Orolia iSync+ Smart GXClok-500 User manual

iSync+® Smart GXClok™-500 Manual

July 31, 2019

sales@spectratime.com Switzerland Headquarters

www.spectratime.com +41.32.732.16.66

Specifications are subject to change without prior notice. An Orolia Group Business

Smart & Fully Integrated GPS/GNSS Receiver & Crystal Oscillator Module (GXClok-500)

Patented Smart GXClok-500

Auto-Adaptive GPS/GNSS SmarTiming+

®

Technology

Applications

Telecom | Navigation | Broadcast | Defense | Instrument

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Table of Content :  
Revision list:...................................................................................................................................................................... 4 
Introduction ....................................................................................................................................................................... 5 
System description ........................................................................................................................................................... 5 
1  Block diagram ......................................................................................................................................... 5 
2  THE TIMING AND TRACKING SYSTEM OF THE GXCLOCK .............................................................. 6 
2.1  THE “TRACK” MODE AND THE “SYNC” MODE. .............................................................................. 7 
2.2  THE FREQUENCY LEARNING .......................................................................................................... 7 
2.3  THE FREQUENCY IN USE ................................................................................................................ 7 
2.4  USER FREQUENCY CORRECTION ................................................................................................. 8 
2.5  THE PPS TRACKING LOOP .............................................................................................................. 8 
2.6  TRACKING LIMITS AND ALARMS .................................................................................................... 8 
2.7  FREQUENCY FLUCTUATIONS DURING THE TRACKING.............................................................. 9 
2.8  FINE PHASE COMPARATOR OFFSET............................................................................................. 9 
2.9  THE AUTOMATICAL RESTART OF THE TRACKING ...................................................................... 9 
GXClock INSTALLATION AND OPERATION................................................................................................................. 10 
1  INTRODUCTION................................................................................................................................... 10 
2  Safety! ................................................................................................................................................... 10 
3  Environmental Responsibility ................................................................................................................ 10 
4  SHIPPING AND RECEIVING INFORMATION ..................................................................................... 10 
5  MOUNTING ........................................................................................................................................... 11 
5.1  RF jamming of the GPS .................................................................................................................... 12 
5.2  GXClock-500  PACKAGE. ................................................................................................................ 12 
5.3  PIN OUT ............................................................................................................................................ 12 
6  SIMPLE SERIAL INTERFACE OPERATION ....................................................................................... 13 
6.1  INTRODUCTION ............................................................................................................................... 13 
6.2  SERIAL INTERFACE CONNECTION ............................................................................................... 13 
6.3  GXClock INTERNAL PARAMETERS MONITORING ....................................................................... 13 
6.4  CENTRE FREQUENCY ADJUSTMENT WITH THE SERIAL INTERFACE .................................... 14 
6.5  CENTER FREQUENCY READ-BACK .............................................................................................. 14 
7  Status & Alarms .................................................................................................................................... 14 
Timing & Locking Control Functions extended list .......................................................................................................... 15 
1  INFORMATION COMMANDS .............................................................................................................. 15 
2  TRACKING COMMANDS ..................................................................................................................... 15 
3  PPSOUT COMMANDS ......................................................................................................................... 15 
4  DATE / TIME COMMANDS .................................................................................................................. 15 
5  SETTING COMMANDS ........................................................................................................................ 15 
6  OTHER COMMANDS ........................................................................................................................... 15 
7  DEVICE STATUS.................................................................................................................................. 43 
7.1  STATUS BROADCASTED BY MESSAGES .................................................................................... 43 
8  THE MAvxx.. SYSTEM ......................................................................................................................... 44 
8.1  INTRODUCTION ............................................................................................................................... 44 
9  MAVxx.. PARAMETERS DESCRIPTION FOR THE GXClock ............................................................. 45 
9.1  Clock main parameters ..................................................................................................................... 45 
9.2  GPS main parameters....................................................................................................................... 45 
10  SERIAL COMMUNICATION INTERFACE 2 ........................................................................................ 72 
11  The NMEA messages ........................................................................................................................... 73 
11.1  Conditions : ................................................................................................................................... 73 
11.2  Messages activation:..................................................................................................................... 73 
11.3  Messages cancellation: ................................................................................................................. 73 
11.4  The NMEA messages list: ............................................................................................................. 73 
11.5  Message NMEA $PTNTA ............................................................................................................. 74 
11.6  Message NMEA $PTNTS,B .......................................................................................................... 74 
11.7  Message NMEA $GPRMC ............................................................................................................ 76 
11.8  Message NMEA $GPZDA ............................................................................................................. 77 
12  THE NMEA $GPRMC mode ................................................................................................................. 78 
13  Special commands ................................................................................................................................ 79 
14  Time of Day Command Synchronization .............................................................................................. 80 
15  Time tagging on the PPSREF input and the BT8 command ................................................................ 81 
16  Signification of the BT9 message ......................................................................................................... 81 
17  Time and date in use in the iSync clock ............................................................................................... 82 

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18  The time constant of the PI loop, GXClock ........................................................................................... 83 
19  GXClock simplified state machine and Status indication ...................................................................... 84 
Annexes .......................................................................................................................................................................... 85 
1  Typical tunings ...................................................................................................................................... 85 
1.1  Start of a tracking .............................................................................................................................. 85 
1.2  Automatic start of the tracking. ......................................................................................................... 86 
1.3  Low Time Interval Error with the PPSRef from the GPS .................................................................. 87 
1.4  Very good short term frequency stability........................................................................................... 88 
1.5  Improved holdover performance ....................................................................................................... 88 
1.6  Tracking an external PPSREF .......................................................................................................... 88 
1.7  Direct communication with the GPS receiver ................................................................................... 89 
1.8  Testing the GPS jamming ................................................................................................................. 90 
 
 
 
 
 

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1 Revision list:

Software Revision (based on GXCLOCK-500 standard SW):

Hardware Revision :

Date

Version

Prompt / ID

Comment

2012-11-08

2.10

SPTSXO-002/00/2.10 2012-11-08

2012-12-10

2.10

SPTSXO-002/00/2.10 2012-12-10

Minor sw changes

2013-12-02

2.10

SPTSXO-002/00/2.10 2013-12-02

Command FC possibly don't write in eeprom

2014-05-13

2.10

SPTSXO-002/00/2.10 2014-05-13

TR1, SY1, warming delay of 320 seconds: settled

by default

2017-06-19

2.10

SPTSXO-002/00/2.10 2017-06-19

Minor sw changes

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2 Introduction

The GXClock-500 is a high performance crystal oscillator locked on a timing GPS receiver. Based on a

technology developed for Rb Clocks, it has exceptional performance in frequency spectral purity, timing and

holdover capability.

The GXClock-500 is a secure and synchronized time source for terrestrial communication systems.

3 System description

3.1 Block diagram

Figure 3-1 Building block of the GXClock-500

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3.2 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 s 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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3.2.1 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.

3.2.2 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.

3.2.3 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.

- 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.

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3.2.4 USER FREQUENCY CORRECTION

This correction is only possible in Free Run mode and is made with the command FCsddddd.

The command has 2 effects:

- Memorization of the asked frequency in EEPROM.

- Immediate use of the new frequency.

3.2.5 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.

3.2.6 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 ± 20s.

The value of the half tracking window can be changed by the user with the command TWddd. For the GXClock,

the default value is ± 60s. For more details, see the Chapter “TIMING AND TRACKING COMMANDS”.

(no) Alarm window

Command

AWxxxxx

value

Tracking window

Command

TWxxxxx

value

Fine comparator limits

Time phase error

(no) Alarm window

Command

AWxxxxx

value

Tracking window

Command

TWxxxxx

value

Fine comparator limits

Time phase error

Figure 3-5 Tracking limits.

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3.2.7 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.

3.2.8 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

3.2.9 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).

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4 GXClock INSTALLATION AND OPERATION

4.1 INTRODUCTION

This chapter of the manual contains information regarding the installation and operation of the SpT Model

GXClock. It is recommended to read this chapter carefully prior to operate the unit.

4.2 Safety!

- Use proper ESD precautions

- Ensure that all cables are properly connected

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.

4.3 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 www.spectratime.com) and send it to

WEEE@spectratime.com

b. Once the RMA is approved, we will contact you with shipment process details.

4.4 SHIPPING AND RECEIVING INFORMATION

The GXClock is packaged and shipped in a foam-lined box. The unit is inspected mechanically and electrically

prior to shipment. Upon receipt of the unit, a thorough inspection should be made to ensure that no damage has

occurred during shipping. If any damage is discovered, please contact

OROLIA SWITZERLAND SA

PHONE: +41 32 732 16 66

FAX: +41 32 732 16 67

CH-2000 NEUCHATEL / SWITZERLAND

Should it be necessary to ship the unit back, the original case and packing should be used. If the original case

is not available, a suitable container with foam-packing is recommended.

CAUTION

Care must be taken for the transportation of the GXClock to ensure that the maximum

acceleration due to a choc 50g/ 18ms is not exceeded.

GXClock contains crystal resonator.

When GXClock is integrated into an instrument, such instrument shall be packed in a

suitable container, similar to containers generally used for the transportation of

instruments like scope, video display or computer.

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4.5 MOUNTING

The unit should be mounted in preference to a metallic base-plate or thermal dissipater.

The device is designed for being directly mounted on the host instrument PCB. The device mounting depends

on the available space and the ambient temperature into the instrument.

CAUTION

Care must be taken to ensure that the maximum operating temperature

is not exceeded. (+/0°C as measured upper the OCXO).

This maximum temperature can be reached when operating the unit into forced air flow.

Vertical mounting is preferred to improve cooling by air connection around the OCXO.

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4.5.1 RF jamming of the GPS

The GXClock-500 is hosting a GPS receiver that is sensitive to RF jamming, especially near 1575 MHz. Avoid

to place the GXClock-500 nearby RF emitting devices. If jamming is suspected, it is possible to measure it with

indications given in "Typical Tunings" Chapter: Testing the GPS jamming.

4.5.2 GXClock-500 PACKAGE.

J100: GPS antenna MMCX in the PCB plane

J101: 10MHz output MMCX straight

J102: 10MHz output MMCX straight

J103: 10MHz output MMCX straight

J104: INTERFACE Hirose DF11-16DP-2DSA01

4.5.3 PIN OUT

J104

1

+10MHz LVDS

2

-10MHz LVDS

3

10MHz TTL

4

-1PPS LVDS

5

+1PPS LVDS

6

GND

7

Device OK 0-3V +5k

8

RX 232

9

TX RS232 (0-5V)

10

PPS TTL

11

1PPSIN C-MOS

12

GND

13

Alarm Track/Sync 0-3V +5k

14

GND

15

+12V

16

+12V

D200

D201

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4.6 SIMPLE SERIAL INTERFACE OPERATION

4.6.1 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.

4.6.2 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

If you experience problems with the serial interface, have a look into the FAQ section of the

www.spectratime.com web site.

4.6.3 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

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.

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4.6.4 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

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.

4.6.5 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.

4.7 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

S=3 Sync to GPS (PPSREF)

High

ON

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

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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.

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:

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

BTB<CR><LF>

Beat NMEA message $PTNTS,B

BTR<CR><LF>

Beat NMEA message $GPRMC

BTZ<CR><LF>

Beat NMEA message $GPZDA

iSync+

®

GXClok-500 Manual

sales@spectratime.com Switzerland Headquarters Page 20 of 90

www.spectratime.com +41.32.732.16.66

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.

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Orolia iSync+ Smart GXClok-500 User manual

Orolia iSync+ Smart GXClok-500 User manual

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