MTG GP- 5456028 - Caterpillar

Coordinated Universal Time (UTC)
Coordinated Universal Time (UTC) is the time standard that is used by the onboard system and related software. UTC is the time on the zero or the time on the Greenwich meridian. This time standard does not reflect changes due to Daylight Savings Time. All times are communicated between the Onboard System and Office software as seconds since 01January 1970 with the seconds synchronized to UTC. This format allows the date to be communicated also with the time.Local Time Versus System Time
The time that is displayed in the digital window of the monitor display group is the local time. The calculation for local time is based on system time and the information on the time zone. These values are configured with the use of configuration keys. When the onboard is started, the information of the time zone for the system time is based on the "$ Time Zone Minutes" configuration key. The system time is set when the onboard receives the first GNSS position. To set system time, the system applies the GNSS offset to the value of the GNSS time that was received. The default value is 13, but the value can be configured with the use of the "$ GPS UTC Offset" key.Configuration Keys
Table 1
List of Configuration Keys    
Configuration Key     Description    
"$ Daylight Time Date"     This key specifies information regarding the change from standard time to daylight savings time.    
"$ GPS UTC Offset"     This key specifies the number of seconds that time leads UTC.    
"$ Standard Time Date"     This key specifies information regarding the change from daylight savings time to standard time.    
"$ Time Zone Minutes"     This key specifies the number of minutes that are offset from Greenwich Mean Time (GMT).    Refer to Table 1 for information about the configuration keys that are applicable for time information. For further information, refer to Systems Operation, UENR3246, "Configuration Keys".Time Synchronization Keys
Table 2
List of Time Synchronization Keys    
Configuration Key     Description    
$ GPS Time Set Interval     This configuration key allows controlling the interval at which Tope checks if the clock as drifted. If the clock drifted by more than a certain threshold, tope will resynchronize the clock and send a Time Adjust TMAC message to notify the office. The minimum configurable value for this key is 60 secs.    
$ xIM Sync Period     This key allows controlling the threshold value required specifying the required clock drift for performing a synchronization with the xIM.    Refer to Table 2 for information about the configuration keys that are applicable for time synchronization information. For further information, refer to Systems Operation, UENR3246, "Configuration Keys" .