hopf 6875 Technical Description

Technical Description

GPS Satellite Controlled Clock

6875

Version 04.00 16.07.2008

COMPANY INFO

Page 2 GPS Satellite Controlled Clock 6875 - Ver. 04.00

hopf Elektronik GmbH

Nottebohmstr. 41 58511 Lüdenscheid
Postfach 1847 58468 Lüdenscheid

Tel.: ++49 (0)2351 / 9386-86
Fax: ++49 (0)2351 / 9386-93

Internet: http://www.hopf.com
e-mail: [email protected]

Safety information

The safety regulations and technical data are important for the smooth running of the devices and
the protection of people and equipment. Strict compliance with these regulations is required. In case
of non-compliance with these regulations the guarantee and warranty claims for the device expire.
There is no liability for possible consequential damages.

Safety of the Devices

The production of this device follows the latest technological standards and safety regulations.

The device must not be assembled by anyone but trained personnel. Please make sure that all the
connected cables are laid and fixed properly. The device is to be run with the supply voltage stated
on the identification plate only.

Only trained personnel or specialists may operate the device.

Repair on opened devices must not be carried out by anyone but specially trained staff or by the
hopf Elektronik GmbH company.

If the maintenance work requires the opening of a device or if a fuse needs changing the device
must be separated from all voltage supplies.

If there are reasons to believe that the operational safety can no longer be guaranteed the device
must be taken out of service and labelled accordingly. The safety may be impaired when the device
does not operate properly or if it is obviously damaged.

TABLE OF CONTENTS

CONTENTS Page

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 3

1 General information 5

2 Quick installation 6

3 Hardware 7

3.1 Front panel components 7

3.2 Installation 8

3.2.1 Power supply 8

3.2.2 Connecting the antenna 8

3.2.3 Installation of the configuration software 8

3.3 Technical Data 9

4 Software 11

4.1 System requirements 11

4.2 Installation of the remote software 12

4.2.1 Uninstalling the remote software 12

4.2.2 Start programme 12

4.2.3 Trouble shooting 13

4.3 Functions of the configuration software 14

4.3.1 General 14

4.3.2 Selecting the serial interface 14

4.3.3 Changing the language 14

4.3.4 Information 15

4.3.5 Extras 15

4.3.6 Date & Time 17

4.3.7 Time Zone 18

4.3.8 Changeover time/changeover point 19

4.3.9 Position 20

4.3.10 Satellites 21

4.3.11 System Byte 22

4.3.12 Serial Parameters 24

4.3.13 Mode bytes 25

4.3.14 Optical coupler 27

4.3.15 Outputs 29

4.3.16 DCF77 Simulation 30

4.3.17 IRIG-B / IRIG Time Code 31

4.3.17.1 IRIG Time Code Structure and Timing-Diagram 32

4.3.17.2 Format categories IRIG-Bxxx according to IRIG Standard 200-04 33

4.3.17.3 IRIG IEEE 1344-1995 33

4.3.17.4 AFNOR NFS 87-500 33

4.3.18 Version / Reset 34

5 Data strings 35

5.1 General information on the serial data output of the 6875 board 35

5.2 Set-up of the standard (hopf6021) string 35

5.2.1 Status and day of the week nibble 36

5.2.2 Configuration for NTP (Network Time Protocol) 36

5.3 Data string: Standard (hopf6021) with year 2000 37

5.3.1 Status and day of the week nibble 38

5.4 Data string SINEC H1 39

5.4.1 Status in data string SINEC H1 40

TABLE OF CONTENTS - CONTINUED

CONTENTS Page

Page 4 GPS Satellite Controlled Clock 6875 - Ver. 04.00

5.5 Data string T-String 41

5.6 Data string Master/Slave 42

5.6.1 Status in Data String Master/Slave 43

5.6.2 Setting 43

5.7 GPS2000 Data String 44

5.7.1 Time Accuracy in the GPS2000Data String 44

5.7.2 Configuration for GPS2000 Data String 45

5.8 Data String SAT 1703 Time String 46

5.8.1 Specified Settings 46

5.8.2 Data String Structure 46

5.8.3 Data String Example 47

5.9 SINEC H1 Extended 48

5.9.1 Data String Structure 48

5.9.2 Status 49

5.9.3 Example of a Transmitted Data String 49

6 Examples of connections 50

6.1 Assignment of the screw clips 50

6.1.1 Examples of connections for OC1-3 50

7 Dimensions of Snap-in Module Housing 52

8 Glossary und Abbreviations 52

GENERAL INFORMATION

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 5

1 General information

The 6875 radio-controlled clock is a universal GPS reception module with a highly accurate time
reference developed for controlling industrial processes. The 6875 snap-in module for 35mm
(DIN) track mounting is fitted with three PhotoMOS signal relays, an analogue and digital TTL
output and up to four independent serial interfaces.

The PhotoMOS signal relay outputs can be used, for example, for the SPS or measuring proc­ess control. Following output modes are available:

• DCF77 pulse

• System status (radio-controlled or quartz)

• Status of the power supply on/off

• Cyclical pulses

• Non-cyclical pulses (1 pulse per day at a defined time, 1 pulse per year at a defined

time and on a defined date)

The analogue output can be used to synchronize DCF77 or IRIG-B systems.

The serial interfaces COM0...COM3 are used for the output of different pulses and data strings.
Each interface can be configured with hopf remote software.

The 6875 snap-in module has further features:

• Potential-free antenna circuit

• All outputs potential-free

• All settings can be parametered via the COM0 serial interface

• COM1 interface can be switched from RS232 to RS422 via configuration software

• switchable analogue output IRIG-B / DCF77

The following versions of the system are available (indicated on the identification label):

• FG6875G00 (GPS 6875 snap-in module basic version) with

• 3 PhotoMOS pulse outputs

• serial interface COM0: RS232

• serial interface COM1: RS232/RS422

• simulation output for DCF77 antenna simulation or IRIG-B 12x (x=0..3)

• programming cable, remote software and technical documentation included

• FG6875G01 (6875 snap-in module) with

• GPS 6875 snap-in module basic version FG6875G00

• Serial interface COM2: optical output

• FG6875G02 (6875 snap-in module) with

• GPS 6875 snap-in module basic version FG6875G00

• Serial interface COM2: optical output

• Serial interface COM3: optical output

• FG6875G03 (6875 snap-in module) with

• GPS 6875 snap-in module basic version 6875

• Serial interface COM2: optical output

• Serial interface COM2: optical input

The configuration software on the CD supplied is available for the most common MS Windows,
Linux and Sun Solaris operating systems (for more details see 4.1).

QUICK INSTALLATION

Page 6 GPS Satellite Controlled Clock 6875 - Ver. 04.00

2 Quick installation

Synchronization is accelerated by initialising the GPS 6875 satellite clock when first putting into
operation. It is not absolutely necessary to enter set-up values. However, without initialisation it
may be several hours before the first signals are received.

For quick installation it is necessary to set the following set-up values in the GPS 6875 satellite
controlled clock:

• Earth the device

• Connect the antenna

• Create communication between the PC and the remote-controlled clock

• Connect the power supply

• Install and start the remote software

• Set the current local time

• Ser the local time difference to UTC (local time - UTC)

• Set changeover dates

• Set the position data of the location; if this is not known then set an approximate value

or set everything to zero

• Activate the reset of the clock after the next minute change

• Wait approx. 10 minutes to 4 hours before synchronizing the radio-controlled clock

The individual menu items of the programme are explained on the following pages.

HARDWARE

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 7

3 Hardware

3.1 Front panel components

Connector X1

2 x 4 pole plug-in connectors (female) with codeable profile and threaded

flange (corresponding connector (male) is included)
+Vin Connection for positive potential of the power supply
–Vin Connection for negative potential of the power supply

+OC3, +OC2, +OC1 PhotoMOS signal relay connection for positive voltage potential (Drain)

−OC3, −OC2, −OC1

PhotoMOS signal relay connection for negative voltage potential (Source)

Connector X2

9 pole SUB-D connector

Pin No.: Function

1, 5 GND

4 Digital output, TTL

COM0 RS232

2 Receiving line

(RxD0)

3 Transmission line

(TxD0)

COM1 RS232 RS422

6 Transmission line

TxD1 +TxD1

1

7 Transmission line

-TxD1

2

8 Receiving line

RxD1 -RxD1

2

9 Receiving line

+RxD1

1

1

high active

2

low active

HARDWARE

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LED / Key

Function

CLK green, indicates the synchronization status of the clock
C1-C3 yellow, indicates the switch status of the corresponding PhotoMOS signal

relay

DEF key (DEF)ault key for restoring the standard configuration

BNC connec­tors

IRIG-B /
DCF77-Out

analogue output for the output of the modulated IRIG-B or DCF77 signal
(BNC female connector)

GPS-In input for GPS antenna (BNC connector)

Option

optical interfaces COM2, COM3 (ST connection: bayonet)

FL 1 optical transmitter for serial interface COM2
FL 2 optical transmitter COM3 / optical receiver for serial interface COM2

3.2 Installation

3.2.1 Power supply

The power supply is connected via the 2 x 4-pole connectors, as supplied, with threaded flange,
connections +Vin und -Vin on the connecting unit X1. The system is provided with a voltage of

18...72 VDC..

The internal voltage supply of the 6875 snap-in module is potential-free. It must be earthed on
the rear side of the housing via the screw as labelled, in order to compensate the potential dif­ference between the ground potential of the housing and the earth.

Please Note: ALTHOUGH THERE IS INTERNAL PROTECTION AGAINST WRONG POLING, ATTENTION

MUST BE PAID TO THE CORRECT VOTLAGE AND POLARITY WHEN CONNECTING THE
POWER. ONLY QUALIFIED STAFF SHOULD FIRST PUT THE EQUIPMENT INTO OPERA­TION.

3.2.2 Connecting the antenna

The antenna is connected via the hopf antenna cable to the GPS-In BNC connector (more in­formation in the GPS appendix).

3.2.3 Installation of the configuration software

see 4.2.

HARDWARE

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 9

3.3 Technical Data

General

Snap-in module dimensions of
housing

width: 65 mm, height: 105 mm, depth: 130 mm

max. outer dimensions width: 65 mm, height: 105 mm, depth: 155 mm

Power supply

min. 18 to max. 72 VDC
Output isolation 500V DC
typical / max. performance 3,5 VA / 4 VA
Temperature range 0...+ 50 °C with improved free wheeling characteristics

0...+ 70 °C with restricted free wheeling characteristics

MTBF

> 295.000 hrs.

Accuracy (GPS Model)

PPS pulse (internal) ± 300 nsec
VCO control (internal time
base)

± 0,1 ppm, after approx. ½ hr. continuous GPS recep-

tion

Free wheeling characteristics

± 0,05 ppm, after VCO control at a constant tempera-

ture +10...+50 °C
PPS drift depending on
changes in power supply in free
wheeling status

± 0,0002 ppm/V

PPS drift depending on
changes in temperature in free
wheeling status

± 0,16 ppm/°C, at constant Uin=24V and temperature

radient of approx. 1,5°C/min

Accuracy (quartz model)

Free wheeling characteristics ± 0,5 ppm, after factory setting of VCO control at a con-

stant temperature of +20°C
Drift

max. ±4 ppm/Year

Backup Clock

Accuracy ± 25 ppm from +10°C to +50°C
Backup (maintenance free) min. 3 / typ. 10 / max. 15 days

Optical coupler

max. performance, capacity in
Ohms

60V DC / 200 mA

Switch on/off delay 130 / 70 µsec. at 10 mA switch mode power supply
Output isolation 500V DC

DCF77 pulse

output at COM1,COM2 (FL1),

COM3 (FL2), TTL (X2)
accuracy same as internal PPS pulse
signal level depending on output interface

DCF77 simulation output

output at BNC (IRIG-B / DCF77-Out)
accuracy same as internal PPS pulse
carrier signal frequency 77.5 kHz ± 25 ppm

signal level

3...5 mV

pp

at 50 Ohm

HARDWARE

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Info: The IRIG-B Output is done by the IRIG Standard 200-04!

IRIG Time Code (digital)

output at COM1,COM2 (FL1),

COM3 (FL2), TTL (X2)
accuracy same as internal PPS pulse
signal level depending on output interface
IRIG Time Code Format IRIG-B - B002 / B003 / B006 / B007,

IEEE1344, AFNOR NFS 87-500

IRIG Time Code (analogue)

output at BNC (IRIG-B / DCF77-Out)
accuracy same as internal PPS pulse
carrier signal jitter (1kHz) ± 2 µsec
signal level ca. 2 V

pp

(± 10%) at 50 Ohm

ca. 2 V

pp

(± 10%) at 600 Ohm
modulation ratio 3 : 1
IRIG Time Code Format IRIG-B – B122 / B123 / B126 / B127,

IEEE1344, AFNOR NFS 87-500

Interfaces: COM0, COM1

asynchronous, without handshake
Baud rate 300 - 19.200 Baud
Stop bit 1 / 2 bit
Word length 7 / 8 bit
Parity no, even or odd
Line length The line lengths depend on the type of line and the

setting of the Baud rate.

Option:

optical interface, λ = 820 nm

Interfaces: COM2, COM3

asynchronous, without handshake, optical
Baud rate 300 - 19.200 Baud
Stop bit 1 / 2 bit
Word length 7 / 8 bit
Parity no, even or odd

Optical transmitter:
COM2 (FL 1), COM3 (FL 2)

Optical receiver:
COM2 (FL 1)

Connection: ST series (bayonet)

Wave length

λ = 820 nm
Cable types supported (multi­mode)

50/125 µm, 62.5/125 µm, 100/140 µm or

200 µm HCS ® fibre

GPS receiver

8 canal, C/A Code, code plus carrier tracking
Log-in sensitivity -134 dBm
Log-out sensitivity -143 dBm
Frequency range L1 = 1575,42 MHz

Recording time

Warm start < 1 min. (backup max. 3 days)
Cold start 30 min. - 4 hrs.

(1

st

installation without definition of position)
Accuracy ± 300 nsec
Temperature range 0...+ 60 °C

Additional components: see GPS accessories

Please Note: SUBJECT TO ERRORS AND TECHNICAL MODIFICATIONS

SOFTWARE

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 11

4 Software

4.1 System requirements

The hopf 6875 configuration software is for configuration of a hopf 6875 radio-controlled clock
via a serial interface. The serial interface cable included is connected between the computer (at
the free serial interface) and the radio-controlled clock (COM0).

Depending on the platform the following system requirements are necessary for the remote soft­ware and/or the installation programme:

Windows

• Windows 95, 98, ME, NT, 2000, XP

• min. 32 MB RAM (128 MB recommended)

• min. 40 MB free hard disk memory

• screen resolution min. 640x480 (1024x768 recommended)

Linux

• RedHat 7.1, SuSE 7.2 or Debian 2.2R3

• glibc 2.x

• libstdc++-libc6.1-1.so.2

• X-Windows

• min. 32 MB RAM (128 MB recommended)

• min. 110 MB free hard disk memory

• screen resolution min. 640x480 (1024x768 recommended)

Solaris SPARC

• Solaris 8

• X-Windows

• min. 32 MB RAM (128 MB recommended)

• min. 75 MB free hard disk memory

• screen resolution min. 640x480 (1024x768 recommended)

Solaris x86

• Solaris (x86) 8

• X-Windows

• min. 32 MB RAM (128 MB recommended)

• min. 75 MB free hard disk memory

• screen resolution min. 640x480 (1024x768 recommended)

Please Note: FOR PROBLEM-FREE EXECUTION THE INSTALLER AND/OR THE CONFIGURATION

SOFTWARE REQUIRE ADMINISTRATOR OR ROOT RIGHTS FOR THE CORRE­SPONDING INTERFACE DEVICE.

SOFTWARE

Page 12 GPS Satellite Controlled Clock 6875 - Ver. 04.00

4.2 Installation of the remote software

To install the remote software the installation programme/script must be started. This requires a
graphic user interface:

Windows

6875_v01_03_Win32_install.exe

Linux

6875_v01_03_Linux_install.bin

Solaris SPARC

6875_v01_03_Solaris_SPARC_install.bin

Solaris x86

6875_v01_03_Solaris_x86_install.bin

Follow the instructions in the installation programme to complete the installation.

4.2.1 Uninstalling the remote software

Windows

The application can be uninstalled via system control:

• Start menu Ö Set-up Ö System control Ö Select software

• Select remote software and click add/remove Ö Uninstall-programme starts

• Follow the instructions in the uninstall-programme

Unix Platforms

The application can be removed via the uninstall-programme supplied (Uninstall6875) which is
found in the corresponding subdirectory UninstallerData
(e.g. /opt/Hopf/6875/UninstallerData/Uninstall6875).

4.2.2 Start programme

Windows

After installation has been completed in the chosen directory (e.g. C:\rogramme\Hopf\6875) the
configuration software can be started by selecting the appropriate link (e.g. Start Ö Programme
Ö Hopf Ö Hopf 6875).

Unix Platforms

After completing installation into the chosen directory (e.g. /opt/Hopf/6875) the configuration
software can be started via Startscript (Hopf6875) which can be found in the bin-directory (e.g.
/opt/Hopf/6875/bin/Hopf6875).

Please Note: SINCE THE VALUES SHOWN ARE CONSTANTLY UPDATED, DELAYED REACTION

TIMES IN THE INPUT FIELDS WITH MOUSE OR KEYBOARD ENTRIES ARE POSSIBLE
WITH LESS POWERFUL SYSTEMS.

SOFTWARE

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 13

4.2.3 Trouble shooting

• If there is an initialisation error when the configuration software is started then the serial
interface is either incorrectly configured or is being used by another programme.

• If a communication error arises during the execution of the configuration software, then
the radio- controlled clock is incorrectly connected or another instrument is connected to
the interface selected.

• If another programme is using the same serial interface as the configuration software
(e.g. an NTP service), then this must be ended to ensure that the configuration software
functions correctly.

• If the monitor resolution is low or some fonts are missing there may be slight distortion
in the script of the configuration software. This does not however affect the functions.

• If during installation a JAVA VM version is selected which is already installed, then care
must be taken that the minimum version is Java2 1.3. Usually we advise using or install­ing JAVA-Runtime as supplied.

• Information about possible errors specific to operating systems can be found in the cor­responding readme-file as supplied.

If there are any questions or installation problems please contact the support team at Ruprecht
& Partner OEG under the e-mail address: [email protected]

Updated versions can be found on the website of Ruprecht & Partner OEG: http://www.rdcs.at/

SOFTWARE

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4.3 Functions of the configuration software

4.3.1 General

The hopf 6875 configuration software is for convenient configuration of a hopf radio-controlled
clock 6875 via an RS232 interface. All the parameters of the radio-controlled clock can be dis­played or set via a graphic user interface. These are divided into categories (e.g. time zone,
changeover time, serial parameters, etc.). Each of these categories is illustrated on a tab in the
upper section of the window.

A click of the mouse activates a tab – the window with the corresponding details is switched up.
This is divided into two areas: the current values and the values to be set. When a tab is se­lected, the current values of the radio-controlled clock are requested and displayed. In this case
the values to be set correspond to the current values and can be changed by clicking the corre­sponding arrow fields or by manual input.

Activating the button "SEND" transmits the values to be set to the radio-controlled clock. If an
error occurs a message is emitted, otherwise the current values are updated.

The software can be ended by activating the button "END".

4.3.2 Selecting the serial interface

The serial interface to which the radio-controlled clock is connected can only be selected when
the programme is started.

Depending on the PC or operating system it may take some time to set up the selection window.

After selecting the appropriate interface the hopf 6875 configuration software will try to connect
to the radio-controlled clock. If no connection can be made a corresponding message will ap­pear. In this case please check that the cable is correct and/or that the cable is connected to the
correct interfaces.

A new attempt to make a connection on the same interface can be made by selecting any other
tab. If this is to be tried on another interface then the programme must be ended and re-started.

4.3.3 Changing the language

The language used in the software can be changed during operation by selecting the desired
language in the selection menu on the left hand side of the window. This takes effect immedi­ately after closing the selection window (perhaps with a slight delay, depending on the type of
PC).

SOFTWARE

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 15

4.3.4 Information

In this section information about the software or contacts can be found in the info dialogue
which is activated by clicking on the info button (on the right next to the button “help”).

4.3.5 Extras

This section makes it possible to save a complete configuration of a radio-controlled clock in a
configuration file (text file) or to load down from a configuration file and transmit to the radio­controlled clock.

SOFTWARE

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SAVE (IN A FILE)

Selecting the button "SAVE" opens a dialogue which enables selection of a target directory or
indication of a file name. After the target directory or a file name has been defined the current
configuration of the radio-controlled clock can be saved by selecting the button “SAVE“. As soon
as “SAVE” has finished, a confirmation dialogue appears which reports either success or error.

LAODING (FROM A FILE)

If a configuration is to be loaded which is already available or has already been saved then the
button “LOAD” should be clicked. A dialogue appears in which the file to be loaded is selected.
After selecting the file and confirming this with the button “OPEN” the following dialogue ap­pears:

[LOAD DIALOGUE]

This dialogue shows in a well-structured form all the configuration data in the file which has
been loaded. The left column contains the definition of the value, the middle column the actual
value and the right column the status. If the status is “OK” (green), then this value is available –
if not, then the status of this value is “ERROR” (red). If at least one value has the status “ER­ROR”, the configuration cannot be transmitted to the radio-controlled clock. Otherwise the con­figuration shown can be transmitted to the radio-controlled clock by activating the button
“SEND”. This procedure can take some time and is confirmed after completion with a success
or error message. The dialogue can be ended by selecting the button “CLOSE”:

The button "HELP" is for activating online help – this contains all the information contained in
this document and additional general information about GPS.

SOFTWARE

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 17

4.3.6 Date & Time

This section makes it possible to display and/or change values relating to date and time.

The following values are displayed or can be configured:

Day of the week, date, time:

Setting the day of the week, the date and the time is only necessary when commissioning the
radio-controlled clock. In this case the configuration software checks the plausibility of the time
and date values entered. Before transmission of the time to the radio-controlled clock the cor­rect day of the week for the date entered is checked – if the day of the week entered differs from
that which is calculated then a corresponding message will appear.

Time difference:

Shows the actual time difference between local time and UTC in hours and minutes.

In this section the value is for information purposes only and can only be changed in the section
“Time Zone“ (4.3.7).

Status Timeout:

Shows the time delay in minutes until the resetting of the radio-controlled bit in the time status.
This value can be between 2 and 255 minutes.

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Status:

Is made up of: synchronization status (e.g. quartz mode, radio-controlled mode, etc.) and actual
time status (e.g. daylight saving, standard time, announcement of changeover etc.). It is for in-

formation purposes only and cannot be changed.

Synchronization status of the radio-controlled clock:

• invalid time of day

• quartz mode

• radio-controlled mode (without quartz frequency control)

• radio-controlled mode (with high accuracy / with quartz frequency control)

Time status for local time of day:

• standard time

• daylight saving time

• announcement of changeover

• announcement of leap second

4.3.7 Time Zone

In this section the time zone for the location of the radio-controlled clock can be displayed and
adjusted. Setting the time difference is only necessary when commissioning.

The time difference (country- or location- specific time offset to UTC, difference between local
time and UTC) is made up of the following information:

Hour, minute and the information as to whether the location is west or east of the 0 meridian
(Greenwich).

The configuration software checks the plausibility of the values entered.

Example: West (-) 08:00 USA and Canada (Pacific Time)

East (+) 01:00 Germany

SOFTWARE

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 19

4.3.8 Changeover time/changeover point

In this section the daylight saving/standard and standard/daylight saving changeover times can
be displayed and changed.

In order to set the changeover times the changeover function must first be activated. If no
changeover is required this must be deactivated Ö time of day (local time) then runs in stan­dard time status.

To set the changeover times the following information is required:

• first, second, third, fourth or last day of the week in the month

• day of the week

• month

• time in hours and minutes

SOFTWARE

Page 20 GPS Satellite Controlled Clock 6875 - Ver. 04.00

4.3.9 Position

This section enables the display and setting of the geographical position of the radio-controlled
clock.

Setting the approximate location position (if known) shortens the time required for first initialisa­tion of the GPS receiver in the radio-controlled clock.

The entries of latitude and longitude are in degrees, minutes, 1/100 und 1/10000 minutes and
the following additional information concerning the geographical location:

Entry for latitude:

North = northern hemisphere
South = southern hemisphere Example: North 51°12,3651

Entry for longitude:

East = east of Greenwich meridian
West = west of Greenwich meridian Example: East 007°37,8426

For accelerated synchronization the GPS radio-controlled clock requires only the entry of the
approximate location. For the exact position shown in the above example the following entry
would suffice:

North 50°00,0000
East 007°00,0000

SOFTWARE

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 21

4.3.10 Satellites

This function enables display of the current satellite receiver quality as well as the configuration
of the GPS reception mode. The following values (updated periodically) are shown:

• number of satellites visible at the given time

• reception quality as S/N Ratio (signal to noise ratio ) for individual satellites

• evaluation mode for GPS satellite reception

The GPS reception mode can be set to 3D or Position fixed.

The accuracy of the time is determined by the accuracy of the calculation of the position of im­plementation of the clock. For this calculation reception from at least 4 satellites is necessary
(GPS reception mode 3D).

In the GPS reception mode Position fixed the accuracy depends considerably on the exact en­try of the location of implementation. When entering the position up to ± 1 minute, the accuracy
of the second mark is already better than ± 20 µsec.

Position fixed has the advantage that the GPS radio-controlled clock can be synchronized with
one satellite only. The antenna can also be installed in locations where less than a quarter of
the sky is visible. In many cases it is possible to mount the antenna indoors near the window
(short cable lengths, no lightning protection).

If, in this mode, 4 satellites are available the evaluation jumps automatically to GPS reception
mode 3D and calculates the exact position.

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4.3.11 System Byte

This section permits the configuration of additional internal system functions. These are acti­vated and deactivated by the setting and resetting of a bit.

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GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 23

Each bit has two possible statuses: IN (1) and OUT (0).

Default system byte configuration: Bit No.: 0 ... 7 = OUT (0).

Bit No.: IN (1) OUT (0)

7

unassigned unassigned

6

Permanent simulation of the time status
"radio synchronous ..." even without
valid GPS reception

Time status "radio synchronous ..."
only set in case of valid GPS reception

5

direct synchronisation of the second
and the millisecond with the exact GPS
second mark (*)

direct synchronisation of the second
and the millisecond with the exact GPS
second mark only after 2 hours (*)

4

unassigned unassigned

3

unassigned unassigned

2

unassigned unassigned

1

unassigned unassigned

0

unassigned unassigned

(*) Explanation referring to the function in system byte Bit-No.: 5:

• Bit-No.: 5 = OUT (0):

- Crystal operation < 2 hours Ö

The internal second and millisecond mark are slowly adjusted to the GPS sec­ond mark after the GPS resynchronisation (without leap).

- Crystal operation > 2 hours Ö

The internal second and millisecond mark are directly set to the GPS second
mark after the GPS resynchronisation (leap of the internal second mark).

• Bit-No.: 5 = IN (1):

- Crystal operation Ö

The internal second and millisecond mark are directly set to the GPS second
mark after the GPS resynchronisation (leap of the internal second mark).

- When "Output in crystal operation is locked" is activated, the signal output
of "IMP 1" and "IMP 2" (see chapter optical coupler) will be carried out at the
time status "radio synchronous with crystal regulation". Depending on the
accuracy demands for the application, the pulse output of the drifting pulses
(based on the fluctuant environmental conditions, like e.g. temperature) will be
locked or rather disconnected, if the GPS synchronisation fails.

SOFTWARE

Page 24 GPS Satellite Controlled Clock 6875 - Ver. 04.00

4.3.12 Serial Parameters

This section permits display and modification of the transmission parameters of the serial inter­faces of the radio-controlled clock.

The selection of the interface to be configured is made in the upper part of the frame by clicking
the appropriate interface [COM0, COM1, COM2 (FL1/FL2) und COM3 (FL2)]. The current val­ues for the selected interface are requested and displayed. These values can be changed by
selecting from the lists intended for this purpose.

The following serial parameters may be set:

Baud rate

input of the Baud rate: between 150, 300, 600, 1200, 2400, 4800, 9600 and
19200 Baud

Data bits

input of the word length: 8 or 7 Bit

Stoppbits

number of stop bits: 1 or 2

Parität

parity input: no, odd, even

If the serial interface COM0 of the clock has already been (previously) configured with different
parameters (status ex works <9600 baud, 8 data bits, 1 stop bit, no parity>), then the configura­tion data must be adjusted accordingly so that communication is possible between the configu­ration software and the clock. The transmission parameters for the serial interface via which the
configuration software is configured are stored in the configuration file <settings.conf>. This is
found in the installation directory (Windows platforms) or in the directory <Installation direc­tory>/etc/ (UNIX-Platforms).

Please Note: BY ACTIVATING THE DEF KEY (PRESSS FOR AT LEAST 10 SECONDS) ON THE

FRONT PANEL OF THE CLOCK THE SERIAL PARAMETERS OF THE CLOCK ARE SET TO

<9600 BAUD, 8 DATA BITS, 1 STOP BIT, NO PARITY>.

SOFTWARE

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 25

In order to set the transmission parameters for the serial interface in <settings.conf> to the fol­lowing values <9600 Baud, 8 data bits, 1 stop bit, no parity> the following entries are required:

baudrate=9600

databits=8

stopbits=1

parity=N

4.3.13 Mode bytes

In this section the output strings of the serial interfaces are displayed and changed.

The serial interface to be configured is selected in 4.3.12.

There is a detailed description of the individual data strings in section 5.

The interface(s) designated for the output of the data strings as set must be indicated addition­ally in section 4.3.15.

Please Note: THE ENTRIES “C01 CUSTOM STRING” TO “C16 CUSTOM STRING“ IN THE SELEC-

TION “TRANSMISSION STRING“ ARE RESERVED FOR SPECIAL SOLUTIONS AND NOR­MALLY HAVE NO FUNCTION.

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Page 26 GPS Satellite Controlled Clock 6875 - Ver. 04.00

The following settings are possible:

Transmission
string

Type of data string to be emitted:

Standard 6021,

Standard 6021 with year 2000,

Master/Slave,

Siemens Sinec H1,

T-String,

GPS2000,

SAT 1703 Time String,

SINEC H1 Ext.

Control character

Output of ETX control character in the data string:

Standard (direct, no delay),

At the second change (no delay) or

At the second change (with delay)

Time basis

Time basis for the data string: Local time, UTC

Transmission
time

Output of the data string at the second change:

Each second

Each minute

Each hour

On request

Second forerun

Output of the data string with 1 second forerun: no, yes

CR / LF

Sequence for CR and LF: CR->LF, LF->CR

SOFTWARE

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 27

4.3.14 Optical coupler

This section enables the configuration of 3 PhotoMOS signal relay outputs and 2 additional
pulses. The selection of the signal relay outputs to be configured ("OK 1", "OK 2" and "OK 3")
and the pulses ("IMP 1" und "IMP 2") is made by clicking on the upper part of the frame.

The current values for the selected output or pulse are requested and displayed. Depending on
the "Modus" which has been set additional methods of configuration will appear or fade. The
following modes are supported:

DCF77 (Mode 0)

In this setting the DCF77 pulse will be emitted at the appropriate output. This setting is used, for
example, for the synchronization of further DCF77radio-controlled clocks with DCF77 pulse in-

put such as hopf 6850. If desired this signal can be inverted. The settings for the DCF77 pulse
are in the DCF77 menu and apply to all outputs emitting this.

Sync. Information (Mode 1)

In this setting the internal clock radio-control status is emitted at the corresponding output. If the
PhotoMOs signal relay is switched through then the clock is in radio-controlled status. The laps­ing of the signals indicates quartz mode. The signal output can not be inverted.

System Information (Mode 2)

In this mode the corresponding output is switched through when the power supply is set. If there
is interference the signal lapses and hereby emits an alarm. The signal output cannot be in­verted.

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Page 28 GPS Satellite Controlled Clock 6875 - Ver. 04.00

Cyclical output: within 24 hours (Mode 3)

In this mode cyclical pulses with an adjustable pulse width can be created on the corresponding
output. The following pulse intervals are possible:

every 1, 2, 3, 4, 6, 8, 12 hours
every 1, 2, 3, 4, 5, 6 , 10, 12, 15, 20, 30 minutes
every 1, 2, 3, 4, 5, 6 , 10, 12, 15, 20, 30 seconds

The output time of the pulse is fixed by clicking with the mouse on the appropriate arrow filed in
the input fields designated for this. A combination of hours, minutes and seconds is not allowed
and is prevented by the software.

The pulse length can be selected in the range of 10- 2550 msec in 10 msec steps. The Pulse
length should not exceed the cycle time, because then the output remains constantly switched
through.

It is possible to invert the signal output.

Daily pulse (Mode 4)

This mode creates a single pulse per day at the time entered at the output. The output time of
the pulse is fixed by clicking on the corresponding fields or by manual entry in the input fields
designated for this purpose.

The entries for day, month and year are deactivated.

The pulse length can be selected in the range of 10- 2550 msec in 10 msec steps.

It is possible to invert the signal output.

Single pulse (Mode 5)

This mode creates a single pulse per time and date at the output.

This mode creates a single pulse at a defined point in time. The output time of the pulse is fixed
by means of a mouse click on the corresponding arrow fields or by manual entry in the fields
designated for this.

The pulse length can be selected in the range of 10- 2550 msec in 10 msec steps. It is possi-
ble to invert the signal output.

In the settings Mode 2 and 3 it is of no benefit to invert the output, since, in the case of power
failure, false information would be passed on to the outputs. In the following paragraphs there is
an exact description of the individual modes.

By activating the checkbox "Disable output in quartz mode" it is possible, in the modes 4 and
3, to bind the pulses to the radio-controlled status, specially for IMP 1 and IMP 2. That means
that there is only a pulse output when the clock is in radio-controlled mode.

By deactivating the checkbox "Disable output in quartz mode" pulses are emitted in quartz
mode.

Configuration for an inverted output of the pulses IMP 1 and IMP 2 takes place in the section
“Outputs“ in 4.3.15.

The settings for the individual PhotoMos signal relays are each transmitted individually to the
radio-controlled clock.

SOFTWARE

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 29

4.3.15 Outputs

This section permits the shunting of output signals to the outputs of the radio-controlled clock.

All the settings are made via selection lists.

Only the output of serial data strings is possible via the serial interface COM0. This is used
mainly for the configuration of the equipment or as a synchronization source.

The outputs: COM0, COM1, COM2 (FL1 / FL2) and COM3 (FL2) are serial interfaces, the out­put BNC refers to the analogue output IRIG-B / DCF77-Out and TTL describes the digital TTL
output on the connector X2.

Methods of configuring COM1 (serial interface COM1 in the radio-controlled clock):

• Output signal: data string, IMP1 (pulse1), IMP2 (pulse2), IRIG-B pulse

• Interface: RS232, RS422 full-duplex

• The output signals can also be emitted inversely

Methods of configuring COM2 and COM3 (optical serial interfaces):

• Output signal: data string, IMP1 (pulse1), IMP2 (pulse2), IRIG-B pulse

• The output signals can also be emitted inversely

Methods of configuring BNC:

• Output signal: DCF77 simulation or IRIG-B signal generation

Methods of configuring TTL (digital TTL output in the radio-controlled clock):

• Output signal: data string, IMP1 (pulse1), IMP2 (pulse2), IRIG-B pulse

• The output signals can also be emitted inversely.

Please Note: THE CONFIGURATION OF IMP1 (PULSE1) AND IMP2 (PULSE2) IS IN THE “OPTICAL

COUPLER“ MENU.

SOFTWARE

Page 30 GPS Satellite Controlled Clock 6875 - Ver. 04.00

4.3.16 DCF77 Simulation

In this section settings can be made for the DCF77 simulation and the DCF77 pulse. These are
global settings and are valid for all outputs which emit a DCF77 simulation or DCF77 pulse.

The outputs at which a DCF77 pulse is emitted can be indicated in 4.3.15.

The following entries are required for configuration:

• Pulse length Highbit in the range 140...240 msec (Standard: 200 msec)

• Pulse length Lowbit in the range 70...130 msec (Standard: 100 msec)

• Delay for DCF77 switch-off in the range 2...255 minutes (at 255 Ö

∞)

• Time basis: local time or UTC

The pulse lengths and the switch-off delays are determined by mouse click on the correspond­ing input fields or by manual entry, the time basis is entered via the selection list.

The value "DCF77 timeout after" indicates the delay time in minutes for the output of the
DCF77 simulation or the DCF77 pulse when changing to quartz mode. If this value is set at 255
the DCF77 simulation and/or DCF77 pulse will be emitted permanently.

SOFTWARE

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 31

4.3.17 IRIG-B / IRIG Time Code

In this section the settings for the IRIG Time Code signal generation (analogue) are made.

These are global settings and are valid for the output of the analogous amplitude modulated
signal (e.g. IRIG-B B12x) as well as for the digital pulse width modulated signal (e.g. IRIG-B
B00x).

The 'analogue' IRIG Time Code is given out at the BNC-connector (IRIG-B). The outputs for
IRIG Time Code (digital) can be configured as described in chapter 4.3.15.

IRIG Time Code Formats

The following formats of IRIG Time Code are available:

o IRIG-B - B002/B122 (time)

o IRIG-B - B003/B123 (time, seconds of day)

o IRIG-B - B006/B126 (time, year)

o IRIG-B - B007/B127 (time, year, seconds of day)

o IEEE1344

o AFNOR NFS 87-500

Info: The IRIG-B output is done by the IRIG Standard 200-04.

Time Base for IRIG Time Code

For special applications the time basis transmitted in the IRIG Time Code can be configured.

o Local Time

o UTC Time

Timeout for delayed Output Break

This value acts as bypass for the reception failure for the output break of the IRIG Time Code
referring to delicate reception conditions.

With regard to a reception failure of the sync. source (here GPS) the turning off of the IRIG-B
signal is delayed by the adjusted figure.

The value can be set between 002 and 255 minutes.

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Page 32 GPS Satellite Controlled Clock 6875 - Ver. 04.00

4.3.17.1 IRIG Time Code Structure and Timing-Diagram

The IRIG format consists of one time code with 74 bits and has a repeatability rate of one sec­ond. The bit frame is 10 msec. The rating of a bit is displayed by a pulse width modulation and
is shown in multiples of a millisecond.

With analogue output the positive zero cycle of a sinus oscillation (carrier frequency 1000Hz) is
modulated with the rising edge of the IRIG signal. The rate of modulation for the signal informa­tion of H/L level should be between 3:1 and 6:1. The Din-Rail Module 6870 distributes a modu­lation of 3:1.

To synchronize to the beginning of a second a neutral logic status is required which is called the
identifier.

Logic 0 = 2 msec H-level
Logic 1 = 5 msec H-level
Identifier = 8 msec H-level

low

high

PPS

IRIG-B

digital

IRIG-B
analog

2msec

5msec

reference bit

position identifier

8ms 8ms

The 74 time code bits are divided into

30 bits for the BCD value of seconds, minutes, hours and the current day of year
27 bits for the input of control information
17 bits for the binary value of the current seconds of day

100 bit frames can be transmitted in one second. Unused bit frames are filled with a logical
zero.

SOFTWARE

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 33

4.3.17.2

Format categories IRIG-Bxxx according to IRIG Standard 200-04

Signal output can be digital or analogue and also with different data content. The variations are
indicated by attaching a three-digit combination of figures.

The figures have the following meaning:

Figure 1

0 = digital output

1 = analogue output via carrier

Figure 2

0 = no carrier

1 = carrier 100 Hz

2 = carrier 1000 Hz

Figure 3

0 = time, second of day, control information

1 = time, control information

2 = time

3 = time, second of day

4 = time, year, second of day, control information

5 = time, year, control information

6 = time, year

7 = time, year, second of day

e.g. IRIG-B123 = analogue output, carrier 1000 Hz,

= data content time information and binary seconds of day

4.3.17.3 IRIG IEEE 1344-1995

This IRIG standard is based on IRIG Standard 200-89. Fixed data such as year, time offset etc.
are assigned to the 27 bits of the control information field.

The IRIG Standard 200-89 is contained as subset in the IEEE1344.

4.3.17.4

AFNOR NFS 87-500

The AFNOR NFS 87-500 Code is similar to the IRIG Time Code Standard. It has been laid
down by the French institute for standards and is based on the IRIG Standard 200-4.

The IRIG-B Standard 200-89 is contained as subset in the AFNOR NFS 87-500.

SOFTWARE

Page 34 GPS Satellite Controlled Clock 6875 - Ver. 04.00

4.3.18 Version / Reset

Firmware information is shown in this section.

Reset clock

A restart of the clock is initiated by this function. The function does not change any of the set­tings made previously, in contrast to the DEF key in the front panel. A reset is necessary after
inputs are completed in order to accelerate the first synchronization.

Please Note: WHEN CHANGES HAVE BEEN MADE ON THE RADIO-CONTROLLED CLOCK IT IS AD-

VISABLE TO WAIT FOR THE MINUTE CHANGE BEFORE SETTING UP RESET.

DATA STRINGS

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 35

5 Data strings

5.1 General information on the serial data output of the 6875 board

When setting ETX to the second change a transmission gap occurs, depending on the Baud
rate, of up to 970 msec. Please pay attention to this when programming timeout on the receiv­ing side.

On all data strings the output of control character CR and LF can be exchanged with mode-

byte.

The transmitted data string are compatible with the data strings of the following hopf clocks:

• Board 6020/6021 standard with control character

• Board 7200/7201 standard with control character

• Board 7220/7221 standard with control character

• Board 7240/7245 standard with control character

• Board 6840/6841 standard with control character

• System 4465 standard with control character

• System 6870 standard with control character

5.2 Set-up of the standard (hopf6021) string

character no.: Meaning Hex

1 STX (Start of Text) $02
2 status (internal status of the clock) $30-39, $41-46
3 day of the week (1=Monday ... 7=Sunday) $31-37

bit 3 in the day of the week is set to 1 with UTC

4 tens hours $30-32
5 unit hours $30-39
6 tens minutes $30-35
7 unit minutes $30-39
8 tens seconds $30-36

9 unit seconds $30-39
10 tens days $30-33
11 unit days $30-39
12 tens months $30-31
13 unit months $30-39
14 tens years $30-39
15 unit years $30-39
16 LF (Line Feed) $0A
17 CR (Carriage Return) $0D
18 ETX (End of Text) $03

DATA STRINGS

Page 36 GPS Satellite Controlled Clock 6875 - Ver. 04.00

5.2.1 Status and day of the week nibble

The second and third ASCII character in the string contain the status and the day of the week.
The evaluation of the status is binary. Set-up of the characters:

b3 b2 b1 b0

Meaning

Status nibble:

x x x 0 No announcement hour
x x x 1 Announcement (DST-ST-DST)
x x 0 x Standard time (ST)
x x 1 x Daylight saving time (DST)
0 0 x x Time/date invalid
0 1 x x Quartz mode
1 0 x x Radio-controlled mode
1 1 x x Radio-controlled mode (high accuracy)

Day of the week nibble:

0 x x x CEDST/CET
1 x x x UTC time
x 0 0 1 Monday
x 0 1 0 Tuesday
x 0 1 1 Wednesday
x 1 0 0 Thursday
x 1 0 1 Friday
x 1 1 0 Saturday
x 1 1 1 Sunday

Example: (STX)E3123456170496(LF)(CR)(ETX)

Radio-controlled mode (high accuracy)), daylight saving time, no announcement
It is Wednesday 17.04.96 - 12:34:56 hrs.
( ) – ASCII control characters e.g. (STX)

5.2.2 Configuration for NTP (Network Time Protocol)

NTP or also xNTP is a programme package for synchronizing different computer and operating
systems with network support. It is the standard for Internet protocol TCP/IP (RFC-1305).
Source code and documentation are available as freeware in the Internet under the following
address: http://www.ntp.org

or http://www.eecis.udel.edu/~ntp/

NTP supports the hopf protocol as described in section 5.2. The following settings are required
in the clock board:

Transmission parameters: 9600 Baud, 8 data bits, no parity, 1 stop bit

Transmission mode: Standard 6021 (hopf6021, time and date), outputevery sec-

ond, time basis: UTC, with second forerun, with ETX at the
second change with control characters (STX...ETX), LF->CR

There are already pre-configured NTP packages for hopf radio-controlled clocks with serial in­terface. On the homepage of Ruprecht&Partner (OEG) (http://www.rdcs.at/

) these are available

for downloading for the following operating systems:

• RedHat Linux 7.1, SuSE Linux 7.2

• Solaris 8 (SPARC)

DATA STRINGS

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 37

5.3 Data string: Standard (hopf6021) with year 2000

The structure of the data string is identical to the standard string. It differs only in the 4-digit
transmission of the year.

Current char. no..: Meaning

1 STX (Start of Text)
2 status (internal status of clock)
3 day of the week (1=Monday ... 7=Sunday)
bit 3 in the day of the week is set to 1 with UTC time
4 tens hours
5 unit hours
6 tens minutes
7 unit minutes
8 tens seconds
9 unit seconds
10 tens days
11 unit days
12 tens months
13 unit months
14 tens centuries
15 unit centuries
16 tens years
17 unit years
18 LF (Line Feed)
19 CR (Carriage Return)
20 ETX (End of Text)

DATA STRINGS

Page 38 GPS Satellite Controlled Clock 6875 - Ver. 04.00

5.3.1 Status and day of the week nibble

The second and third ASCII characters in the string contain the status and the day of the week.
The evaluation of the status is binary. Set-up of the characters:

b3 b2 b1 b0

Meaning

Status nibble:

x x x 0 No announcement hour
x x x 1 Announcement (DST-ST-DST)
x x 0 x Standard time (ST)
x x 1 x Daylight saving time (DST)
0 0 x x Time/date invalid
0 1 x x Quartz mode
1 0 x x Radio-controlled mode
1 1 x x Radio-controlled mode (high accuracy)

Day of the week nibble:

0 x x x CEDST/CET

1 x x x UTC time
x 0 0 1 Monday
x 0 1 0 Tuesday
x 0 1 1 Wednesday
x 1 0 0 Thursday
x 1 0 1 Friday
x 1 1 0 Saturday
x 1 1 1 Sunday

Example: (STX)E312345603011996(LF)(CR)(ETX)

Radio-controlled mode (high accuracy), daylight saving time, no announcement
It is Wednesday 03.01.1996 - 12:34:56 hrs.
( ) – ASCII control characters e.g. (STX)

DATA STRINGS

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 39

5.4 Data string SINEC H1

The control characters STX and ETX are only transmitted when the output is set "with control
characters". Other wise these control characters do not apply. With the setting "ETX delayed"
the last character (ETX) is transmitted at exactly the next second change.

The data string can be accessed with "?" and "T".

Current char. no.: Meaning Value (value range)

1 STX (start of text) $02
2 "D" ASCII D $44
3 ":" colon $3A
4 tens days $30-33
5 unit days $30-39
6 "." point $2E
7 tens months $30-31
8 unit months $30-39
9 "." point $2E
10 tens years $30-39
11 unit years $30-39
12 ";" semi-colon $3B
13 "T" ASCII T $54
14 ":" colon $3A
15 day of the week $31-37
16 ";" semi-colon $3B
17 "U" ASCII U $55
18 ":" colon $3A
19 tens hours $30-32
20 unit hours $30-39
21 "." point $2E
22 tens minutes $30-35
23 unit minutes $30-39
24 "." point $2E
25 tens seconds $30-36
26 unit seconds $30-39
27 ";" semi-colon $3B
28 "#" or space $23 / $20
29 "*" or space $2A / $20
30 "S" or space $53 / $20
31 "!" or space $21 / $20
32 ETX (end of text) $03

DATA STRINGS

Page 40 GPS Satellite Controlled Clock 6875 - Ver. 04.00

5.4.1 Status in data string SINEC H1

The characters 28-31 in the data string SINEC H1 provide information about the synchroniza­tion status of the clock.

The meanings are as follows::

Character no.: 28 = "#" no radio-controlled synchronization after reset, time invalid
space radio-controlled synchronization after reset, hrs and min in

quartz mode

Character no.: 29 = "*" time from the internal quartz crystal of the clock
space time via radio-controlled reception

Character no.: 30 = “S” "DST" daylight saving time
space "ST" standard time

Character no.: 31 ="!" announcing a changeover from ST/DST or DST/ST
space no announcement

Example: (STX)D:03.01.96;T:1;U:12.34.56; _ _ _ _ (ETX) ( _ ) = Space

Radio-controlled mode, no announcement, standard time
It is Wednesday 03.01.96 - 12:34:56 hrs.

DATA STRINGS

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 41

5.5 Data string T-String

The T-string can be transmitted with all modes (e.g. with forerun or final character at the second
change).

The data string can be accessed with "T".

Current char. no.: Meaning Value (value range)

1 "T" ASCII T $54
2 ":" colon $3A
3 tens years $30-39
4 unit years $30-39
5 ":" colon $3A
6 tens months $30-31
7 unit months $30-39
8 ":" colon $3A
9 tens days $30-33
10 unit days $30-39
11 ":" colon $3A
12 tens days of the week $30
13 unit days of the week $31-37
14 ":" colon $3A
15 tens hours $30-32
16 unit hours $30-39
17 ":" colon $3A
18 tens minutes $30-35
19 unit minutes $30-39
20 ":" colon $3A
21 tens seconds $30-36
22 unit seconds $30-39
23 CR (carriage return) $0D
24 LF (line feed) $0A

Example: T:96:01:03:03:12:34:56(CR)(LF)

It is Wednesday 03.01.96 - 12:34:56 hrs.

DATA STRINGS

Page 42 GPS Satellite Controlled Clock 6875 - Ver. 04.00

5.6 Data string Master/Slave

With master/slave data strings slave systems can be synchronized to an accuracy of ± 0,5 msec
with the time data of the master system. In the data sting the time difference to UTC is also
transmitted.

After the year the time difference in hours and minutes is transmitted. The transmission is in
BCD. The time difference may be up to ± 11.59 hrs.

The operational sign appears as the highest bit in the hours.

Logic "1" = local time before UTC
Logic "0" = local time after UTC

Example :

90.00 time difference + 10.00 hrs.

01.30 time difference – 01.30 hrs.

81.30 time difference + 01.30 hrs.

The whole data string has the following structure:

Current char. no.: Meaning Value (value range)

1 STX (start of text) $02
2 status $30-39, $41-46
3 day of week $31-37
4 tens hours $30-32
5 unit hours $30-39
6 tens minutes $30-35
7 unit minutes $30-39
8 tens seconds $30-36
9 unit seconds $30-39
10 tens days $30-33
11 unit days $30-39
12 tens months $30-31
13 unit months $30-39
14 tens years $30-39
15 unit years $30-39
16 time diff.10 + symbol $30,$31,$38,$39
17 time diff. Unit hrs. $30-39
18 time diff. 10 minutes $30-35
19 time diff. Unit minutes $30-39
20 LF (line feed) $0A
21 CR (carriage return) $0D
22 ETX (end of text) $03

DATA STRINGS

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 43

5.6.1 Status in Data String Master/Slave

b3 b2 b1 b0

Meaning

Status nibble:

x x x 0 No announcement hour
x x x 1 announcement (DST-ST-DST)
x x 0 x Standard time (ST)
x x 1 x Daylight saving time (DST)
x 0 x x No announcement switchover second
x 1 x x Announcement switchover second
0 x x x Quartz mode
1 x x x Radio-controlled mode (high accuracy))

Day of the week nibble:

0 0 0 1 Monday
0 0 1 0 Tuesday
0 0 1 1 Wednesday
0 1 0 0 Thursday
0 1 0 1 Friday
0 1 1 0 Saturday
0 1 1 1 Sunday

Example: (STX)831234560301968230(LF)(CR)(ETX)

Radio-controlled mode, no announcement, standard time
It is Wednesday 03.01.96 - 12:34:56 hrs.
The time difference to UTC is + 2.30 hrs.

5.6.2 Setting

To synchronize the hopf slave systems the following settings are required:

• Output every minute

• Output second forerun

• ETX at the second change

• 9600 Baud, 8 bit, 1 stop bit, no parity

With these settings there is optimal control of the time basis in the slave systems.

Please Note: THE OUTPUT OF UTC TIME CAN BE ACTIVATED FOR SPECIAL APPLICATIONS.

DATA STRINGS

Page 44 GPS Satellite Controlled Clock 6875 - Ver. 04.00

5.7 GPS2000 Data String

With the GPS2000 data string systems can be synchronized to an accuracy of ± 1 µsec with the
time data of the master system.

The whole data string has the following structure:

Current char. no.: Meaning Value (value range)

1 SOH (start of header) $01
2 hundreds day in the year $30-33
3 tens day in the year $30-39
4 unit day in the year $30-39
5 : (colon) $3A
6 tens hours $30-39
7 unit hours $30-36
8 : (colon) $3A
9 tens minutes $30-33
10 unit minutes $30-39
11 : (colon) $3A
12 tens seconds $30-39
13 unit seconds $30-39
14 time accuracy $3F, $23, $2A, $2E, $20
15 CR (carriage return) $0D
16 LF (line feed) $0A

5.7.1 Time Accuracy in the GPS2000Data String

Hex-

value

ASCII-

value

Description

Meaning, details of accuracy

$3F ? question mark Error greater than 1 msec
$23 # double dagger Error greater than 100 µsec
$2A * star Error greater than 10 µsec
$2E . point Error greater than 1 µsec
$20 space Error greater than 1 µsec

Example: (SOH)042:12:34:56*(CR)(LF)

It is day of the year 42, 12:34:56 hrs., the system time inaccuracy is greater than 10 µsec.

DATA STRINGS

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 45

5.7.2 Configuration for GPS2000 Data String

For exact synchronization of the equipment the following settings must are required:

For the first serial interface (e.g. COM0 in 6875)

• 9600 Baud, 8 bit, 1 stop bit, even parity

• Output every second

• Control characters: standard (direct, without delay)

• Time basis and second forerun as required

• Transmission time: every second

• CR -> LF

In addition the output of a second pulse is required at the 2nd RS232 serial interface. The pulse
width is 10 msec. The falling edge is synchronized to the second mark.

The pulse must be configured separately (e.g. in 6875: IMP1 as cyclical output every second,
pulse length 10 msec; emit IMP1 to COM1 as RS232).

DATA STRINGS

Page 46 GPS Satellite Controlled Clock 6875 - Ver. 04.00

5.8 Data String SAT 1703 Time String

The SAT 1703 Time String can be transmitted with all modes (e.g. with forerun or ETX to the
second change).

The SAT 1703 Time String can also be transmitted on request. The point of transmission will be
set to "transmission on request" and the data string can be requested by "?".

5.8.1 Specified Settings

All parameter are free adjustable

o Baud rate: 9600 Baud
o Data bits: 8
o Stop bit(s): 1
o Parity: no
o Point of transmission: every second
o Second forerun: no
o Control character: yes
o CR/LF: CR Ö LF

5.8.2 Data String Structure

Character No. Meaning Hex-Value

1 STX (start of text) $02
2 tens day $30-33
3 unit day $30-39
4 "." $2E
5 tens month $30-31
6 unit month $30-39
7 "." $2E
8 tens year $30-39

9 unit year $30-39
10 "/" $2F
11 day of the week $31-37
12 "/" $2F
13 tens hour $30-32
14 unit hour $30-39
15 ":" $3A
16 tens minute $30-35
17 unit minute $30-39
18 ":" $3A
19 tens second $30-35
20 unit second $30-39

DATA STRINGS

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 47

Character No. Meaning Hex-Value

21 "M" or "M" or "U" $4D, $4D, $55
22 "E" or "E" or "T" $45, $45, $54
23 "Z" or "S" or "C" $5A, $53, $43
24 " " or "Z" or " "

(standard time

[CET],

summer time

[CEST]

or UTC)

$20, $5A, $20

25

" " ($20 Ö synchronous) or
"*" ($2A Ö not synchronous)

$20
$2A

26

" " ($20 Ö no announcement) or
"!" ($21 Ö announcement of S/D- or
D/S-changeover)

$20
$21

27 CR (carriage return) $0D
28 LF (line feed) $0A
29 ETX $03

5.8.3 Data String Example

(STX)18.07.02/4/02:34:45UTC_ _(CR)(LF)(ETX)

• It is Thursday 18.07.2002 - 02:34:45 o'clock UTC

• The clock is synchronised with GPS

DATA STRINGS

Page 48 GPS Satellite Controlled Clock 6875 - Ver. 04.00

5.9 SINEC H1 Extended

The SINEC H! Extended String can be transmitted with all modes (e.g. with forerun or ETX to
the second change).

The SINE H1 Extended String can also be transmitted on request. The point of transmission will
be set to "transmission on request" and the data string can be requested by "?".

5.9.1 Data String Structure

character no. meaning value (value range)

1 STX (start of text) $02
2 "D" ASCII D $44
3 ":" colon $3A
4 tens day $30-33
5 unit day $30-39
6 "." point $2E
7 tens month $30-31
8 unit month $30-39
9 "." point $2E
10 tens year $30-39
11 unit year $30-39
12 ";" semicolon $3B
13 "T" ASCII T $54
14 ":" colon $3A
15 day of the week $31-37
16 ";" semicolon $3B
17 "U" ASCII U $55
18 ":" colon $3A
19 tens hours $30-32
20 unit hours $30-39
21 "." point $2E
22 tens minute $30-35
23 unit minute $30-39
24 "." point $2E
25 tens seconds $30-36
26 unit seconds $30-39
27 ";" semicolon $3B
28 "#" or space $23 / $20
29 "*" or space $2A / $20
30 "S", "U" or space $53 / $55 / $20
31 "!", "A" or space $21 / $41 / $20
32 ETX (end of text) $03

DATA STRINGS

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 49

5.9.2 Status

The characters 28-31 in the data string SINEC H1 Extended give information about the syn­chronisation status of the clock.

meaning of the following:

character no.:28 = "#" no radio synchronisation after reset, time invalid
space radio synchronisation after reset, clock at least in crystal
operation

character no.: 29 = "*" time from the internal crystal
space time from radio reception

character no.: 30 = "S" daylight saving time
"U" UTC
space standard time

character no.: 31 = "!" announcement of a W/S or S/W changeover
"A" announcement of a leap second
space no announcement

5.9.3 Example of a Transmitted Data String

(STX)D:03.01.96;T:3;U:12.34.56; _ _ _ _ (ETX) ( _) = Space

radio operation, no announcement, standard time
It is Wednesday 03.01.96 - 12:34:56 h

EXAMPLES OF CONNECTIONS

Page 50 GPS Satellite Controlled Clock 6875 - Ver. 04.00

6 Examples of connections

6.1 Assignment of the screw clips

6.1.1 Examples of connections for OC1-3

Active, positive pulse

EXAMPLES OF CONNECTIONS

GPS Satellite Controlled Clock 6875 - Ver. 04.00 Page 51

Active, negative pulse

Passive, positive pulse

DIMENSIONS OF SNAP-IN MODULE HOUSING

Page 52 GPS Satellite Controlled Clock 6875 - Ver. 04.00

7 Dimensions of Snap-in Module Housing

Clip fastening for
mounting rail DIN EN 50 022

Klammerbefestigun g für
Tragschiene DIN EN 50022
7,5mm x 35mm oder 15mm x 35mm

7,5mm x 35mm oder 15mm x 35mm

Earth Screw

Erdungsschraube

64,5 (2.54”)

153,5 (6.04”)

105,0 (4.13”)

26,0

(1.02”)

76,0 (2.99”)

15,0

(0.59”)

130,0 (5.12”)

23,0

(0.91”)

48,0 (1.89”)

79,5 (3.13”)

105,0 (4.13”)

8 Glossary und Abbreviations

UTC Universal time coordinated

GPS Global positioning system

DCF77 (D) Deutsches (C) Langwellensignal (F) Frankfurt a.M. (77) Fre-

quenz in kHz German longwave signal Frankfurt a.M. Frequency
in kHz

PPS Pulse Per Second

Standard time Standard time – wintertime

DST Daylight Saving Time - summertime

IRIG-B Inter-Range Instrumentation Group B

AFNOR L’Association Française de Normalisation - Französische Gesell-

schaft für Normung (French Standards Association)

IEEE Institute of Electrical and Electronics Engineers

FL Fiber Optic Link