User's Manual
Table Of Contents
- USER GUIDE
- Legal Notices
- Safety Information
- Contents
- Introduction
- Features and Functions
- Batteries and Power
- Setup Guidelines
- Setting up the Receiver
- Configuring the Receiver Settings
- Using the SCS900 Site Controller software to configure the base station, the rover, and the radios
- Configuring the receiver to log data for postprocessing
- Configuring the receiver in real time
- Configuring the receiver using application files
- Creating and editing the configuration files that control the receiver
- AutoBase Feature
- Default Settings
- Specifications
- NMEA-0183 Output
- GSOF Messages
- Adding Internal Radio Frequencies
- Upgrading the Receiver Firmware
- Data Logging and Postprocessed Measurement Operations
- Troubleshooting
- Glossary
SPSx80 Smart GPS Antenna User Guide 75
NMEA-0183 Output A
Common message elements
Each message contains:
• a message ID consisting of $GP followed by the message type. For example, the
message ID of the GGA message is $GPGGA.
• a comma
• a number of fields, depending on the message type, separated by commas
• an asterisk
• a checksum value
Below is an example of a simple message with a message ID ($GPGGA), followed by 13
fields and a checksum value:
$GPGGA,172814.0,3723.46587704,N,12202.26957864,W,2,6,1.2,18.893,M,-
25.669,M,2.0,0031*4F
Message values
NMEA messages that the receiver generates contains the following values.
Latitude and longitude
Latitude is represented as ddmm.mmmm and longitude is represented as
dddmm.mmmm, where:
• dd or ddd is degrees
• mm.mmmm is minutes and decimal fractions of minutes
Direction
Direction (north, south, east, or west) is represented by a single character: N, S, E, or W.
Time
Time values are presented in Universal Time Coordinated (UTC) and are represented
as hhmmss.cc, where:
• hh is hours, from 00 through 23
• mm is minutes
• ss is seconds
• cc is hundredths of seconds
NMEA messages
When NMEA-0183 output is enabled, the following messages can be generated.