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USERS GUIDE

NR2310D-ROG

REVISION

N

DATE

031121

Page #:

25

www.novuspower.com

PPS Cabling

Connecting a PPS to a system is a subtle challenge. It is a pulse and as such,

connecting a pulse to a distant point is not simple. Firstly, the very name PPS
implies that you are dealing with a 1 Hz signal. Nothing could be further from
the truth. Most PPS pulse signals have a rise and fall time that is on the order
of 5 ns

– this is more like a 200MHz signal than a 1 Hz signal. In addition, while

many loads look like a CMOS high impedance load, attempts to connect with
50 Ohm cable frequently end up with ringing that may cause an edge to
become ill-defined.

PPS Ringing

PPS

Amplitude for 1PPS

3.3 Vdc CMOS (5 Vdc option)

Pulse width for 1PPS

Programmable 1 to 500ms in 1 usec steps

Rise time for 1PPS

<5 ns

Accuracy @1

σ

analog

15ns

HS1

15ns

HS2

15ns

HS3

5ns

HS4

5ns

Pulse to Pulse Jitter @ 1

σ

analog

5ns

HS1

5ns

HS2

GNSS-PPS <5ns SYTH-PPS< 200psec

HS3

GNSS-PPS <5ns SYTH-PPS< 200psec

HS4

GNSS-PPS <5ns SYTH-PPS< 200psec

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Содержание NR2310D-ROG

Страница 1: ... Rubidium Frequency Reference with RS232 Display and optional Ethernet SNMP All information provided herein is the proprietary property of Novus Power Products LLC The information included may be reproduced without the permission or prior approval of Novus Power Products LLC for the purpose of operating the equipment ...

Страница 2: ...o a 1000 Ohm load Rise time must be less than 10ns and the pulse width must be greater than 10 ms 20 GNSS Antenna recommended HS1 HS2 21 GNSS Antenna recommended HS3 HS4 22 PPS 23 PPS source 24 PPS Cabling 25 Cable Delays 28 Pulse Width 28 PPS Holdover 29 NMEA RS232 30 Base Unit Block Diagram 33 Phase Noise Performance 34 Controls and indicators 35 Channel Status Front panel LED s 35 Oven LED fron...

Страница 3: ... 10 output connectors BNC or SMA 39 PPS SMA with GPS locking option 39 Alert BNC SMA 39 Power In 39 Functional Description Base NR2310D ROG 40 Outputs 40 Built in Test 40 Power Supplies 41 Redundant power 41 Specifications 42 Technical Specifications 42 Environmental and Mechanical 45 LIMITED HARDWARE WARRANTY 45 ...

Страница 4: ...e the user to dangerous voltages The unit may be powered from more than one power source Care must be taken to be certain all power sources are removed before installation or during removal of the equipment The unit must be operated with a secure earth ground to the chassis The electrical path for earth ground is through the power connector The power switching device that controls power to the equ...

Страница 5: ...certain that the total heat load in the cabinet does result in an interior operating temperature that exceeds the equipment maximum rated temperature If cooling must be used care should be given to prevent cooling mechanical vibration from the coupling into the equipment Mechanical shock and vibration may introduce noise into the electronic signals inside the equipment that may degrade the perform...

Страница 6: ...ation from the GNSS The Rubidium source is followed by a low noise OCXO locked to the Rubidium The ten channels provide a 13 dBm sine output that is transient and fault protected The unit also provides a single channel PPS output and a RS232 port The RS232 port provides NMEA 0183 data as well as proprietary data streams for instrument status and control The unit features a front panel display for ...

Страница 7: ...n Novus offers a range of locked reference performance options Timing information from the GNSS is very much a function of the receiver used the processing of the received timing information and how the timing source be it an OCXO a Rubidium or some other device is controlled Environmental factors such as temperature shock and vibration all impact the overall system Over the years Novus has invest...

Страница 8: ...eference followed by a clean up OCXO Our Rubidium references offer a stability of 1 ppb year compared to a typical OCXO 50 ppb year The Rubidium source consists of a voltagecontrolled crystal oscillator VCXO which is locked to a highly stable atomic transition in the ground state of the 85Rb isotope Novus uses several vendors for the OCXO The OCXO selected is based on required phase noise stabilit...

Страница 9: ...SS receivers available with a range of functionality Novus uses a few that are selected to meet the needs of our reference and PPS pulse per second sources PPS stability and accuracy varies with each radio and cost rises with performance A significant part of the problem is the PPS being generated by the radio No two radio designs are the same and the algorithms that generate the PPS vary widely F...

Страница 10: ...31121 Page 10 www novuspower com Depending upon the locking algorithm the radio PPS variation can contribute directly to phase noise and uncertainty Novus uses two types GNSS receivers depending upon the stability options installed in the unit ...

Страница 11: ...els GPS L1C A 1575 42 Mhz x x L2C 1227 60 MHz x GLONASS L1OF 1602MHz x x L20F 1246 MHz x Galileo E1 B C 1575 42 x x E5 b 1207 140MHz x BeiDou B1l 1561 098MHz x B2l 1207 140Mhz x Sensitvity GPS Tracking 161 167 Hot Start 161 157 Cold Start 147 148 Reacqusition 161 160 Glonass Tracking 157 167 Hot Start 157 157 Cold Start 143 148 Reacqusition 157 160 ...

Страница 12: ... OCXO is controlled using a loop as indicated below The standard loop does an outstanding job of controlling an OCXO Components such as GaAs mixers provide excellent phase measurement performance but close in phase noise is difficult due to the size of the filtering components required and attendant leakage currents which are limited by the mixer drive currents Typical Allan Deviation performance ...

Страница 13: ...e for many applications the devices within the loop present barriers that are difficult to overcome Achieving very long time constants requires larger and larger capacitors which present leakage current issues A digital platform allows time constants that are unconstrained by a device and more flexibility to handle control loop performance ...

Страница 14: ...USERS GUIDE NR2310D ROG REVISION N DATE 031121 Page 14 www novuspower com The HS1 improves Allan Deviation by an order of magnitude and close in phase noise by 10 dB ...

Страница 15: ...USERS GUIDE NR2310D ROG REVISION N DATE 031121 Page 15 www novuspower com ...

Страница 16: ... time constants digitally High performance picosecond measurement techniques provide greater timing resolution Advanced algorithms coupled with precise analog designs that are thermally controlled and vibration isolated allow Allan Deviation performance approaching E 14 Performance over a standard loop is improved by almost two orders of magnitude ...

Страница 17: ...conds The most advanced loop reports calculated Allan Deviation on real time basis locally on a display and or a selected comm port Allan Deviation can also be set up as an alert so that if there is a defined variation from the base line Allan Deviation an error will be reported This level of monitoring will quickly detect a reference variation far in advance of a complete failure avoiding system ...

Страница 18: ...her enhance performance Novus offers thermal and vibration isolation The thermally isolated unit adds a thermal plate held at a fixed temperature and an additional case around the reference to provide insulation The vibration option adds vibration isolators to attenuate shock and vibration coming from the environment Below is an attenuation curve for the option ...

Страница 19: ...that could cause the source to be in error To be able to detect a problem the dual time base literally adds a second GNSS receiver and an embedded frequency counter to measure the accuracy of the primary reference In some applications a second antenna is installed or a splitter can be used to drive both time base references from a single antenna The average frequency of each gate can be monitored ...

Страница 20: ... Page 20 www novuspower com External PPS Locking The unit may be configured to lock to an external PPS signal The signal must conform to 3 3 V CMOS into a 1000 Ohm load Rise time must be less than 10ns and the pulse width must be greater than 10 ms ...

Страница 21: ...a that will be given as the position fix The GNSS receiver provides power for the LNA in the antenna The unit was designed to provide 3 5 Vdc 25 mA of current Novus NA103A Novus NA106 Typical Antenna Specs Frequency Band 1574 1607 MHz Antenna Gain 2 dBic 90 Amplifier Gain 3 0Vdc 26dB typ Polarization RHCP Out of band Rejection 60dBc f0 50MHz Impedance 50Ω VSWR 2 0 Max DC Input 2 8V 6V Noise Figure...

Страница 22: ...USERS GUIDE NR2310D ROG REVISION N DATE 031121 Page 22 www novuspower com GNSS Antenna recommended HS3 HS4 ...

Страница 23: ... The PPS can be radio sourced or a synthesized PPS User programmable The PPS maybe 5 or 3 3 Volt CMOS Amplitude 2 4 Volts into a 50 Ohm load Default is 3 3 V CMOS Selected at the time of ordering factory configurable only PPS pulse width is programmable Radio PPS 1 ms steps to 500 ms Synthesized programmable to 500ms in 20 ns steps User programmable default is 200ms Cable delays compensates for th...

Страница 24: ...he stability option purchased the PPS has different performance levels The accuracy of the PPS changes and the pulse to pulse jitter varies Also the PPS may be selected to be sourced from a synthesizer or the receiver The rising edge of the PPS is the start of the second for the NMEA data just received ...

Страница 25: ...der of 5 ns this is more like a 200MHz signal than a 1 Hz signal In addition while many loads look like a CMOS high impedance load attempts to connect with 50 Ohm cable frequently end up with ringing that may cause an edge to become ill defined PPS Ringing PPS Amplitude for 1PPS 3 3 Vdc CMOS 5 Vdc option Pulse width for 1PPS Programmable 1 to 500ms in 1 usec steps Rise time for 1PPS 5 ns Accuracy ...

Страница 26: ... a 50 Ohm load If the load is 5 Vdc CMOS at 50 Ohms then the drive current is approaching 100 mA This high drive current also compounds the short circuit protection that is essential in any complex system Short run high impedance cabling can work if done so carefully Other options include LVDS LVDS works very well 20 meters and is offered on several references ...

Страница 27: ... there is more than one client a PPS distribution amplifier should be considered A distribution amplifier will add latency 25 ns and skewing Skewing in the 100 psec range is possible but must be carefully specified Novus PPS Distribution Amplifier Latency Novus PPS Distribution Amplifier Skewing ...

Страница 28: ... NMEA data is shown below The serial data timing is for the next rising edge of the PPS pulse Cable Delays The unit can be programmed to compensate for PPS errors due to cable length A compensation factor of 100000 ns can be used See Appendix C for status strings Pulse Width The pulse width can be programmed from 1 to 500ms ...

Страница 29: ...rned with the stability of the PPS when GNSS lock is lost The circuitry discussed to improve jitter also improves holdover If the oscillator is an OCXO then a PPS drift of 5 to 10 ppb day is achievable 1ms A Rubidium source can be used to achieve drift rate well over an order of magnitude better than the OCXO ...

Страница 30: ...for the NMEA port is selectable Communication speed can be changed into 4800 9600 19200 38400 57600 or 115200 bps In case of using low baud rate please adjust size of output sentence by NMEAOUT command and CROUT command to output all sentence within one second What information is sent from the radio and how often can be selected The NMEA sentence format ...

Страница 31: ...USERS GUIDE NR2310D ROG REVISION N DATE 031121 Page 31 www novuspower com ...

Страница 32: ... output every second The sentences can be independently enabled and disabled using the PERDCFG NMEAOUT and or PERDAPI CROUT command described later in this document as well as using differing transmission rates The NMEA sentence descriptions throughout the document are for reference only The sentence formats are defined exclusively by the copyrighted document from NMEA There is considerable detail...

Страница 33: ... supplies signal present are monitored and are used to drive a status relay as well as indicators on the front panel and optional serial and Internet communications paths To further improve long term stability the unit is disciplined to the GPS GNSS by either having an internal GNSS receiver or supplying the unit a PPS pulse from an external receiver option ...

Страница 34: ...y lower system noise performance while reducing the system cost and rack space requirement Phase Noise Performance Typical phase noise performance is indicated below The phase noise performance is dominated by the OCXO and the noise contribution of the ten channel distribution amplifier The amplifier was designed to minimize phase noise contribution through the use of low noise power sources and h...

Страница 35: ...ed by a BNC connector on the rear panel The normal operating state is the relay will be closed Oven LED front Panel Green indicates that the Oven is operational and that GPS lock has been acquired for NR2310 with GPS Locked option A red color indicates that the oven associated with the OCVCXO has failed Since the NR2310 ROG is a GPS locked reference during power on the OVEN LED will flash during t...

Страница 36: ...ted on this screen GNSS GPS Status The GNSS Status Menu gives the user a quick reference for the quality of the GNSS satellite signal and length of time that each receiver has been locked To toggle between each receiver press the SELECT button The screen will display which receiver status is being viewed there are two GNSS receivers when the unit has the Dual Time base option The user can then see...

Страница 37: ...hannel Status Each channel has an AC to DC converter that monitors the 10 MHz sine square or PPS pulse If a severe fault on the output is detected the faulted channel status will be displayed and the status of all 10 channels is available via the RS232 port Next and Select Buttons The NR2310 Display Menus can be navigated using the NEXT and SELECT buttons In general the NEXT button will advance th...

Страница 38: ...lay connections The relay opens in any of the following alert conditions GNSS Lock is lost OCXO Lock is lost OCXO oven failure or power failure This Alert Option is not available with the Rubidium DB9 Male Connections Pin 2 Tx Pin 3 Rx Pin 5 GND Pin 8 Alert Pin 9 Alert Rear Panel Outputs ...

Страница 39: ... status relay Contacts rated at 20 VDC VAC 0 5 amps Contacts are closed during normal operation Alert status will cause relay to open The BNC option eliminates one output port if selected Power In Primary power input The unit operates from 50 or 60 Hz 88 to 250 VAC The unit does automatic sensing of the input voltage and there are no actions that need to be taken to operate across the defined AC v...

Страница 40: ...ut The fault status is indicated on the front panel via an LED or reported in the digital display The fault status and the protection on each output facilitates installation A channel fault will not activate an ALERT state and the status relay will not be opened The standard outputs are1 0 Vrms 10 MHz sine into 50 Ohm Built in Test The built in test monitors the following Power Supplies All power ...

Страница 41: ...occurs in designs that require an input power switch mode be used There is an EMI filter between the internal power supply and the available power being used This filter minimizes the electrical noise from entering the circuitry and negatively impacting noise performance Also in most applications the equipment that surrounds this unit is sensitive and the filter also reduces noise that could impac...

Страница 42: ...1 HS2 1 second 0 9E 10 10 second 0 9E 10 100 second 2 0E 11 1000 second 0 8E 12 Accuracy Allan Deviation HS3 HS4 1 second 4E 12 10 second 6E 12 100 second 3E 12 1000 second 2E 12 10000 second 3E 13 PPS Amplitude for 1PPS 3 3 Vdc CMOS 5 Vdc option 2 5 Vdc 50 Ohms Pulse width for 1PPS Programmable 1 to 500ms in 1 usec steps Holdover Rubidium 20 usec day Rise time for 1PPS 5 ns Accuracy 1 σ analog 15...

Страница 43: ...nalog HS1 HS2 GPS L1 C A GLONASS L1OF QZSS L1 C A SBAS L1 C A Ready Galileo E1B E1C QZSS L1S Channels 26 channels GPS GLONASS QZSS SBAS Sensitivity GPS Tracking 161 dBm Hot Start 161 dBm Warm Start 147 dBm Cold Start 147 dBm Reacquisition 161 dBm GLONASS Tracking 157 dBm Hot Start 157 dBm Warm Start 143 dBm Cold Start 143 dBm Reacquisition 157 dBm With Novus recommended antenna GNSS Receiver HS3 H...

Страница 44: ... 5 Vdc Frequency 1574 1607 MHz Nominal Gain 2 dBic Amplifier gain 26 dB Noise Figure 2 0 dB Out of Band rejection Fo 50MHz 60 dBc Fo 60 MHz DC current 25 ma 3 5 Vdc Remote interface control Protocol RS232 NMEA 0183 Connector DB 9 Location Rear panel Protocol Bit plus stop Standard Baud Rates Selectable 4800 9600 19200 38400 57600 or 115200 bps SNMP option Remote monitoring control Internet Paramet...

Страница 45: ... charges prepaid by Buyer see RMA policy in Terms and conditions and c NOVUSs examination of such unit shall disclose to its satisfaction that such defect s exist and have not been caused by misuse neglect improper installation improper storage unauthorized modifications inadequate maintenance operation outside the environmental specifications for the product repair alteration or accident NOVUS as...

Страница 46: ... THE IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE IN ALL CIRCUMSTANCES NOVUS MAXIMUM LIABILITY IS LIMITED TO THE PURCHASE PRICE OF THE PRODUCTS SOLD NOVUS SHALL NOT UNDER ANY CIRCUMSTANCES BE LIABLE UPON A CLAIM OR ACTION IN CONTRACT TORT INDEMNITY OR CONTRIBUTION OR OTHER CLAIMS RELATING TO THE PRODUCTS IT SELLS WHICH EXCEEDS THIS LIABILITY LIMIT NOVUS SHALL NOT BE LI...

Страница 47: ...USERS GUIDE NR2310D ROG REVISION N DATE 031121 Page 47 www novuspower com SPECIAL INCIDENTAL OR CONNSEQUENTIAL DAMAGES WHETHER BASED ON CONTRACT TORT OR ANY OTHER LEGAL THEORY ...

Страница 48: ...S Appendix C GPNVS Status String Definitions All information provide herein is the proprietary property of Novus Power Products L L C The information included may be reproduced without the permission of Novus Power Products L L C with out prior approval for purpose of operating the equipment ...

Страница 49: ...Status String GPNVS 6 Status Bytes Rubidium 10 1 7 Status String GPNVS 7 Status Bytes 11 1 8 Event String GPNVS 8 Event Status 12 1 9 Status String GPNVS 9 Frequency Measurement 13 1 9 1 Standard Frequency Measurement String 13 1 9 2 NR6720 HS Frequency Measurement String 14 1 10 PPS Alignment String GPNVS 10 PPS Status 15 1 12 PPS Alignment String GPNVS 9 PPS Status 16 1 11 Response String GPNVS ...

Страница 50: ...nitoring will be set up to meet the following protocols These are designed to be standardized across different products and easy to port and use via serial to ethernet connections Many products will have some but not all of the following strings if configured for the optional status RS232 The following products comply with this document 1 ND0115 2 NR2310 OG 3 NR2315 4 NR2110 O 5 NR2110 OG Separate...

Страница 51: ... V Not Valid N N A 6 GPS 2 Lock Valid A Valid V Not Valid N N A 7 of Sats in View 1 Greater of GPS or GNSS count N N A 8 of Sats in View 2 Greater of GPS or GNSS count N N A 9 Channel Fault Byte 0x0000 to 0xFFFF Hex OR d value 10 Power Supply Fault Byte 0x00 to 0xFF Hex OR d value 11 Error Message Byte 0x00 to 0xFF Hex OR d value 12 Antenna 1 0 Ok 1 Error N N A 13 Antenna 2 0 Ok 1 Error N N A 14 N...

Страница 52: ... Date mmddyy 5 Channel 1 Vrms 0 00 to 3 30 V 6 Channel 2 Vrms 0 00 to 3 30 V 7 Channel 3 Vrms 0 00 to 3 30 V 8 Channel 4 Vrms 0 00 to 3 30 V 9 Channel 5 Vrms 0 00 to 3 30 V 10 Channel 6 Vrms 0 00 to 3 30 V 11 Channel 7 Vrms 0 00 to 3 30 V 12 Channel 8 Vrms 0 00 to 3 30 V 13 NMEA Checksum XX xor d value of bytes between and Example GPNVS 2 233518 092516 2 56 2 48 2 51 2 60 2 44 2 53 2 51 2 60 6C No...

Страница 53: ...pply 5 30 0 to 30 0 V 10 Power Supply 6 30 0 to 30 0 V 11 Power Supply 7 30 0 to 30 0 V 12 Power Supply 8 30 0 to 30 0 V 13 Built in Test BIT 0 Ok 1 Fail 14 Temperature C 40 to 99 15 NMEA Checksum XX xor d value of bytes between and Example GPNVS 3 233518 092516 7 84 7 93 11 8 12 1 0 00 0 00 0 00 1 92 0 26 62 Note Depending on configuration Power Supply values will be defined differently and some ...

Страница 54: ...te mmddyy 5 Channel 9 Vrms 0 00 to 3 30 V 6 Channel 10 Vrms 0 00 to 3 30 V 7 Channel 11 Vrms 0 00 to 3 30 V 8 Channel 12 Vrms 0 00 to 3 30 V 9 Channel 13 Vrms 0 00 to 3 30 V 10 Channel 14 Vrms 0 00 to 3 30 V 11 Channel 15 Vrms 0 00 to 3 30 V 12 Channel 16 Vrms 0 00 to 3 30 V 13 NMEA Checksum XX xor d value of bytes between and Example GPNVS 4 233518 092516 2 56 2 48 2 51 2 60 2 44 2 53 2 51 2 60 6...

Страница 55: ...s GPNVS 5 hhmmss ddmmyy nnn nn nn XX 1 2 3 4 5 6 7 8 Description Range 1 Identifier GPNVS 2 String ID 5 3 Time UTC hhmmss 4 Date mmddyy 5 Potentiometer Hex Value 000 to FFF 6 Fan PWM 0 to 90 7 Temperature 40 to 99 C 8 NMEA Checksum XX xor d value of bytes between and Example GPNVS 5 233518 092516 45 00 25 70 ...

Страница 56: ...Identifier GPNVS 2 String ID 6 3 Active PCB Assembly 0 or 1 4 GNSS Lock A Locked V Unlocked 5 Input Error 0 Ok 1 A Error 2 B error 6 Channel Status Word 0x0000 to 0xFFFF 7 Primary PS Status 0x00 to 0xFF 8 Secondary PS Status 0x00 to 0xFF 9 Active PCB Status 0x00 to 0xFF 10 Checksum Status 00 to 999 11 Channel Fault Bin 0x0000 to 0xFFFF 12 Primary PCB Amp Status 0x0000 to 0xFFFF 13 Backup PCB Amp S...

Страница 57: ...dium GPNVS 6 nnn 0x0000 nnn 0 1 XX 1 2 3 4 5 6 7 Description Range 1 Identifier GPNVS 2 String ID 6 3 Heat Sink Temperature 0 255 4 Heater Current Voltage 0x0000 0x0136 5 Measured Voltage in Heater 0 255 6 Rb Locked 0 Unlocked 1 Locked 7 NMEA Checksum XX xor d value of bytes between and Example GPNVS 9 136 0x002A 90 1 7E ...

Страница 58: ...hhmmss 4 Date mmddyy 5 GPS Lock A Valid V Not Valid 6 of Sats in View 1 Greater of GPS or GNSS count N N A 7 Error Byte 0x00 to 0xFF 8 Freq Diff 999 last count clock cycles 9 PPS Diff 999 last count clock cycles 10 Freq Correction Slice 999 DAC bits per second 11 DAC Value Integer Representation n x 1 2 20 12 Power Supply Vdc 13 Power Supply Vdc 14 NMEA Checksum XX xor d value of bytes between and...

Страница 59: ...f 1 On 5 Event Enabled System 0 Events Disabled 1 Events Enabled 6 GPS Lock Achieved 0 No Lock 2 Locked or previously locked 7 Event Index 0 512 Current count of events in RAM 8 Event Errors RAM 0 9 Event Index 0 512 Current count of events in Flash 10 Event Errors Flash 0 11 Event Time Alignmet 2 LS applied 1 GPS 0 RTC 12 Estimated Accuracy 0 999999 ns 13 Edge Detect Direction 0 Falling Edge 1 Ri...

Страница 60: ...0 1 9 1 Standard Frequency Measurement String GPNVS 9 hhmmss ddmmyy n nnnnnnn nnn nnn nn XX 1 2 3 4 5 6 7 8 Description Range 1 Identifier GPNVS 2 String ID 9 3 Time UTC hhmmss 4 Date mmddyy 5 Measured Frequency 9999900 000 to 10000100 000 6 Frequency Alert Range 0 240 units of 0 0083 Hz 7 Temperature 40 to 99 C 8 NMEA Checksum XX xor d value of bytes between and Example GPNVS 9 233518 092516 1000...

Страница 61: ...XX 1 2 3 4 5 6 7 8 9 Description Range 1 Identifier GPNVS 2 String ID 9 3 Frequency Loop Period 10000000 000 4 DAC Voltage Double 2 00000 5 Frequency per second 10000000 0 6 Loop Period 0 99 7 Antenna Current Mon 0 00 to 3 30V 8 Sine Output RMS 0 00 to 3 30V 9 NMEA Checksum XX xor d value of bytes between and Example GPNVS 9 10000000 003 1 97493 10000000 0 15 1 03 1 30 4A ...

Страница 62: ...c PPS 1 GPS PPS 6 PPS Difference 250 ns 7 PPS Avg Difference 250 ns 8 PPS Avg Count 1 20 9 PPS Synch Threshold 1 250 10 PPS pull Cal Factor 0 1 to 10 0 11 PPS active Time Cal Factor 0 to 9 12 Frequency Variance 0 9999 clock cycles per Loop period 13 Frequency Var Threshold 0 100 clock cycles per Loop period 14 PPS Stabile Mode Post Warm up 0 Off 1 On 15 PPS Slope Indicator 250 clock cycles per sec...

Страница 63: ...GPNVS 9 nnn 0x0000 nnn 0 1 XX 1 2 3 4 5 6 7 Description Range 8 Identifier GPNVS 9 String ID 9 10 Heat Sink Temperature 0 255 11 Heater Current Voltage 0x0000 0x0136 12 Measured Voltage in Heater 0 255 13 Rb Locked 0 Unlocked 1 Locked 14 NMEA Checksum XX xor d value of bytes between and Example GPNVS 9 136 0x002A 90 1 7E ...

Страница 64: ...er com 1 11 Response String GPNVS R GPNVS R n response XX 1 2 3 4 5 Description Range 1 Identifier GPNVS 2 Response ID R 3 Command Success 1 Success 0 Fail 4 Response see example responses 5 NMEA Checksum XX xor d value of bytes between and Example GPNVS R SET01 1 00 6F ...

Страница 65: ...3 Priority Discipline Source 0 GNSS 1 10MHz input 2 Optical input 4 Current Discipline Source 0 GNSS 1 10MHz 2 Optical 3 Holdover 5 GNSS Lock 0 to 3 0 Unlocked 3 Fully Locked 6 RF Present 0 No RF source 1 RF Source found 7 Opto Present 0 No Optical source 1 Optical Source Found 8 Loop Lock 1 Lock 0 Loop acquiring lock 9 Reserved 10 NMEA Checksum XX xor d value of bytes between and Example GPNVS 13...

Страница 66: ...1 17 Time UTC hhmmss 18 Date mmddyy 19 GPS Lock Valid A Valid V Not Valid 20 of Sats in View Greater of GPS or GNSS count 21 Channel Fault Byte 0x00 to 0x3F Hex OR d value 22 Power Supply Fault Byte 0x00 to 0x1F Hex OR d value 23 Error Message Byte 0x00 to 0x0F Hex OR d value 24 NMEA Checksum XX xor d value of bytes between and Example GPNVS 1 233518 092516 A 10 0x00 0x00 0x00 62 Time 23 35 18 Sep...

Страница 67: ...escription Range 14 Identifier GPNVS 15 String ID 2 16 Time UTC hhmmss 17 Date mmddyy 18 Channel 1 Vrms 0 00 to 6 60 V 19 Channel 2 Vrms 0 00 to 6 60 V 20 Channel 3 Vrms 0 00 to 6 60 V 21 Channel 4 Vrms 0 00 to 6 60 V 22 Channel 5 Vrms 0 00 to 6 60 V 23 Channel 6 Vrms 0 00 to 6 60 V 24 NMEA Checksum XX xor d value of bytes between and Example GPNVS 2 233518 092516 0 99 1 01 1 06 0 97 1 52 1 54 4E ...

Страница 68: ...0 Description Range 15 Identifier GPNVS 16 String ID 2 17 Time UTC hhmmss 18 Date mmddyy 19 5Vdc Power Supply opt 30 0 to 30 0 V 20 5Vdc Power Supply 30 0 to 30 0 V 21 10kΩ Thermistor opt 0 00 to 3 30 V 22 5Vdc Power Supply opt 30 0 to 30 0 V 23 OCXO Control Voltage 0 00 to 3 30 V 24 NMEA Checksum XX xor d value of bytes between and Example GPNVS 3 233518 092516 4 84 4 93 1 45 4 90 2 12 42 ...

Страница 69: ...hannel 14 Fault 0x1 14 Channel 15 Fault Channel Fault Bin Hex Value OR d Channel ID Channel Fault Bin 0x1 0 Channel 1 Fault External Fault The ND0100 has completed an internal amplifier gain test and both primary and backup assemblies are functional The fault is external to the ND0100 cabling short etc Amp Gain Test for Alert is enabled with AMP 1 command via RS232 0x1 1 Channel 2 Fault 0x1 2 Chan...

Страница 70: ... 9 Channel 10 Fault 0x1 10 Channel 11 Fault 0x1 11 Channel 12 Fault 0x1 12 Channel 13 Fault 0x1 13 Channel 14 Fault 0x1 14 Channel 15 Fault Backup PCB Amp Status Hex Value OR d Channel ID Backup PCB Amp Status 0x1 0 Channel 1 Fault Internal Fault Backup Assembly The channel has failed an internal gain test on the backup PCB assembly and the channel is not functional on the secondary board Amp Gain...

Страница 71: ...l 0x1 5 Reserved 0x1 6 Reserved 0x1 7 Reserved Primary and Secondary Power Supply Status Hex Value OR d Status Message 0x1 0 PS 1 Fault 0x1 1 PS 2 Fault 0x1 2 PS 3 Fault 0x1 3 PS 4 Fault 0x1 4 PS 5 Fault 0x1 5 PS 6 Fault 0x1 6 PS 7 Fault 0x1 7 PS 8 Fault Error Status Hex Value OR d Status Message 0x1 0 FLASH_NOT_FOUND 0x1 1 FLASH_NOT_SAVED 0x1 2 LOOP_VOLT_ERROR 0x1 3 ANTENNA_VOLT_ERROR 0x1 4 GPS_F...

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