Orolia GNSSource-1000 User manual

19 December 2022
GNSSource-1000
Smart, Low-Cost & High Performance GNSS OCXO
Reference Source
User Manual
Document Part No: GNSSource-1000_Manual
Revision: 191222

Contents
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............................................................................................................................................................................................. 7
3.1 Operating Modes ...................................................................................................................................................................................... 7
3.2 Operating Mode Setup .......................................................................................................................................................................... 7
3.3 Normal Power / On sequence ........................................................................................................................................................... 7
4. System Description.............................................................................................................................................................................................8
4.1Block diagram............................................................................................................................................................................................. 8
4.2 THE TIMING AND TRACKING SYSTEM OF THE GXCLOCK ..............................................................................................9
4.2.1 THE “TRACK” MODE AND THE “SYNC” MODE................................................................................................... 10
4.2.2 THE FREQUENCY LEARNING ...................................................................................................................................... 10
4.2.3 THE FREQUENCY IN USE............................................................................................................................................... 10
4.2.4 THE PPS TRACKING LOOP ............................................................................................................................................11
4.2.5 TRACKING LIMITS AND ALARMS ................................................................................................................................11
4.2.6 FREQUENCY FLUCTUATIONS DURING THE TRACKING.............................................................................. 12
4.2.7FINE PHASE COMPARATOR OFFSET..................................................................................................................... 12
4.2.8 THE AUTOMatical RESTART OF THE TRACKING.............................................................................................. 12
4.3 SIMPLE SERIAL INTERFACE OPERATION...............................................................................................................................12
4.3.1 INTRODUCTION................................................................................................................................................................... 12
4.3.2 SERIAL INTERFACE CONNECTION .......................................................................................................................... 13
4.3.3 GXClock INTERNAL PARAMETERS MONITORING............................................................................................13
4.3.4 CENTRE FREQUENCY ADJUSTMENT WITH THE SERIAL INTERFACE ................................................13
4.3.5 CENTER FREQUENCY READ-BACK.........................................................................................................................14
4.4 Status & Alarms.......................................................................................................................................................................................14
5. Timing & Locking Control Functions extended list...........................................................................................................................14
5.1 INFORMATION COMMANDS ...........................................................................................................................................................14
5.2 TRACKING COMMANDS .................................................................................................................................................................... 15
5.3 PPSOUT COMMANDS......................................................................................................................................................................... 15
5.4 DATE / TIME COMMANDS................................................................................................................................................................ 15
5.5 SETTING COMMANDS ........................................................................................................................................................................ 15
5.6 OTHER COMMANDS............................................................................................................................................................................ 15
5.7 DEVICE STATUS.................................................................................................................................................................................... 43
5.7.1 STATUS BROADCASTED BY MESSAGES............................................................................................................. 43
5.8 THE MAvxx.. SYSTEM..........................................................................................................................................................................44
5.8.1 INTRODUCTION.................................................................................................................................................................. 44
5.9 MAVxx.. PARAMETERS DESCRIPTION FOR THE GXClock............................................................................................. 45
5.9.1 Clock main parameters .................................................................................................................................................... 45
5.9.2 GPS main parameters....................................................................................................................................................... 45
5.10 SERIAL COMMUNICATION INTERFACE 2...............................................................................................................................68

5.11 The NMEA messages........................................................................................................................................................................... 69
5.11.1 Conditions : ............................................................................................................................................................................ 69
5.11.2 Messages activation:.......................................................................................................................................................... 69
5.11.3 Messages cancellation: ..................................................................................................................................................... 69
5.11.4 The NMEA messages list: ................................................................................................................................................ 69
5.11.5 Message NMEA $PTNTA................................................................................................................................................. 70
5.11.6 Message NMEA $PTNTS,B............................................................................................................................................. 70
5.11.7 Message NMEA $GPRMC ............................................................................................................................................... 72
5.11.8 Message NMEA $GPZDA ................................................................................................................................................ 73
5.12 THE NMEA $GPRMC mode .............................................................................................................................................................. 74
5.13 Special commands ................................................................................................................................................................................ 75
5.14 Time of Day Command Synchronization.................................................................................................................................... 76
5.15 Time tagging on the PPSREF input and the BT8 command............................................................................................ 77
5.16 Signification of the BT9 message.................................................................................................................................................. 77
5.17 Time and date in use in the iSync clock...................................................................................................................................... 78
5.18 The time constant of the PI loop, GXClock............................................................................................................................... 78
5.19 GXClock simplified state machine and Status indication ................................................................................................... 79
6. Annexes................................................................................................................................................................................................................. 80
6.1 Typical tunings ........................................................................................................................................................................................ 80
6.1.1 Start of a tracking............................................................................................................................................................... 80
6.1.2 Automatic start of the tracking.................................................................................................................................... 82
6.1.3 Low Time Interval Error with the PPSRef from the GPS................................................................................ 83
6.1.4 Very good short term frequency stability ...............................................................................................................84
6.1.5 Improved holdover performance ................................................................................................................................84
6.1.6 Tracking an external PPSREF....................................................................................................................................... 84
6.1.7 Direct communication with the GPS receiver....................................................................................................... 85
6.1.8 Testing the GPS jamming ............................................................................................................................................... 87

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1. Introduction
The GNSSource-1000 has been specifically designed for cross industry applications, including telecom and calibration,
requiring extremely stable and precise timing or frequency source.
The GNSSource-1000 integrates a GPS receiver, a smart GPS-disciplined OCXO clock, and distributes multiple output
signals, either phase or frequency aligned depending on the operating modes.
Definitions
This is a list of words and related definitions used in this manual to help the user understand the content:
Words Definitions
GNSSource-1000 Unit or product
Unit GNSSource-1000
System GNSSource-1000 and its integrated modules
GXClock-500 GNSS OCXO disciplined module
Track mode Frequency alignment between a reference and an output signal, regardless of the relative
phase position of the two signals. Also known as “syntonization”
Sync mode Phase alignment between a reference and an output signal. Also know as
synchronization”
Free-run mode Rubidium clock not locked to any reference, including GPS
Holdover mode Rubidium clock that was previously locked to a GPS reference but lost it or is no longer
present
2. Before Getting Started
2.1 Unpacking
Unpack and carefully inspect the unit. Check for physical damage. If physical damage is observed, please immediately
contact us.
Unit Supplies
•1x GNSSource-1000 unit
•1x GPS patch antenna with 5 meters (16.4’) cable with standard option
Note: For optional Rooftop GPS Antenna (Ordering code: RA)
This kit contains the following items:
- 1x roof antenna
- 1x cable of 15 meter (49’)
- 1x cable of 5 meter (16.4’)
- 1x lightning arrestor
•Cables SUB-D male/female for PC serial COM
•1x Power cable
•2x 19" rack mountable ears or tabletop feet
•1x Operating Manual + Specifications

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2.2 Safety!
- Use proper ESD precautions
- Ensure that all cables are properly connected
- For pluggable equipment, the socket-outlet shall be installed
near the equipment and shall be easily accessible.
- The integrity of the protective earth must be ensured.
•Handling the product in a reasonably foreseeable conditions do not cause any risk for human health, exposure
to the SVHC (substances of very high concern) would require grinding the component up.
Note: This equipment has been tested and found to comply with the limits for a Class A digital device, pursuant to
CE Rules. These limits are designed to provide reasonable protection against harmful interference when the
equipment is operated in a commercial environment. This equipment generates, uses, and can radiate radio
frequency energy and, if not installed and used in accordance with the instruction manual, may cause harmful
interference to radio communications. Operation of this equipment in a residential area is likely to cause harmful
interference in which case the user will be required to correct the interference at own expense.
2.3 Environmental Responsibility
•The equipment contains materials, which can be either re-used or recycled.
•Do not deposit the equipment as unsorted municipal waste. Leave it at an authorized local WEEE collection point or
return to Orolia Switzerland SA to ensure proper disposal.
•To return the appliance :
a. Download and fill up the RMA form (from orolia.com) and send it to [e-mail]
b. Once the RMA is approved, we will contact you with shipment process details.
2.4 Installation Procedure
2.4.1 Connections
2) Connect GPS antenna to J1 GPS antenna. Install the included patch antenna close to a
window

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Notes:
a) If the installed antenna is in a region susceptible to lightning, a surge arrestor must be installed. For
the installation, please refer to section “Safe GPS Antenna installation”.
b) Customize GPS Antenna. The customer can install their own desired Antenna. In such case, the
antenna connector of the device supplies 5V/30 mA for the amplifier.
c) GNSSource-1000 is CE tested only for an antenna cable less than 30 meters (98’).
3) Connect a COM cable between J2 and one COM available of your computer for RS232 commands and
monitoring (if required).
4) Place S2 in position “Free run”.
5) Switch On the system S1.
2.4.2 Software Monitoring
2.4.2.1 iSyncMgr Application
GNSSource-1000 operates independently. However, the smart integrated GXClock-500 module can be monitored
through GxClock-500 manager application. The latest version of this software can be downloaded from
https://www.orolia.com/documents/isyncmgr-gxclock-software/attachment
To start the application, please follow procedure below:
•Start the application with File Explorer
By default, the serial port is COM1. If a warning window pops up before the application GXClock manager starts,
the COM1 is not free and another port has to be selected. How? Go to “Serial Port \ PortNo”menu, then select
another available port.
Figure 1 – GXClock Manager.exe
•Once the serial port number is properly working, click on the “Refresh” button. The Identification, Serial Number
and Status of the smart Gxclock inside the GNSSource-1000 should be displayed .
Notes: a) GXClockmanager gives full monitoring access to the smart GXClok-500
b) Changes through these commands should be avoided as the dvice was factory optimized
2.4.2.2 Monitoring Through RS232 Terminal Communication Interface
The user can also use a serial communication RS232 to monitor the parameters of rubidium clock or to send specific
commands. For example, a hyper terminal communication can be used as follows:
RS232 protocol is:
9600 bits/s
8 data bits
No parity
1 stop bit
No handshake
Notes:
1) See chapter 6 for the list of commands

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3.System Operations
3.1 Operating Modes
The GNSSource-1000 integrates a smart GXClock-500 module integrating a GNSS receiver. It provides 4 basic modes
of operation as follows:
1. Free Run: When the GXClock is not locked to a GNSS reference and, thus, is free running
2. Track: When the GNSS reference is used to perform frequency alignment applications. It
uses the PPS_GNSS as a reference (PPSREF) to align the frequency of the OCXO clock, but
the phase is not aligned.
3. Sync: When the GNSS reference is used to perform phase alignment applications. The
PPSOUT of the GNSSource-1000 is aligned in phase with the GPS PPSREF input through the
internal PPSINT reference signal, which uses the SmarTiming+™ algorithm to 1) compare the
PPSOUT against the PPSREF signal at 1ns resolution within a +/-500ns dynamic range and 2)
auto-adaptively align them.
4. Holdover: When the GNSS signal is not present (NO PPSREF). The last averaged frequency
value is used for performance enhancement by the SmarTiming+™ algorithm
Note:
a) At power ON, the GXClock is factory configured to go in Sync after the Warm up delay.
3.2 Operating Mode Setup
The user can set up the operating mode only by software:
•Select desired operation mode through the GXClock manager application or send RS-232 commands. Example:
•Free Run: Send TR0
•Track: Send TR0, SY0 , TR1
•Sync: Send TR0, SY1 , TR1
•Holdover Disconnect GNSS antenna. Or with MAv parameter 0x04:1
Note:
a) See Chapter 6 for a list of supported RS-232 commands
3.3 Normal Power / On sequence
Sequence
Status
Duration
LED status
Comment / Possible trouble
Power
LED
Green
LED
Red
LED
Warm up
0
6
minutes
√
-
√
Duration too short or too long: Check MAv parameter 0x0E
Going in
tracking
1
1 minute
√
√
√
If duration longer than 5 minutes or Status:5 or 6, check GNSS
antenna. Then send TR0, TR1
Tracking
GNSS
3
√
√
-
Normal Sync situation
Holdover
6
√
√
√
Antenna issue

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4. System Description
4.1 Block diagram
Figure 3-1 Building block of the GXClock-500 module inside the GNSSource-1000

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4.2 THE TIMING AND TRACKING SYSTEM OF THE GXCLOCK
Figure 3-2 Timing system.
This iSync includes extended PPS (Pulse Per Second) facility. The hardware of this facility consists of two modules. The
first module is a timer clocked at 20 MHz. This timer tags the PPSREF coming from the internal GPS or from the outside,
pin 11, and generates two other PPS. The first one is called PPSINT and is used internally. The second one is called
PPSOUT and appears on pin 10 of the connector.
The second module is a phase comparator with 1 ns resolution and 1 µs range. This module compares the phase between
PPSREF and PPSINT. The phase information is used for the perfect tracking of a low noise PPSREF and for calculating
the noise of this PPSREF. The calculation is used to adjust the time constant of the tracking loop. This way, a noisy
PPSREF can be directly connected to the device without adjustments by hard or software.

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4.2.1 THE “TRACK” MODE AND THE “SYNC” MODE.
Figure 3-3 "Track" mode and "Sync" mode.
When “track” mode is set-up, the PPSINT is aligned to the PPSREF within 50 ns and the device start to track it. At the
beginning the loop time constant is set to an arbitrary low value. Then the phase comparator starts the long-term
frequency stability analysis of the PPSREF and the loop time constant is set accordingly.
If “sync” mode is not active, the PPSOUT is let in the place where it was before going in tracking.
If “sync” mode is active, the PPSOUT is aligned to PPSINT, just after going in tracking if it was set already or just after it is
set elsewhere.
Remark: Just after the beginning of tracking, PPSINT is not perfectly aligned to PPSREF. The error can be as big as 50
ns. Of course, the tracking loop will cancel this error after some time.
4.2.2 THE FREQUENCY LEARNING
When the GXClock is tracking the PPSREF of the GPS, in reality, it aligns its frequency to the one of the GPS system.
The learning process is simply the memorization of this frequency from time to time to use it after a reset or Power-On.
By default, when the device is continuously and successfully tracking a PPSREF, the average value of the frequency is
saved in EEPROM every 24 hours.
With the command FSx, it is possible to cancel the learning or to make an immediate save.
4.2.3 THE FREQUENCY IN USE
With the PPSREF facilities, a different frequency can be in use in different situations. Let know first, that the frequency
just currently in use is located in a single register, and that this register can ever be read by the user. The command to
read this register is: FC??????.
On a device connected through the serial interface to a terminal, it is possible to follow the evolution of the tracking by
this way.
The frequency in use in different situations is as follows:
•After a Reset or Power-On, the value is copied from the EEPROM to the RAM and is used.
•When not in tracking, the command FCsddddd or the command Cxxxx, change the value in use and store it in
the EEPROM.
•At the beginning of a tracking, the value in use is the one of the EEPROM.

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•During a tracking, the value in use changes continuously to align as well as possible the PPSINT to the PPSREF.
A holdover frequency is also estimated continuously. By default, the holdover frequency is saved in EEPROM
every 24 hours.
•When the tracking is stopped intentionally, the device goes in FREE RUN and the value in EEPROM becomes in
use.
•If a tracking is stopped because of a degraded or a missing PPSREF, the iSync goes in HOLDOVER with the
holdover frequency previously estimated.
4.2.4 THE PPS TRACKING LOOP
The iSync is equipped with a numerical PI regulation loop to track the PPSREF. The time constant of the tracking loop is
either set automatically, or forced by the user with the command TCdddddd.
e
PPSINT
PPSREF
U
Osc
K
∫
dt
PI
regulator
Figure 3-4 Schematic of the PPSREF regulation loop.
By default the time constant is set automatically. In such situation, the optimum loop time constant is computed from
information’s like PPSREF noise and temperature fluctuations. If this information is missing, the time constant is slowly
forced to 1000 second in the GXClock.
4.2.5 TRACKING LIMITS AND ALARMS
If the frequency between the iSync and the master to track is too large, after some time, the phase time error between
PPSINT and PPSREF can become too big for some applications.
There are two limits. If the phase time error becomes bigger than the first limit, an alarm is raised up, but the tracking
continues. If the phase time error comes bigger than the second limit, then the tracking stops. The first limit is called (no)
alarm window and the second window tracking window. The value of the half (no) alarm window can be changed by the
user with the command AWddd. For the GXClock, the default value is ± 20µs. The value of the half tracking window can
be changed by the user with the command TWddd. For the GXClock, the default value is ± 60µs. For more details, see
the Chapter “TIMING AND TRACKING COMMANDS”.
Figure 3-5 Tracking limits.

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4.2.6 FREQUENCY FLUCTUATIONS DURING THE TRACKING
By default, during a tracking, the GXClock is able to tune it's frequency on the nearly full range given by a 16
bit number. In reality from FC-32765 to FC+32765. Or in relative frequency: > ±4e-7.
In case the frequency limit is reached during a tracking, no error will be raised up as long the phase time error is staying
in the (no) alarm window.
So high frequency variations are may be not acceptable in some applications. In such case it is possible to lower the limit
by software tuning, See MAv.. parameters, Frequency limit.
4.2.7 FINE PHASE COMPARATOR OFFSET
This fine offset adjustment can be used in case of precise phase calibration. The range of the offset is +127/ - 128 steps
of the fine phase comparator. As the fine comparator works analogue, a step corresponds to approx. 1 ns. The
command to put the offset is COsddd
Figure 3-6 schematic of the analog fine phase comparator regulation loop
4.2.8 THE AUTOMatical RESTART OF THE TRACKING
In a situation where just a frequency disciplining is asked, like in a laboratory, it is recommended to allow the
automatically restart of the tracking by setting MAv parameter 0x06, bit 2 to 1.
In other situations, like synchronization of a base station to the GPS constellation, it is recommended to not allow this
automatically restart by setting MAv parameter 0x06, bit 2 to 0. This way GPS receiver anomaly may be cancelled. But
this induce stacking in Status=5 problem. To fix up this, it is recommended to restart the tracking (local controller).
4.3 SIMPLE SERIAL INTERFACE OPERATION
4.3.1 INTRODUCTION
The GXClock is equipped with a micro-controller which supervises the normal working of the device. All the working
parameters are stored in a built-in EEPROM memory.
The built-in serial interface allows an automatic parameter adjustment during the manufacturing.
The serial interface serves also for the monitoring and tuning of the internal parameters and the PPS facilities.

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4.3.2 SERIAL INTERFACE CONNECTION
The data transfer from the GXClock can be made by direct connection to a PC or standard terminal.
The data transfer parameters are the following:
bit rate: 9600 bits/s.
parity: none
start bit: 1
data bits: 8
stop bit: 1
IMPORTANT NOTE:
In most cases, the serial PC interface accepts the 0 to 5V level and a direct connection can be made. In case this 0 to
5V standard is not working, please refer to the small adaptation circuit called ‘RS 232 adapter circuit’
described in annex I.
4.3.3 GXClock INTERNAL PARAMETERS MONITORING
The internal parameters monitoring is made via the serial interface and with the use of single command "M" followed by
a carriage return character.
M<CR>[<LF>]
The GXClock will respond to this single character command with an eight ASCII / HEX coded string which looks like:
HH GG FF EE DD CC BB AA <CR><LF>
Where each returned byte is an ASCII coded hexadecimal value separated by a <Space> character.
The values are indicative and not scaled.
HH: reserved
GG : PCB temperature
FF : reserved
EE
: reserved
DD : OCXO Voltage Control
CC : reserved
BB : reserved
AA : reserved
PCB temperature [Celsius] = 0xGG * 0.5859 - 10.0
4.3.4 CENTRE FREQUENCY ADJUSTMENT WITH THE SERIAL INTERFACE
A single character command is available to the user for center frequency adjustment.
Cxxxx <CR>[<LF>] : output frequency correction through the synthesizer, by steps of approx. 6·10-12, where xxxx is
a signed 16 bits integer in hexadecimal string representation.
This value is stored in an EEPROM as last frequency correction which is applied after RESET or power-ON operation.
* Warning : This command can act into non volatile memory. Numbers of commands sent during the whole unit life time
limited to 100'000 in total (all commands cumulated). See MAv06: 4 parameter to cancel the eeprom writing. (Since
Version 2013-12-02)
•The argument of this command can vary from 0x8000 to 0x7FFF (-32768 to 32767).
•In track state, the frequency is changed internally by the software for optimum alignment and this command is
no more active.
•The basic command FCsddddd does the same.
•Even if MAv06:4 parameter is settled to cancel the writing in eeprom of FC, a writing in eeprom is anyway
possible if the command FCsddddd is followed by the command FS3

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Examples:
C0000<CR> : return to the nominal value (factory setting).
C0010<CR> : the actual frequency is increased of 16 steps.
CFFF0<CR> :the actual frequency is decreased of 16 steps.
4.3.5 CENTER FREQUENCY READ-BACK
R05<CR>[LF] : read-back high byte of user frequency correction actually in use.
R06<CR>[LF] : read-back low byte of user frequency correction actually in use.
L05<CR>[LF] : read-back high byte of user frequency correction in use after RESET or power-ON.
L06<CR>[LF] : read-back low byte of user frequency correction in use after RESET or power-ON.
-In track state, the value of these registers is subject to be changed by the software for optimum alignment.
4.4 Status & Alarms
Status Device ok
Alarm
Track Mode
Sync Mode
Pin 7
LED Green
Pin 13
LED red
Pin 13
LED red
S=0 warming up
(Low)(4)
(OFF)(4)
High
ON
High
ON
S=1 tracking set-up
High
ON
High
ON
High
ON
S=2 track to GPS (PPSREF)
High
ON
Low
OFF
N/A
N/A
S=3 Sync to GPS (PPSREF)
High
ON
N/A
N/A
Low
OFF
S=4 FreeRun. Track OFF
High
ON
High
ON
High
ON
S=5 HO(1) PPSREF unstable
High
ON
High
ON
High
ON
S=6(3) HO(2) No PPSREF
High
ON
High
ON
High
ON
S=7 Factory used
High
ON
High
ON
High
ON
(1) HO means Hold Over. Device still in Free Run if PPSREF unstable during tracking set-up
(2) HO means Hold Over : Device still in Free Run if No PPSREF during tracking set-up
(3) Status =6 also if GPS message activated (MAv22: Bit0:1) AND missing or defective GPS messages
Remarks: It is possible to deactivate “Device OK” and “Alarm” by SW, (MAv04:Bit6:1) In such case, pins 7,13 are Low
and LED’s OFF
5. Timing & Locking Control Functions extended list
Extended commands beginning with 2 characters are implemented in the device for efficient managing, setting, tuning,
reading back and surveying. Like the 1 character commands, this commands use the serial port 1.
5.1 INFORMATION COMMANDS
ID
Identification.
SN
Serial number.
ST
General Status.
BTx
Beat a message (every second) on the serial port.
VS
View PPSRef Sigma.
VT
View Time constant.

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5.2 TRACKING COMMANDS
TRx
Tracking start and stop.
SYx
PPSOUT synchronization.
AWddd
Set the no alarm window during a tracking.
TWddd
Set the tracking window during a tracking.
TCdddddd
Set tracking loop time constant.
FSx
Set frequency saving.
COsddd
Set phase comparator Offset.
RAsddd
Raw phase adjust.
5.3 PPSOUT COMMANDS
PWddddddddd
Set the PPSOUT pulse width.
DEddddddddd
PPSOUT delay.
PPdddeee
Set PPSOUT cadence and initial phase.
5.4 DATE / TIME COMMANDS
DT
Send out the date.
DTyyyy-mm-dd
Set the date.
TD
Send out the time of day.
TDhh:mm:ss
Set the time of day.
5.5 SETTING COMMANDS
FCsddddd
Change frequency.
MAvxx..
Module adjust. Set and read internal parameters.
5.6 OTHER COMMANDS
FREEZEx
Freeze frequency.
RESET
Hot Reset.

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INFORMATION COMMAND: ID Identification.
ID<CR><LF>
Identification.
Answer:
SPTSXO-002/rr/s.ss<CR><LF>
rr:
revision number
s.ss:
software version
Factory setting:
-
EEPROM modification :
No
Data in :
FLASH
MAv access :
Yes
Reset value:
-
Example
Command
Answer
Comment
ID<CR>
SPTSXO-002/00/2.10<CR><LF>
-

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INFORMATION COMMAND: SN Serial number.
SN<CR><LF>
Serial number.
Answer:
aaaaaa<CR><LF>
aaaaaa:
6 characters serial number
Factory setting:
-
EEPROM modification :
No
MAv access:
No
Reset value:
-
Example
Command
Answer
Comment
SN<CR>
G00098<CR><LF>
-

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INFORMATION COMMAND: ST General Status.
ST<CR><LF>
General Status.
Answer:
s<CR><LF>
s:
Status.
0: warming up
1: tracking set-up
2: track to PPSREF
3: sync to PPSREF
4: Free Run. Track OFF
5: PSREF unstable (Holdover)
6: No PPSREF (Holdover)
7: frequency frozen
8: factory used
9: fault
Factory setting:
-
EEPROM modification :
No
Data in :
RAM
MAv access :
No
Reset value:
(0)
Notes
•The Status is also transmitted every second with BT5, BT7.
•The Status is also included in the NMEA messages $PTNTA, $PTNTS,B.
Example
Command
Answer
Comment
ST<CR>
4<CR><LF>
Status=4, free run.

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INFORMATION COMMAND: BTx Beat a message (every second) on the serial port.
BTx<CR><LF>
Beat a message (every second) on the serial port.
x:
message to beat.
0:
no beat.
BT1<CR><LF>
Beat effective time interval PPSOUT vs PPSREF.
Answer:
ddddddddd<CR><LF>
ddddddddd:
delay in ns.
BT2<CR><LF>
Beat fine phase comparator value.
Answer:
sppp<CR><LF>
sppp:
s: +/- ppp: value in approx. ns.
BT3<CR><LF>
Beat effective time interval PPSOUT vs PPSREF + fine phase comparator value.
Answer:
ddddddddd sppp<CR><LF>
ddddddddd:
delay in ns.
sppp:
s: +/- ppp: value in approx. ns.
BT4<CR><LF>
Beat time of day.
Answer:
hh:mm:ss<CR><LF>
hh:mm:ss
hh: hour mm: minute ss: second
BT5<CR><LF>
Beat general status.
Answer:
x<CR><LF>
x: general status. See STx command
BT6<CR><LF>
Beat <CR><LF>.
Answer:
<CR><LF>
just <CR><LF>
BT7<CR><LF>
Beat Date, Time, Status.
Answer:
yyyy-mm-dd hh:mm:ss x<CR><LF>
yyyy-mm-dd
yyyy: year mm: month dd: day
hh:mm:ss
hh: hour mm: minute ss: second
x: general status. See STx command
BT8<CR><LF>
Time tagging of PPSREF vs PPSINT as soon as PPSREF is arrived.
Answer:
ssssssssss.nnnnnnnnn<CR><LF>
ssssssssss:
Seconds elapsed since 2000-01-01 00:00:00.
nnnnnnnnn:
Residual in ns. Rounded to: 50ns. (GXClock)
BT9<CR><LF>
Send GPS receiver message status as soon GPS messages are arrived
Answer:
x<CR><LF>
x:
See BT9 Note
BTA<CR><LF>
Beat NMEA message $PTNTA

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BTB<CR><LF>
Beat NMEA message $PTNTS,B
BTR<CR><LF>
Beat NMEA message $GPRMC
BTZ<CR><LF>
Beat NMEA message $GPZDA
Factory setting:
0
EEPROM modification :
No
Data in :
RAM
MAv access :
No
Reset value:
0
Notes
•BT8 can work as time tagging for PPSREF.
•BT1 BT3 output ????????? if there is no PPSREF .
•Regarding the phase comparator, no precision or linearity can be expected. This comparator just increases the
resolution of the phase used by the tracking algorithm.
•This command is just for debugging. To store a beat behavior in EEPROM, one should use MAv parameters
0x0B and 0x0C.
Example
Command
Answer
Comment
BT5<CR>
..3<CR><LF>..3<CR><LF>..
Status=3, sync, in tracking.