hopf 6870 Technical Description
Technical Description
GPS Satellite Clock
6870
Version 15.01 08.07.2011
COMPANY INFO
Page 2 GPS Satellite Clock 6870 - Ver. 15.01
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.
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: info@hopf.com
TABLE OF CONTENTS
CONTENTS Page
GPS Satellite Clock 6870 - Ver. 15.01 Page 3
1 Brief Information Model 6870 and Delivered Extras 5
2 Introduction 6
3 Commissioning 7
3.1 Voltage Supply 7
3.2 Antenna Installation 7
3.3 Default Button in the Front Panel 7
3.4 LED "CLK" 7
3.5 Control LED C1-C3 7
3.6 Set-up via Remote Software 8
3.6.1 Pre-conditions of the System for the Remote Software 8
3.6.2 Hints for the Installation of the Remote Software 8
3.6.3 What You Should Know 9
3.6.4 Possible Errors in the Transmission with GPS-6870.EXE 10
4 Range of Functions of the Remote Software 11
4.1 The File Setup Menu 11
4.1.1 Saving the Current Setup in a File 11
4.1.2 Saving the Stored Clock Data 11
4.1.3 Viewing the Current Setup 11
4.1.4 Transmission of the Current Setup to the Clock 11
4.1.5 Structure of the Setup File 12
4.1.6 Supervision of the Output Data String 13
4.1.7 Printing the Setup Settings 13
4.2 Initialising the GPS - Receiver 14
4.2.1 Setting Time and Date 14
4.2.2 Entering the Points of Changeover 15
4.2.3 Setting the Difference UTC/Local 15
4.2.4 Setting the Day Offset 16
4.2.5 Setting the Position Data 16
4.2.6 Time Decoding 3D / Position fix 17
4.2.7 DCF77-Simulation and Radio-Bit 18
4.2.8 Setting the Optical Coupler Outputs 19
4.2.9 System Byte settings 21
4.2.10 Reset Function 23
4.3 Supervision of the GPS- Receiver 23
4.3.1 Time and Date 23
4.3.2 Points of Changeover 23
4.3.3 Difference Local-UTC 23
4.3.4 Position 23
4.3.5 Reception Quality 24
4.3.6 Firmware Revision 25
5 Signal and Data Output 26
5.1 IRIG Time Code 26
5.1.1 IRIG Time Code Structure and Timing-Diagram 27
5.1.2 Format categories IRIG-Bxxx according to IRIG Standard 200-04 28
5.1.3 IRIG IEEE 1344-1995 28
5.1.4 AFNOR NFS 87-500 28
5.2 Configuration of the Serial Interfaces 29
5.2.1 Configuration of the serial parameter 29
5.3 Configuration of the Data String (Mode byte 1) 30
5.3.1 Time information output 30
5.3.2 Control Characters 31
5.3.3 Control Characters (CR, LF) 31
5.3.4 Forerun 31
5.3.5 Transmission Point of Time 31
5.3.6 Selection of Data String with Mode byte 2 32
5.4 Data Format of the Serial Transmission 33
5.5 Serial Request 34
5.5.1 Serial Request in the Standard String 6021 34
5.5.2 Serial Request in MADAM S 34
5.5.3 Serial Request in T-String, ABB_S_T and NTGS 34
5.5.4 Serial Request in SINEC H1 34
TABLE OF CONTENTS - CONTINUED
CONTENTS Page
Page 4 GPS Satellite Clock 6870 - Ver. 15.01
6 Data Strings 35
6.1 General Information on the Data Output of 6870 35
6.2 Data String 6870/6021 Time and Date 36
6.2.1 Data String 6870/6021 Time Only 36
6.2.2 Status and Day of the Week Nibble in the Data String 6870/6021 Standard 37
6.2.3 Example of a Transmitted Data String 6870/6021 (Standard) 37
6.3 Data String DCF-Slave 38
6.3.1 Status in the Data String DCF-Slave 38
6.3.2 Example of a Transmitted Data String DCF-Slave 39
6.3.3 Setting 39
6.4 Data String SINEC H1 40
6.4.1 Status in the Data String SINEC H1 41
6.4.2 Example of a Transmitted Data String SINEC H1 41
6.5 Data String MADAM-S 42
6.5.1 Required Setting for Output MADAM-S 44
6.5.2 Status Nibble in the Data String MADAM-S 44
6.6 Data String IBM 9037 / Sysplex Timer 45
6.6.1 Status in the Data String IBM 9037 / Sysplex Timer 45
6.6.2 Example of a transmitted Data String IBM 9037 / Sysplex Timer 45
6.7 Data String 6870/6021 String 2000 46
6.7.1 Status in the Data String 2000 47
6.7.2 Example of a Transmitted Data String 2000 47
6.8 Data String T-String 48
6.8.1 Example of a Transmitted Data String T-String 48
6.9 Data String ABB_T_S 49
6.10 Data String TimeServ for the Operating System Windows NT 49
6.11 Data String for NTP (Network Time Protocol) 50
6.12 Data String NTGS-String 51
6.12.1 example of a transmitted data string NTGS 51
6.13 Master/Slave-String 52
6.13.1 Status in the Data String Master-Slave 53
6.13.2 Example of Transmitted Data String Master/Slave 53
6.13.3 Setting 53
6.14 SPT-String 54
6.15 Data String SAT 1703 Time String 56
6.15.1 Specified Settings 56
6.15.2 Data String Structure 56
6.15.3 Data String Example 57
6.16 SINEC H1 Extended 58
6.16.1 Status 59
6.16.2 Example of a Transmitted Data String 59
6.17 NMEA - GPRMC 60
6.17.1 Structure of the data string 61
6.17.2 Example of a Transmitted Data String 62
6.18 Data String NMEA (GPZDA) 63
6.18.1 String Structure 64
6.18.2 Example of a Transmitted Data String 65
7 Serial Interface and Screw Terminals 66
7.1 Pin Allocation of the 9-pole SUB-D Connector 66
7.1.1 Version 1 - RS232 and RS422 (Standard) 66
7.1.2 Version 2 - RS232 / RS232 66
7.1.3 Version 3 - RS232 / TTY 66
7.1.4 Version 4 - RS232 / pulse (PPS / DCF77) 67
7.1.5 Version 5 - IRIG-B with RS232 and RS422 67
7.1.6 Version 6 - RS232 and NTGS-pulse 67
7.2 Allocation of the Screw Terminals 68
7.2.1 Examples for assignment 68
8 Technical Data 70
BRIEF INFORMATION MODEL 6870 AND DELIVERED EXTRAS
GPS Satellite Clock 6870 - Ver. 15.01 Page 5
1 Brief Information Model 6870 and Delivered Extras
The radio controlled clock 6870 is an all-purpose GPS1 reception module - ideal to synchronise
industrial processes. The snap-in module can be supplied with various combinations of interfaces.
Up to 16 different protocols can be put out via the interfaces, to synchronise devices by different
producers (Siemens, ABB, IBM, H+B).
Three built-in optical couplers can be used to synchronize computers, control systems or measuring processes, with freely programmable pulses. Every optical coupler can carry out one of 5
output programmes, whereby either cyclic pulses are generated or status information is about at
the outputs.
A simulated antenna signal is available to DCF772 systems. Further features are:
potential free antenna circuit,
all settings can be parametered via serial interface,
all outputs potential free,
two independent serial interfaces RS232/RS422, other combinations e.g.
RS232/TTY (passive) or RS232/RS232 are available on request.
We supply the snap-in module with:
PC interface cable and
configuration software on CD-Rom.
1
GPS = global positioning system
2
DCF77 = (D) german - (C) long wave signal (F) Frankfurt a.M. (77) frequency
INTRODUCTION
Page 6 GPS Satellite Clock 6870 - Ver. 15.01
2 Introduction
The
hopf
radio controlled and crystal clock systems, well proved since 1975, have been extended by GPS reception unit 6870. This guarantees a world-wide use at highest precision. The
time basis is synchronised by GPS, a globally installed satellite system.
At a height of about 10.900 miles satellites circle around the earth twice a day on different orbits
and angles (see picture in the appendix). On board every satellite there is an atomic clock (accuracy at least 1 x 10
-12
). The GPS reception units receive the orbit position and a GPS worldtime from as many satellites as possible. The position of the receiver is calculated from these
values first. Once the position is known, it is possible to calculate the delay time of the received
GPS world-time. The accuracy of the time therefore depends mainly on how well the position is
defined.
The world-time UTC3 is calculated by subtracting the leap seconds from the GPS-world-time
(GPS-UTC), at present (1994) the world-time lags 8 seconds behind GPS-UTC. The difference
is not constant, it changes with every insertion of a leap second. For every place on earth it is
possible to enter the difference to UTC time and the local changeover points for summer/ wintertime by means of the key-pad of the system. Thus the local time is available at high precision
for further use.
The following interfaces are available as a standard:
serial RS232 interface
serial RS422 interface
DCF77 simulated antenna output
3 optical coupler outputs
Other interface combinations like RS232/TTY or RS232/RS232 are available optionally.
3
UTC = universal time coordinated
COMMISSIONING
GPS Satellite Clock 6870 - Ver. 15.01 Page 7
3 Commissioning
3.1 Voltage Supply
The system is supplied with a voltage of 18-60V DC. When connecting the voltage make sure
that the voltage and polarity are correct. As the snap-in module is completely potential free inside, it must be set to the necessary potential by means of the earthing screw on the rear.
Please Note: REVERSED POLARITY OF THE OPERATING VOLTAGE DOES NOT DESTROY THE
PACKAGE. THERE IS A BRIEF CURRENT OF 1 A. AFTER A REVERSED POLARITY THE
DEVICE MUST BE DISCONNECTED FROM THE VOLTAGE SUPPLY FOR 20 SEC. NOBODY BUT SPECIALISED PERSONNEL MUST CARRY OUT THE COMMISSIONING.
3.2 Antenna Installation
The connection to the antenna system is made by the female connector marked "GPS-In".
The correct installation of the antenna system can be found in the Appendix GPS (General
System Information GPS).
3.3 Default Button in the Front Panel
Pressing the "DEF" button on the front puts the clock in the delivery status. It must be pressed
for about 10sec. until the LED "CLK" stops flashing. Release the button and the clock is put into the following standard setting.
The parameter of both interfaces (COM0 + COM1) will be set back!
Delivery status:
baud rate 9600 Baud
8 data bit
1 stop bit
no parity
transmission data string (6021)
with control characters (STX/ETX)
without second advance
transmission every second
3.4 LED "CLK"
The green status LED indicates the synchronisation status of the clock. Flashing at 2 Hz pulse
means that the clock is running in crystal operation. This status is shown after switching the
clock on or when the time-out time for the radio-bit has been exceeded (see pt. DCF77 simulation and radio-bit) when the reception is disturbed. Flashing at 1Hz pulse means that the clock
is running in radio operation.
3.5 Control LED C1-C3
The LED C1-C3 indicate the switching status of the three optical couplers. A lit LED indicates
that the corresponding optical coupler is switched active.
COMMISSIONING
Page 8 GPS Satellite Clock 6870 - Ver. 15.01
3.6 Set-up via Remote Software
All the settings on the device can be carried out with the supplied software (GPS_6870.EXE) via
one of the both serial interfaces.
At the same time only one service software might have access to the device by one of the serial
interfaces.
3.6.1 Pre-conditions of the System for the Remote Software
The program requires a PC/Notebook with a free serial interface and the operating system Microsoft Windows from 3.x, 95, or NT. A free serial interface (COM 1 ... COM 8) is needed for the
data traffic with the clock. Before the beginning of a data transmission, the software checks the
existence of a free COM-port.
3.6.2 Hints for the Installation of the Remote Software
The software is supplied on a 3.5 inch disc and should be copied into its own directory in the
remote computer (PC) (e.g. C:\HOPF6870). The supplied serial interface cable must be connected between the computer and the GPS system. Then the software is ready for operation.
When the voltage supply and the antenna are connected the program can be started.
The software automatically finds the first free COM-port (1-8) and shows the connection in the
main window of the application "program connected with". This process may be ignored (see
pt. What you should know). Here you will find the actual parameter settings for the serial communication and possibly the file used for the serial parameter. If a different port should be used
the program has to be started again till the right port is connected. This port can be set-up in the
file GPS_INIT.INI (see 3.6.3).
In the main window of the application you will find all the Windows user elements like pull-down
menu, switches etc. You can operate the software either by mouse or by the key-pad of your
computer.
We advise Windows beginners to become acquainted with the Windows operations using the
Windows teaching program. Start the teaching program in the program manager or explorer under the menu item Help. You can find further instructions on how to use Window applications in
your Microsoft Windows manual.
COMMISSIONING
GPS Satellite Clock 6870 - Ver. 15.01 Page 9
3.6.3 What You Should Know
During the first installation GPS_6870.EXE (the file GPS_INIT.INI must be missing!) sets the
transmission parameter in the PC for the communication with the GPS device to the following
values.
baud rate 9600 baud
data bit 8
stop bit 1
parity bit no
These values must also be activated in the clock (status as delivered). The delivery status can
also be produced by pressing the default button (only COM 0 / see pt. "Default Button in the
Front Panel").
The changing of the parameter in the clock require also changing the setting of the COM-port of
your computer. Therefore changed parameters are stored in a text file, so that they are available after a new call-up of the program. The file will be built automatically when the standard parameter have changed.
The file is in the same directory as the program GPS_6870 and it is called:
GPS_INIT.INI
If necessary this file can also be edited manually. But the settings must correspond with the values of the particular serial interface of the clock.
Structure of the file GPS_INIT.INI:
[serial parameter]
string=9600,N,8,1
Only the part of the parameter String = may be altered
example:
old 9600,N,8,1
new 19200,E,7,2
The program works with these settings when the file is stored and GPS_6870.EXE restarted.
Please Note: IN CASE OF DOUBT YOU CAN DELETE THE FILE GPS_INIT.INI. THE PROGRAM THEN
STARTS WITH THE ABOVE STANDARD SETTINGS.
From version 4.02 of the remote software upwards, the following entry in the file GPS_INIT.INI
presets a serial port of the computer.
[serial Parameter]
Port=COM1
If the above line exists in the file GPS_INIT.INI, a window indicates after the start of the programme that this port is used.
COMMISSIONING
Page 10 GPS Satellite Clock 6870 - Ver. 15.01
You can save and load individual parameter settings under the menu item "communication"
item "load/save serial parameter". The program stores these initialisation files for individual
user configurations with the extension *.CST. These files can be edited manually corresponding
with the above described ini-file. After loading a CST file the program automatically takes over
the new settings and displays them in the main window.
3.6.4 Possible Errors in the Transmission with GPS-6870.EXE
Check if the connection cable PC-clock has a defect. There must be a connection be-
tween the signals.
Please Note: DEPENDING ON THE INTERFACE VERSION THERE ARE FURTHER SIGNALS ON THE
9 POLE SUB-D PLUG X2. THEREFORE ONLY THE FOLLOWING CONNECTIONS ARE
VALID FOR THE COMMUNICATON WITH THE REMOTE SOFTWARE.
PC
Pin
Clock
Pin
TxD 3 RxD
2
RxD
2
TxD
3
GND
5
GND
5
Check whether the connection cable is connected to the interface named by
GPS_6870.EXE.
If a transmission to the 6870 is not possible despite the correct connection there is an er-
ror in the parameter setting for the interface of the PC and the snap-in module. In this
case key "DEF" must be pressed for 10 seconds to put the interface of 6870 into the
standard setting. Then the program GPS_6870.EXE must be closed and the file
GPS_INIT.INI must be deleted on the PC. The program GPS_6870.EXE must be executed again.
System 6870 not ready for operation (e.g. no operating voltage).
RANGE OF FUNCTIONS OF THE REMOTE SOFTWARE
GPS Satellite Clock 6870 - Ver. 15.01 Page 11
4 Range of Functions of the Remote Software
The main menu of the software is divided into five functional groups:
(FILE) : here you will find the commands to save, load, print, view and
configure by means of set-up . There is also a function to control
the put out data string.
(SET): Initialising the GPS-receiver and configuring the outputs of the
optical couplers
(SHOW): Supervising the setting of the system and alignment of the anten-
na.
(COMMUNICATION): Setting up the interfaces for the serial data transmission
(HELP): Help and information about the programme version
4.1 The File Setup Menu
All the settings under the menus "SET" and "COMMUNICATION" can be written into an external file to configure other clocks with it. The setup file can be edited manually. For further information please refer to pt. "Structure of the setup file" and the programming manual of the
clock.
4.1.1 Saving the Current Setup in a File
This function serves to save all those settings which have been transferred to the clock up to
that point together in one file. It therefore requires one operation only to configure further clocks
with the same settings at a later date.
First all the information required for the configuration must be transferred to the clock. After that
the current settings can be saved in a file with the affix "*.stp" by calling up the menu item
"save actual setup to file".
4.1.2 Saving the Stored Clock Data
With the menu point "load setup from device" the stored data in the clock can be transmitted
to the PC. After this the complete data can be saved in a file by using the point "save actual
setup to file".
4.1.3 Viewing the Current Setup
All data which have either been transferred to the clock or loaded from a file can be checked in
a window by calling up the menu item "show actual setup". The assumption is made in four
groups.
1. System information (date of changeover, difference time, reception mode, DCF77
simulation, synchronisation bit, system byte and position)
2. configuration of interfaces COM 0 (parameter byte, mode byte 1, mode byte 2)
3. configuration of interfaces COM 1 (parameter byte, mode byte 1, mode byte 2)
4. setting of the optical coupler (OK 1 to 3)
4.1.4 Transmission of the Current Setup to the Clock
The currently loaded or intended settings are transferred to the clock in one operation by the
command "send setup to device" . When the menu item has been activated a status window
pops up demanding "start" or "exit". Using the "start" switch transfers the current settings to
the clock. Use the "exit" switch to leave the programme.
RANGE OF FUNCTIONS OF THE REMOTE SOFTWARE
Page 12 GPS Satellite Clock 6870 - Ver. 15.01
During the transmission the settings currently being transferred to the clock are listed in the status window. Only those settings which have an entry are transmitted to the clock. If the operation is successfully completed it is indicated by "system settings successfully stored!".
In case of a fault in the transmission the command "GPS-system did not accept parameters"
will be shown. For this case see 3.6.4 (possible errors).
4.1.5 Structure of the Setup File
The setup files can be altered manually, but the following things must be considered:
1. There are small and capital letters.
2. There must not be a space between equals signs (=).
3. If an entry is to stay empty the part on the left of the equals sign and the sign itself
must remain.
4. A semicolon turns the rest of the line into a comment.
5. The clock must be able to interpret the settings, faulty entries may cause errors in the
clock. For more detailed descriptions of the individual entries please refer to the programming manual of the clock.
[COM_0] ; range interface COM 0
String=PAR:09600,N,8,1 ; parameter of the serial transmission
Mode1=MOD:1,1,0,1,1,0,0,0 ; modebyte 1
Mode2=MO1:0,0,0,0,0,0,0,0 ; modebyte 2
[COM_1] ; range interface COM 1
String=PA1:02400,N,8,11 ; parameter of the serial transmission
Mode1=MO2:1,1,1,1,1,0,0,1 ; modebyte 1
Mode2=MO3:0,0,0,0,1,0,0,0 ; modebyte 2
[System] ; range system settings
ChangeOver=COS:4A,02,03,52,03,10 ; times of changeover summer/winter
Difference=DIF:+01,00 ; difference time UTC/local
Reception=SAT:0 ; reception mode 3D/position fixed
Simulation=DCF:02,C8,64,02 ; DCF77 simulation and radio bit
SysByte=SYB:0,1,0,1,0,1,0,1 ; System byte settings
Position=POS:E:007,39,81,N:51,12,69 ; position data
[Pulses] ; range optical coupler
ok1=IMP:1,02,00,00,00,00,00,00,00 ; setting for optical coupler 1
ok2=IMP:2,02,00,00,00,00,00,00,00 ; setting for optical coupler 2
ok3=IMP:3,02,00,00,00,00,00,00,00 ; setting for optical coupler 3
Please Note: THE ENTRIES TO THE RIGHT OF THE EQUALS SIGN CORRESPOND WITH THE TRANS-
MITTED CONFIGURATION DATA STRING (WITHOUT CONTROL CHARACTERS) TO THE
CLOCK AS DESCRIBED IN THE PROGRAMMING MANUAL.
RANGE OF FUNCTIONS OF THE REMOTE SOFTWARE
GPS Satellite Clock 6870 - Ver. 15.01 Page 13
4.1.6 Supervision of the Output Data String
The serial output data strings can be supervised by means of the menu item "test serial output".
The presently set baud rate is shown in the line "speed = 9600 baud".
The data output can be change from ASCII to HEX by "select char mode". In the picture
above the output mode "ASCII" has been selected.
The individual characters are interpreted and put out as ASCII characters. The control charac-
ters stx, soh, etx, cr and lf are displayed as a string. The other control characters are put out
hexadecimally with a percent sign in front (example %7F). When the last character shows up
delayed and with three points in front it means that the mechanism "last control character on
the second change" is activated.
In the operating mode "Hex" all characters are put out as hexadecimal values. A transmitted
ASCII “1“ would be displayed as "31".
A request string can be entered in the editing field "Text to send" which is transferred to the
clock by means of the "send" switch. Leave the dialogue by using the "ok" switch.
Please Note: IF YOU HAVE SET A BAUD RATE WITH WHICH THE TRANSMISSION OF THE COMPLETE
STRING TAKES MORE THAN A SECOND, IT MAY CAUSE ERRORS IN THE OUTPUT PROCESS. THE SAME APPLIES TO THE SET PROCESS "OUTPUT LAST CONTROL CHAR-
ACTER ON THE SECOND CHANGE" IF THE REQUEST COMES SHORTLY BEFORE THE
SECOND CHANGE VIA THE "SEND" SWITCH.
4.1.7 Printing the Setup Settings
This menu item can be used to have the current set-up settings printed out by a connected
printer. The output is made analogue to the "file-menu" entry "show actual setup".
RANGE OF FUNCTIONS OF THE REMOTE SOFTWARE
Page 14 GPS Satellite Clock 6870 - Ver. 15.01
4.2 Initialising the GPS - Receiver
Setting start values in the GPS system increases the synchronisation speed of the clock. Start
values need not be entered, but the first radio reception may take up to 4 hours without initialisation.
Keep the following sequence when setting start values in the system.
input of the actual local time
input of the position data
input of the difference time UTC-local
input of the change over date
release a reset of the clock (after the next minute change)
Below the individual menu items of the program are explained.
4.2.1 Setting Time and Date
You will find the set-time-function under the menu item "set" and the entry "time/date". Then
the "set time and date" dialog appears. The program automatically takes over the time set in
the computer into the editing field of the dialog.
You can change the time by moving the scroll bar next to the displays. After setting the correct
time, start the transmission to the clock with the "send" switch. In the status field "transmit
buffer" the data string which was transmitted to the clock appears. When the transmission is
successful the same data string is shown in the "receive buffer".
RANGE OF FUNCTIONS OF THE REMOTE SOFTWARE
GPS Satellite Clock 6870 - Ver. 15.01 Page 15
4.2.2 Entering the Points of Changeover
You'll find the function 'set points of changeover' in the menu under "set" and the entry
"changeover date". The "changeover settings" dialogue appears.
Before activating the dialogue the current settings are read from the clock and displayed in the
editing field. Here the points of time are entered when during the course of a year the time is to
changeover to either daylight saving time or standard time on location.
The line start day states when the daylight saving time is to start. The line end day states the
point when the daylight saving time ends. Changeovers can take place either on the first, second, third, fourth or last day of the month. Additionally a time in hours and minutes is required.
Change over dates can only be set, when the checkbox automatically set daylight saving
time is activated. The change over will only be carried out, if the checkbox automatically set
daylight saving time has been clicked. The fields offset from UTC and daylight bias have
only informative value.
Once the data are entered please start the transmission to the clock by means of the "send"
switch. A pop-up menu appears telling you that the information has been taken over by the
clock.
Please Note: IF YOU DON'T WANT CHANGE OVER DATES, DEACTIVATE THE CHECKBOX "AUTO-
MATICALLY SET DAYLIGHT SAVING TIME" AND PUSH THE "SEND" SWITCH.
After the entry of the data use the "send" switch to start the transmission to the clock. The popup window tells us that the information has been taken over by the clock.
4.2.3 Setting the Difference UTC/Local
This function serves to enter the time difference between the local time and the world-time (UTC
time).
The difference time is entered in hours and minutes, extended by the information whether the
location lies to the east or west of the 0 longitude (Greenwich).
e.g. West 08:00 for the USA and Canada (Pacific Time)
e.g. East 09:30 for Adelaide Australia
RANGE OF FUNCTIONS OF THE REMOTE SOFTWARE
Page 16 GPS Satellite Clock 6870 - Ver. 15.01
You find the set-difference time-function under
the menu item "set" and the entry "difference
local/UTC". The "set difference local/UTC"
dialog appears.
Enter the actual data into the fields for hour
and minute by moving the scroll bar. Click at
the correct field for the direction (West/East).
After entering the data use the "send" switch
to start the transmission to the clock.
The new time bias is calculated at the next minute change.
4.2.4 Setting the Day Offset
This function is only available in connection with special software FG687083.
In combination with this software the NTGS-pulse output and the DCF77 pulse output are not
available. Furthermore only the "local time" is valid for DCF77-Sim and IRIG-B.
4.2.5 Setting the Position Data
This function serves to enter the geographical position of the device. This function helps during
the first installation but it is not necessary, it shortens the new initialisation of the GPS-receiver.
Degrees, minutes and 1/100 minutes are used for the entry of latitudes and longitudes.
Additionally the following information must be given for the latitude.
North = northern hemisphere
South = southern hemisphere
example: North 51°12,36 51
The entry of the longitude requires the following information.
East = east of the 0 meridian
West = west of the 0 meridian
example: East 007°37,8426
The GPS-receiver needs, for a faster synchronisation, only the entry of the rough position. For
the exact position in the above example the following entry would suffice:
North 50°00,0000
East 007°00,0000
You can find the set-position-function under the menu item "set" and the entry "position". The
"set positioning data" dialog appears. Enter the actual data into the fields for latitude and lon-
gitude in degrees and 1/100 minutes by using the scroll bar.
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GPS Satellite Clock 6870 - Ver. 15.01 Page 17
Click the correct fields for latitude (north / south) and longitude (west/ east).
After entering the data use the "send" switch to start the transmission to the clock. If the transmission was successful a pop-up window appears with the message "new values are stored
in clock device".
4.2.6 Time Decoding 3D / Position fix
The accuracy of the time decoding depends on how accurately the position of the operational
location is calculated. At least the reception of 4 satellites is required (3D-decoding). From the
calculated position the transit time of the signal to several satellites is found and the second
marker is produced from the average transit times. The 3D-decoding mode allows the second
marker to have an accuracy of ± 1 sec.
In case of a fixed position quite often a less substantial decoding of the second marker suffices
e.g. up to some milliseconds. In the position-fix mode the accuracy depends mainly on the precise entry of the position of the location of the installation. The calculation of the second marker
starts with one satellite and the entered position already. An entry of the position to ± 1 minute
degree achieves an accuracy of the second marker better than ± 20 sec. An entry even more
precise can achieve the value ± 1 sec.
The position-fix mode has the advantage that the clock synchronises with only one satellite. The
antenna may be installed somewhere where less than ¼ of the sky is visible.
Often it is possible to install the antenna indoors at the window (short cable, no lightning protection). If 4 satellites are visible in this mode, the decoding jumps automatically into the 3D-mode
and calculates the exact position improving the accuracy to ± 5 sec. for one satellite.
Under the menu item "set" you will find the entry "mode of reception". After selecting one of
these modes, the dialog "quality of reception" appears. The list box "quality of reception"
shows you the actual settings.
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Page 18 GPS Satellite Clock 6870 - Ver. 15.01
4.2.7 DCF77-Simulation and Radio-Bit
The output of the DCF77-simulation and of the radio-bit (see pt. "pulse output mode 2" and "status information in the serial data strings") are configured under this menu item.
The transmitter DCF77 broadcasts a data string, which transmits the time information with one
bit per second. Lowering the amplitude of the DCF77-Signal for 100 or 200 msec codes the digital information (0/1). The narrow-band antennas of some radio controlled clocks falsify the duration of the dip and therefore the following receiver is adjusted to different pulse durations.
The base time for the DCF77-simulation can be changed with the system byte (see pt. 4.6.4).
The width of the low-high pulses for the DCF77-simulation can be adjusted to the operation with
such alien products. You find the "DCF77-simulation and sync. bit" dialog under the "set"
menu. After the selection the shown dialog box is displayed.
The lengths for low- and high pulse times of the DCF77-simulation are selected in the group
window "pulse length". The scroll bar "time out after xx minutes" can be used to switch off
the output of the simulation when changing into crystal operation after the set time (2-254
minutes). If the value is set to 255 the simulation is not switched off. These settings have an effect on the DCF77 antenna simulation via the BNC connector on the front panel and on a possibly set DCF77-simulation to the optical coupler and on the status LED on the front.
The scroll bar in the group "sync bit settings" can be used to delay the transfer of information
"radio" (changeover from radio to crystal operation) by 2-254 minutes. When the value is 255
minutes the information "radio" is always transmitted. The clock have to be synchronous once.
This method has an effect on the transmission of the synchronisation status in the put out data
strings of the serial interface and on a possibly set "radio bit" at the optical couplers.
The possibility to delay the switch-off of the DCF77-simulation and radio bit serves to bridge
small reception gaps, where the clock module 6870 does not fall short of the required accuracy
due to its internal control. Therefor the clock must be radio synchronised (see pt. 4.2.9 System
Byte settings).
Example: If an accuracy of more than 1 msec is required, the second pulse produced at the
output must not deviate from the absolute time mark by more than ±1 msec. In case of a maximum crystal drift (0.1 ppm) in free-running situation, this value would be reached after 1000 /
0,1 = 10.000 seconds. A signalling of the crystal operation would be necessary after 166
minutes.
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GPS Satellite Clock 6870 - Ver. 15.01 Page 19
4.2.8 Setting the Optical Coupler Outputs
The clock module has three optical coupler outputs which can take over different functions. You
find the "opto coupler settings" dialog under the "set" menu. Once selected the dialog box
below is shown. The actual setting for the respective output appears when the checkbox for optical couplers 1-3 in the top left corner of the dialog is clicked.
The different functions are called modes and selected in the group window "select mode". Only one setting each can be selected. Depending on the selected function (mode), either the time
information in the group window "time information" or the value for the pulse width can be set
in the window "cycle time". If no time settings are possible for the selected mode, "xxx" appears in involved editing fields. The pulses can be put out inverted in the modes 1, 4 and 5 by
activating the checkbox "output pulses inverted". This function does not make sense in the
modes 2 and 3 because the voltage failure causes an error message at the outputs. A detailed
description of the modes is given in the following paragraphs. The settings for each optical coupler must be send separately.
Please Note: IF THE VALUE FOR THE DAY AND MONTH IN MODE 5 IS SET TO "00", EVERY DAY A
PULSE IS SENT AT THE ENTERED TIME.
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Page 20 GPS Satellite Clock 6870 - Ver. 15.01
4.2.8.1 DCF77-Simulation (Mode 1)
The local time information is put out as DCF77 simulation in a data string at the according optical coupler. This setting serves the synchronisation of further DCF77 radio controlled clocks
with 1 Hz pulse input e.g.
hopf
_6036, 4980. The signal can also be put out invertedly. The set-
tings for time information and cycle time are deactivated.
4.2.8.2 Information about the Synchronisation (Mode 2)
In this setting the internal clock status (radio bit) is shown at the output. If the optical coupler is
switched active the clock module receives radio signals. A drop of the signal means crystal operation.
Please pay attention to the best setting of a delayed changeover of radio- to crystal operation in
the dialog "DCF77-Simulation and radio bit" in chapter 4.2.7.
4.2.8.3 Alarm Message (Mode 3)
In this mode the output is switched through when the voltage is supplied. In case of errors or
failures the signal drops, signalling an alarm.
4.2.8.4 Cyclic Pulses within 24 hours (Mode 4)
In this mode cyclic pulses with changeable pulse band are produced at the output. The following
pulse intervals are possible.
every 1, 2, 3, 4, 6, 8, 12, 24 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 setting 24 hour pulse interval requires the entry of naughts in all data positions in the group
time information". The fields “day“, “month“ and “year“ are deactivated. The pulse duration
is selectable within the range of 10-2550 msec. in steps of 10 msec. The pulse duration should
not be more than the cycle time, because in that case the output stays permanently switched
active. The signal output can be inverted.
4.2.8.5 Single Pulse per Day or Date (Mode 5)
This mode produces either a single pulse per day or a single pulse per date at the output. The
output time of the pulse can be set by the scroll bars of the group "time information". If you select another value then "00" in the "day" field, the channel will switch active at the adjusted
date otherwise the channel will switch daily at the selected time. A given date will be checked
on validity.
The pulse duration is selectable within the range of 10-2550 msec. in steps of 10 msec. The
signal output can be inverted.
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GPS Satellite Clock 6870 - Ver. 15.01 Page 21
4.2.9 System Byte settings
This function serves to switch on/off different
internal program functions. Only bit 1-5 have
a function at present. You find the "system
byte" dialog under the "set" menu. After the
selection the shown dialog box is displayed
with the actual settings.
After entering the data use the "send"
switch to start the transmission to the clock.
(the picture shows the standard settings).
Bit no.:
switched on
switched off
8
–
–
7
radio bit always set
without antenna
radio bit set with
GPS reception
6
IRIG-B binary seconds
per day switched off
IRIG-B binary seconds per
day switched on 5 time base
4
local time / standard time / UTC-time
3
NTGS-pulse
IRIG-B output
2
UTC IRIG-B string
local time IRIG-B string
1
DCF77-simulation
pps (second pulse)
4.2.9.1 Adjustment by bit 1
The interface-variant 4 can be used for pulse output.
The output is able to drive a second pulse or the DCF77-simulation depending on the switch
setting of bit 1.
4.2.9.2 Adjustment by bit 2
Bit 2 defines the basis time in the IRIG-B data string. It can be chosen between the local time
and UTC.
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Page 22 GPS Satellite Clock 6870 - Ver. 15.01
4.2.9.3 Adjustment by bit 3
With bit 3 the output of IRIG-B data or the output of NTGS-pulse will be controlled in the program flow.
For IRIG-B is additionally the interface-variant 5 and for the NTGS-pulse the interface-variant 6
necessary.
4.2.9.4 Adjustment by bit 4 and 5
Bit 4 and 5 are used to chose different time basis for the DCF77-simulation.
Bit 5
Bit 4
off
off
in the simulated DCF77-data string local time is used as time basis. The
time zone bits change according to the standard or daylight-saving time. The
time zone changeover is announced 1 hour before.
off
on
in the simulated DCF77-data string the local standard time is used as the
time basis, the standard time is continuously transmitted in the time zone
bits. There is no information of a changeover.
on
off
in the simulated DCF77-data string UTC is transmitted as time basis. The
time zone bits should normally contain the UTC information. As many DCF77
decoding programmes interpret this as an error the time zone bit is transmitted as standard time if UTC is set.
4.2.9.5 Adjustment by bit 6
With these bit you can switch on or off the running seconds per day in the IRIG-B string.
4.2.9.6 4.2.9.6. Settings Bit 7
Some computers accept a data string only under the condition that the radio bit is set in the status word. That means that tests with these computers cannot be run before the antenna is installed. By means of bit 7 a permanent GPS-reception is simulated.
Bit 7 off the radio bit is set only if there is GPS-reception. If the period of no GPS-reception
exceeds the set supervision time it is reset.
Bit 7 on the radio bit is always set even if there is no antenna connected.
Please Note: BIT 7 STAYS SET EVEN AFTER A VOLTAGE FAILURE. PLEASE TAKE THIS INTO CON-
SIDERATION WHEN YOUR TESTS ARE COMPLETED. IF THE BIT IS SWITCHED FROM
"OFF" TO "ON" THE STATUS BYTE IN THE RESPECTIVE DATA STRING IS IMMEDIATELY
SET TO "RADIO". BUT IF IT IS SWITCHED FROM "ON" TO "OFF" A RESET MUST BE
CARRIED OUT SO THAT THE INFORMATION "CRYSTAL" IS SET IN THE PUTOUT DATA
STRING.
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