Jackson Labs FireFly-1A GPSDO, User Manual, Page: 17 / 44

© 2011 Jackson Labs Technologies, Inc. 11
FireFly-1A User Manual
3.4.3 PTIMe:TIME?
This query returns the current 24-hour time. The local time is referenced to UTC time. The hour,
minute, and second is returned.
3.4.4 PTIMe:TIME:STRing?
This query returns the current 24-hour time suitable for display (for example, 13:24:56).
3.4.5 PTIMe:TINTerval?
This query is equivalent to the command SYNChronization:TINTerval
3.4.6 PTIME?
This query returns at once the result of the four following queries:
PTIME:DATE?
PTIME:TIME?
PTIME:TZONE?
PTIME:TINTerval?
3.5 SYNChronization Subsystem
This subsystem regroups the commands related to the synchronization of the FireFly-1A with the
GPS receiver. The list of the commands supported for this subsystem is the following:
SYNChronization:SOURce:MODE [GPS|EXTernal|AUTO]
SYNChronization:SOURce:STATE?
SYNChronization:HOLDover:DURation?
SYNChronization:HOLDover:INITiate
SYNChronization:HOLDover:RECovery:INITiate
SYNChronization:TINTerval?
SYNChronization:IMMEdiate
SYNChronization:FEEstimate?
SYNChronization:LOCKed?
SYNChronization?
3.5.1 SYNChronization:SOURce:MODE [GPS|EXTernal|AUTO]
The board may be configured lock to an external 1PPS source, or the internal GPS receiver. A small
through-hole pad next to the SMA connectors labeled “1PPS IN” may be used to feed an external
CMOS rising-edge 1PPS signal with 0V < x <5V signal level, and 1us minimum pulse width into the
unit. Use one of the various ground pins on the board as a 1PPS signal return.