4 OEM4 Family Installation and Operation User Manual Rev 12Table of Contents3.2.4 Applying Power to the Receiver..................................................................353.2.5 Connecting Data Communications Equipment ...........................................353.3 Additional Features and Information ....................................................................363.3.1 Strobes........................................................................................................363.3.2 USB (OEM4-G2 and OEM4-G2L Only) ......................................................383.3.3 Status Indicators .........................................................................................383.3.4 External Oscillator (OEM4-G2 / -G2L Only)................................................393.3.5 External Antenna LNA Power (OEM4-G2 Only) .........................................403.3.6 Mounting Bracket (ProPak-G2 and ProPak-LB Only) .................................404 Operation 424.1 Communications with the Receiver ......................................................................424.1.1 Serial Port Default Settings.........................................................................424.1.2 Communicating Using a Remote Terminal .................................................434.1.3 Communicating Using a Personal Computer..............................................434.2 Getting Started .....................................................................................................434.2.1 Starting the Receiver ..................................................................................444.2.2 Remote Terminal, PC and GPS Receiver...................................................444.3 Transmitting and Receiving Corrections...............................................................464.4 Enabling SBAS Positioning ..................................................................................484.5 Enabling OmniSTAR Positioning (ProPak-LB Only).............................................484.6 Pass-Through Logging .........................................................................................494.7 T Sync Mod ..........................................................................................................514.8 Transferring Time Between Receivers .................................................................524.8.1 Procedures..................................................................................................525 Message Formats 545.1 RTCA-Format Messages......................................................................................545.1.1 RTCA1 ........................................................................................................545.1.2 RTCAEPHEM Type 7...............................................................................555.1.3 RTCAOBS Type 7 ....................................................................................555.1.4 RTCAREF Type 7 ....................................................................................565.2 RTCM-Format Messages .....................................................................................565.2.1 RTCM1........................................................................................................575.2.2 RTCM3 Base Station Parameters (RTK) ....................................................585.2.3 RTCM9 Partial Satellite Set Differential Corrections...................................585.2.4 RTCM15 Ionospheric Corrections...............................................................595.2.5 RTCM16 Special Message .........................................................................605.2.6 RTCM18 and RTCM19 Raw Measurements (RTK)....................................605.2.7 RTCM20 and RTCM21 Measurement Corrections (RTK) ..........................615.2.8 RTCM22 RTCM Extended Base Station Parameters (RTK) ......................615.2.9 RTCM59 Type 59N-0 NovAtel Proprietary Message (RTK) .......................615.3 CMR Format Messaging ......................................................................................625.3.1 Using RT-2 or RT-20 with CMR Format Messages ....................................625.4 NMEA Format Data Logs .....................................................................................646 Positioning Modes of Operation 656.1 Single-Point or Autonomous.................................................................................65