C-Nav 2050, Руководство пользователя

Страница: 27 / 75

2050 User Guide
Chapter 4 Configuration
The 2050 GPS sensors have a rich interface and detailed control language, which allows each unit
to be tailored specifically to the required application.
Factory Default Settings
By factory default, COM 2 is designated as the Control Port. The Control Port manages the
full functionality of the 2050. COM 1 , by factory default, is designated as the Data Port. By
factory default this port handles the non-NCT proprietary messages that are input and/or
output to/from the receiver.
By factory default, NMEA message GGA data is scheduled for output from COM 1 at 1Hz.
The baud rate at which COM 1 and COM 2 communicate is factory defaulted to 19.2k Baud.
This baud rate can be changed to accommodate faster data rates. Refer to Appendix D for
NMEA detailed information.
The standard factory configuration for the 2050 allows for the basic operation of the system.
The Control Port factory default for NCT Proprietary Message Blocks output is described in
Table 7. These message blocks afford the novice or seasoned
GPS user the best
opportunity to get up and surveying in a minimal period of time.
Message Rate Description
44
On
Change
Packed Almanac
81
On
Change
Packed Ephemeris
86
On
Change
Channel Status
B0
On
Change
Raw Measurement Data
B1
On
Change
PVT Block
Table 7: Factory Setup Proprietary Messages COM 2
The output data rate for the factory default message blocks is described in Table 7 and will
remain at that rate until the user specifies otherwise by issuing the appropriate NCT
Proprietary command.
5-19