS primary port. This test
requires no more than 15 seconds. When the self-test is
completed, the 2201 reports the test results on its host port
through another NMEA or binary message, and then either
proceeds to initialization mode if the test was passed or to fault
mode if a problem was detected.
The 2201 enters initialization mode automatically when power
is applied or after completion of the self-test mode. While in
initialization mode, the 2201 retrieves satellite orbital data
(ephemeris or almanac) stored in its EEPROM memory.
Integrity checking is performed on all data retrieved from the
EEPROM to ensure accuracy. After initialization, the 2201
enters acquisition mode.
SECTION ONE Introduction
Page 7