iReference+® Smart GNSSource-1000 Manual PRELIMINARY , October 2019 Smart, low-Cost & high-Performance GNSS_OCXO Reference Source GNSSource-1000 Smart PPS/ GPS Clock Reference Source SmarTiming+®1ns-Resolution Disciplining Technology Inside APPLICATIONS Synchronization | Timing | Reference/Test Source | Time/Frequency Source [email protected] www.spectratime.com +41.32.732.16.66 Specifications are subject to change without prior notice An Orolia Group Business iReference+® GNSSource-1000 Manual Table of Content : 1. INTRODUCTION ........................................................................................................................................................... 4 2. BEFORE GETTING STARTED .......................................................................................................................................... 4 2.1 UNPACKING ................................................................................................................................................... 4 2.2 SAFETY! ........................................................................................................................................................ 5 2.3 ENVIRONMENTAL RESPONSIBILITY.................................................................................................................. 5 2.4 INSTALLATION PROCEDURE............................................................................................................................ 5 2.4.1 Connections ......................................................................................................................................................... 5 2.4.2 Software Monitoring ........................................................................................................................................... 6 3. SYSTEM OPERATIONS .................................................................................................................................................. 8 3.1 OPERATING MODES ....................................................................................................................................... 8 3.2 OPERATING MODE SETUP .............................................................................................................................. 8 3.3 NORMAL POWER / ON SEQUENCE ................................................................................................................... 8 4. SYSTEM DESCRIPTION ................................................................................................................................................. 9 4.1 BLOCK DIAGRAM ........................................................................................................................................... 9 4.2 THE TIMING AND TRACKING SYSTEM OF THE GXCLOCK ................................................................. 10 4.2.1 THE “TRACK” MODE AND THE “SYNC” MODE. .................................................................................................. 11 4.2.2 THE FREQUENCY LEARNING .............................................................................................................................. 11 4.2.3 THE FREQUENCY IN USE .................................................................................................................................... 11 4.2.4 USER FREQUENCY CORRECTION ........................................................................................................................ 12 4.2.5 THE PPS TRACKING LOOP .................................................................................................................................. 12 4.2.6 TRACKING LIMITS AND ALARMS ........................................................................................................................ 12 4.2.7 FREQUENCY FLUCTUATIONS DURING THE TRACKING ....................................................................................... 12 4.2.8 FINE PHASE COMPARATOR OFFSET ................................................................................................................... 13 4.2.9 THE AUTOMATICAL RESTART OF THE TRACKING .............................................................................................. 13 1.1 SIMPLE SERIAL INTERFACE OPERATION ........................................................................................... 14 1.1.1 INTRODUCTION ................................................................................................................................................. 14 1.1.2 SERIAL INTERFACE CONNECTION ...................................................................................................................... 14 1.1.3 GXClock INTERNAL PARAMETERS MONITORING ............................................................................................... 14 1.1.4 CENTRE FREQUENCY ADJUSTMENT WITH THE SERIAL INTERFACE ................................................................... 15 1.1.5 CENTER FREQUENCY READ-BACK ...................................................................................................................... 15 1.2 STATUS & ALARMS ...................................................................................................................................... 15 2 TIMING & LOCKING CONTROL FUNCTIONS EXTENDED LIST ....................................................................................... 16 2.1 INFORMATION COMMANDS ................................................................................................................... 16 2.2 TRACKING COMMANDS ......................................................................................................................... 16 2.3 PPSOUT COMMANDS ............................................................................................................................. 16 2.4 DATE / TIME COMMANDS ....................................................................................................................... 16 2.5 SETTING COMMANDS............................................................................................................................. 16 2.6 OTHER COMMANDS ................................................................................................................................ 16 2.7 DEVICE STATUS ...................................................................................................................................... 44 2.7.1 STATUS BROADCASTED BY MESSAGES .............................................................................................................. 44 2.8 THE MAVXX.. SYSTEM .............................................................................................................................. 45 2.8.1 INTRODUCTION ................................................................................................................................................. 45 2.9 MAVXX.. PARAMETERS DESCRIPTION FOR THE GXCLOCK ................................................................ 46 2.9.1 Clock main parameters ...................................................................................................................................... 46 2.9.2 GPS main parameters ........................................................................................................................................ 46 2.10 SERIAL COMMUNICATION INTERFACE 2 ......................................................................................... 73 2.11 THE NMEA MESSAGES ............................................................................................................................ 74 2.11.1 Conditions : ........................................................................................................................................................ 74 2.11.2 Messages activation: ......................................................................................................................................... 74 2.11.3 Messages cancellation: ..................................................................................................................................... 74 2.11.4 The NMEA messages list: ................................................................................................................................... 74 2.11.5 Message NMEA $PTNTA .................................................................................................................................... 75 2.11.6 Message NMEA $PTNTS,B ................................................................................................................................. 75 2.11.7 Message NMEA $GPRMC .................................................................................................................................. 77 2.11.8 Message NMEA $GPZDA ................................................................................................................................... 78 [email protected] www.spectratime.com +41.32.732.16.66 Page 2 of 91 An Orolia Group Business iReference+® GNSSource-1000 Manual 2.12 THE NMEA $GPRMC MODE ................................................................................................................... 79 2.13 SPECIAL COMMANDS ................................................................................................................................ 80 2.14 TIME OF DAY COMMAND SYNCHRONIZATION ............................................................................................