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FUNKUHREN
Technical Information
Operating Instructions
GPS163TDHS
Incl. Windows Software
GPSMON32
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Impressum
Werner Meinberg
Auf der Landwehr 22
D-31812 Bad Pyrmont
Telefon: ++49 (0) 52 81 / 9309-0
Telefax: ++49 (0) 52 81 / 9309-30
Internet: http://www.meinberg.de
Email: info@meinberg.de
October 28, 2004
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Table of contents
Impressum............................................................................................ 2
General information............................................................................. 5
Block diagram GPS163TDHS....................................................6
Features of GPS163TDHS ................................................................... 7
Time zone and daylight saving .................................................. 7
Pulse outputs .............................................................................. 8
DCF77 emulation ....................................................................... 9
Asynchronous serial ports........................................................10
IRIG-outputs............................................................................. 10
Introduction..................................................................... 10
Available time codes ...................................................... 11
Code generation .............................................................. 11
IRIG standard format......................................................12
AFNOR time code format............................................... 13
Assignment of CF Segment in IEEE1344 mode ............ 14
Installation ......................................................................................... 15
Power supply ............................................................................ 15
Mounting the antenna............................................................... 15
Powering up the system ........................................................... 16
The front panel layout ........................................................................ 17
FAIL LED.................................................................................17
LOCK LED ............................................................................... 17
OCx LEDs................................................................................. 17
BNC connector DCF Out.......................................................... 17
BNC connector GPS Ant .......................................................... 17
Connectors Time code Out....................................................... 17
BSL Key ................................................................................... 18
Assignment of the terminal block............................................ 18
Assignment of the DSUB connectors ...................................... 19
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Replacing the lithium battery ............................................................ 19
CE label.............................................................................................. 19
Technical specifications GPS163TDHS............................................ 20
Technical specifications of antenna ......................................... 23
Assembly with CN-UB/E (CN-UB-280DC) ............................ 24
Format of the Meinberg standard time string.......................... 25
Format of the SAT time string................................................. 26
Format of the NMEA (RMC) string ........................................ 27
Format of the time string Uni Erlangen (NTP) ....................... 28
Diskette with Windows Software GPSMON32................................. 31
The program GPSMON32 ................................................................. 32
Online Help .............................................................................. 33
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General information
The satellite receiver clock GPS163TDHS has been designed to provide an extremly
precise time reference for the generation of programmable pulses and IRIG/AFNORcodes.
The clock has been developed for applications where conventional radio controlled
clocks can´t meet the growing requirements in precision. High precision available 24
hours a day around the whole world is the main feature of the system which receives its
information from the satellites of the Global Positioning System.
The Global Positioning System (GPS) is a satellite-based radio-positioning, navigation, and time-transfer system. It was installed by the United States Departement of
Defense and provides two levels of accuracy: The Standard Positioning Service (SPS)
and the Precise Positioning Service (PPS). While PPS is encrypted and only available for
authorized (military) users, SPS has been made available to the general public.
GPS is based on accurately measuring the propagation time of signals transmitted
from satellites to the user´s receiver. A nominal constellation of 21 satellites together with
3 active spares in six orbital planes 20000 km over ground provides a minimum of four
satellites to be in view 24 hours a day at every point of the globe. Four satellites need to
be received simultaneously if both receiver position (x, y, z) and receiver clock offset
from GPS system time must be computed. All the satellites are monitored by control
stations which determine the exact orbit parameters as well as the clock offset of the
satellites´ on-board atomic clocks. These parameters are uploaded to the satellites and
become part of a navigation message which is retransmitted by the satellites in order to
pass that information to the user´s receiver.
The high precision orbit parameters of a satellite are called ephemeris parameters
whereas a reduced precision subset of the ephemeris parameters is called a satellite´s
almanac. While ephemeris parameters must be evaluated to compute the receiver´s
position and clock offset, almanac parameters are used to check which satellites are in
view from a given receiver position at a given time. Each satellite transmits its own set of
ephemeris parameters and almanac parameters of all existing satellites.
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Block diagram GPS163TDHS
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tical isol ation
o
synchronization
3
GPS163TDHS
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clock
driver
RS232
(RS485)
program
memory
Flash EPROM
dual T x/Rx
program m able pu lses
enerator
timecode
Tx
PPS
data
addr/data
reference clock
microcontrollercorrelator
clock
addr/data
D/A-converter
clock
control
voltage
master
oscillator
sample
clock
data
clock
IF-circuit
SRAM
EEPROM
data memories
addr/data
real time clock
DCF-pulses
7
F
7
C
-
u
D
o
t
p
u
t
DCF77
simulation
C
antenna power
internal power
s
i
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l
m
a
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e
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9
-
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2
7
V
p
o
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e
r
power supply
GPS-signal (IF)
LO-frequency
tional
htnin
rotector
o
li
without additional amplifier
RG58-cable up to 250 met ers
unit
antenna/
converter
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Features of GPS163TDHS
The GPS163TDHS is designed for mounting on a DIN rail. The front panel integrates
five LED indicators, a hidden push button, an eight-pole terminal block, three female DSUB-9- and three BNC-connectors. The receiver is connected to the antenna/converter
unit by a 50 Ω-coaxial cable with length up to 250 m (if using RG58-cable). It is possible
to connect up to four receivers to one antenna by using an optional antenna diplexer.
The navigation message coming from the satellites is decoded by GPS163´s microprocessor in order to track the GPS system time with an accuracy of better than ±1 µsec.
Compensation of the RF signal´s propagation delay is done by automatical determination
of the receiver´s position on the globe. A correction value computed from the satellites´
navigation messages increases the accuracy of the onboard TCXO to ±5.10
-9
and
automatically compensates the oscillators aging. The last recent value is restored from the
battery-backed memory at power-up.
Time zone and daylight saving
GPS system time differs from the universal time scale (UTC) by the number of leap
seconds which have been inserted into the UTC time scale after GPS has been initiated in
1980. The current number of leap seconds is part of the navigation message supplied by
the satellites, so GPS163´s internal real time is based on UTC.
Conversion to local time including handling of daylight saving year by year can be
done by the receiver´s microprocessor if the corresponding parameters are set up with the
help of the software GPSMON32 (included Windows software).
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Pulse outputs
The pulse generator of the satellite controlled clock GPS163TDHS containes three
independant channels and is able to generate a multitude of different pulses, which are
configured with the software GPSMON32.
The active state of each channel is invertible, the pulse duration settable between
10 msec and 10 sec in steps of 10 msec.
In the default mode of operation the pulse outputs are disabled until the receiver
has synchronized after power-up. However, the system can be configured to enable
those outputs immediately after power-up.
The pulse outputs are electrically insulated by optocouplers (option: PhotoMOS
relays) and are available at the terminal block.
The following modes can be configured for each channel independently:
Timer mode: Three on- and off-times per day per channel programmable
Cyclic mode: Generation of periodically repeated pulses.
A cycle time of two seconds would generate a pulse at
0:00:00, 0:00:02, 0:00:04 etc.
DCF77-Simulation
mode: The corresponding output simulates the DCF77 time telegram.
The time marks are representing the local time as configured by the user.
Single Shot Mode: A single pulse of programmable length is generated once a day at a
programmable point of time
Per Sec.
Per Min.
Per Hr. modes: Pulses each second, minute or hour
Status: One of three status messages can be emitted:
‘position OK’: The output is switched on if the receiver was able to
compute its position
‘time sync’: The output is switched on if the internal timing is
synchronous to the GPS-system
‘all sync’: Logical AND of the above status messages.
The output is active if position is calculated AND the
timing is synchronized
Idle-mode: The output is inactive
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DCF77 emulation
The GPS163TDHS satellite controlled clock generates time marks which are compatible with the time marks spread by the German long wave transmitter DCF77. If
configured in GPSMON32, these time marks are available as pulse outputs. In
addition, an AM-modulated carrier frequency of 77.5kHz is available at a BNCconnector in the front panel. This signal can be used as a replacement for a DCF77antenna.
The long wave transmitter installed in Mainflingen near Frankfurt/Germany transmits the reference time of the Federal Republic of Germany: time of day, date of
month and day of week in BCD coded second pulses. Once every minute the complete
time information is transmitted. However, GPS163TDHS generates time marks
representing its local time as configured by the user, including announcement of
changes in daylight saving and announcement of leap seconds. The coding sheme is
given below:
P
8
3
M
4
Year of the Century
Month of Year
Day of Week
Day of Month
0
0
2
0
1
0
8
4
2
1
1
0
50
8
4
2
1
4
2
1
40
0
2
0
1
8
4
2
0
30
1
2
0
P
2
0
1
Hour
P
8
1
1
4
2
(reserved)
10
R
A
1
Z
1
Z
2
20
A
2
S
1
2
4
8
1
2
0
4
0
Minute
0
M Start of Minute (0.1 s)
R RF T ransmission via secondary ante nna
A1 Announcement of a ch ange in dayligh t saving
Z1, Z2 Time zone identification
Z1, Z2 = 0, 1: Daylight saving d isabled
Z1, Z2 = 1, 0: Daylight saving enabled
A2 Announcement of a lea p second
S Start of time code inf ormation
P1, P2, P3 Even parity bits
Time marks start at the beginning of new second. If a binary "0" is to be transmitted, the length of the corresponding time mark is 100 msec, if a binary "1" is
transmitted, the time mark has a length of 200 msec. The information on the current
date and time as well as some parity and status bits can be decoded from the time
marks of the 15th up to the 58th second every minute. The absence of any time mark
at the 59th second of a minute signals that a new minute will begin with the next time
mark.
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Asynchronous serial ports
Two asynchronous serial interfaces (RS-232) called COM0 and COM1 are available
to the user. In the default mode of operation, the serial outputs are disabled until the
receiver has synchronized after power-up. However, the system can be configured to
enable those outputs immediately after power-up. Transmission speeds, framings
and the kind of the time string can be configured separately. The serial ports are
sending a time string either once per second, once per minute or on request with
ASCII ´?´ only. The format of the output strings is ASCII, see the technical specifications for details. The corresponding parameters can be set up by GPSMON32 using
serial port COM0.
As an option the serial port COM1 is available as a RS485 interface.
IRIG-outputs
Introduction
The transmission of coded timing signals began to take on widespread importance
in the early 1950´s. Especially the US missile and space programs were the forces
behind the development of these time codes, which were used for the correlation of
data. The definition of time code formats was completely arbitrary and left to the
individual ideas of each design engineer. Hundreds of different time codes were
formed, some of which were standardized by the "Inter Range Instrumantation
Group" (IRIG) in the early 60´s. Detailed information about IRIG and other time
codes can be found in the "Handbook of Time Code Formats", by Datum Inc., 1363
South State College Boulevard, Anaheim, California 92806-5790.
Except these time codes other formats, like NASA36, XR3 or 2137, are still in use.
The module GPS163TDHS however generates IRIG-B or AFNOR NFS-500 only.
The selection of the generated timecode is done by the software GPSMON32.
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Av aila ble time codes
The timecode generator of the module GPS163TDHS is able to generate the timecodes shown below. The modulated codes (IRIG B122/B123, AFNOR, IEEE1344)
are available via the BNC-connector, the unmodulated codes (IRIG B002/B003 and
IEEE1344) via a DSUB connector in the front panel. The unmodulated codes are
available as a transistor output with internal pull up (1 kΩ to +5V), with TTL-level
into 50 Ω and with RS422 level.
B002: 100pps, DC Level Shift pulse width coded, no carrier
BCD time of year
B122: 100pps, amplitude modulated sine wave signal, 1 kHz carrier frequency
BCD time of year
B003: 100pps,DC Level Shift pulse width coded, no carrier
BCD time of year, SBS time of day
B123: 100pps, amplitude modulated sine wave signal, 1 kHz carrier frequency
BCD time of year, SBS time of day
AFNOR: 100pps, amplitude modulated sine wave signal, 1 kHz carrier frequency
BCD time of year, complete date, SBS time of day
output level adapted
IEEE1344: Code according to IEEE1344-1995
100pps, AM-Sine wave signal, 1kHz carrier frequency,
BCD-time of year, SBS time of day
IEEE1344 extensions for:
date, timezone, daylight-saving and leap second
in control functions ( CF ) segment.
also see table ‘Assignment of CF segment in IEEE1344 mode’
Code generation
The IRIG-code is available after the code-generation-unit of GPS163 has been
synchronized by a pulse per second and a serial time telegram. In the default mode of
operation the pulse outputs and the serial ports are disabled until the GPS-receiver
has been synchronized after power-up. The generation of the IRIG-code only starts
after synchronization therefore.
If the code must be available immediately after power-up, the software GPSMON32 can be used to enable the pulse outputs and the serial ports without synchronization of the GPS-receiver. In this mode of operation the IRIG-code is not locked to
UTC-second until synchronization.
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IRIG standard format
x 3x
IRIB-B : 1000 Hz
binary 0 binary 1
TYPICAL MODULATED CARRIER IRIG-A : 10000 Hz
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AFNOR time code format
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Assignment of CF Segment in IEEE1344 mode
Bit N o. D e signatio n Des c ription
49 Position Identifier P5
50 Year BCD encoded 1
51 Year BCD encoded 2
low nibble of BCD encoded year
52 Year BCD encoded 4
53 Year BCD encoded 8
54 empty, always zero
55 Year BCD encoded 10
56 Year BCD encoded 20
high nibb le of BC D e nc oded ye a r
57 Year BCD encoded 40
58 Year BCD encoded 80
59 P osition Identifier P6
60 LSP - Leap Second Pending set up to 59s before LS insertion
61 LS - Leap Second 0 = add leap second, 1 = delete leap second
62 DS P - D a ylight S a ving P e nding set up to 59 s b e fo r e d a ylight s aving cha ngeover
63 DS T - D a ylight S a ving Time se t d ur ing d a ylight s a ving t ime
64 Timezone Offset Sign sign of TZ offset 0 = '+', 1 = '- '
65 TZ Offset binary encoded 1
66 TZ Offset binary encoded 2
Offset from IRIG time to UTC time.
Encoded IRIG time plus TZ Offset equals UTC
67 TZ Offset binary encoded 4
at all times !
68 TZ Offset binary encoded 8
69 P osition Identifier P7
70 TZ Offse t 0.5 ho ur set if add itio na l ha lf hour o ffs e t
71 TFOM Time figure of merit
72 TFOM Time figure of merit
time figure of merit represents approximated
clock error.
2.)
0x00 = clock locked
73 TFOM Time figure of merit
0x0F = clock failed
74 TFOM Time figure of merit
1.)
75 PARITY parity on all preceding bits incl. IRIG-B time
1.)
current firmware does not support leap deletion of leap seconds
2.)
TFOM is cleared, when clo ck is synchronize d first after power up. see chapter Selection of generat ed t imecode
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Installation
Power supply
The module GPS163TDHS is designed for operation with a DC (19 V to 72 V, DCinsulation 1.5 kV) power supply. The voltage feed is done by using terminal blocks in
the frontpanel of the clock and should have low resistance to minimize spurious
emission (EMI).
To avoid potential differences between the signal ground of GPS163TDHS and
post-connected units installed on different DIN rails, the signal ground of the clock is
insulated from the case.
The case must be grounded by using the rear contact.
Mounting the antenna
The GPS satellites are not stationary but circle round the globe in a period of about 12
hours. They can only be received if no building is in the line-of-sight from the antenna to
the satellite, so the antenna/converter unit must be installed in a location from which as
much of the sky as possible can be seen. The best reception is given when the antenna
has a free view of 8° angular elevation above horizon. If this is not possible the antenna
should be installed with a mostly free view to the equator because of the satellite courses
which are located between latitudes of 55° North and 55° South. If even this is not
possible problems occure especially when at least four sattelites for positioning have to
be found.
The unit can be mounted using a pole with a diameter up to 60 mm. A standard coaxial
cable with 50 Ω impedance (e.g. RG58C) should be used to connect the antenna/
converter unit to the receiver. Cable thinner than RG58 should be avoided due to its
higher DC resistance and RF attenuation. When using the optional antenna diplexer the
total length of one antenna line between antenna, diplexer and receiver must not be
longer than 250 m. If a cable with less attenuation is used its length may be increased
accordingly (e.g. 500 m with RG213).
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Powering up the system
If both, the antenna and the power supply have been connected, the system is ready to
operate. About 10 seconds after power-up the receiver´s TCXO has warmed up and
operates with the required accuracy. If the receiver finds valid almanac and ephemeris data in its battery-backed memory and the receiver´s position has not changed
significantly since its last operation the receiver can find out which satellites are in
view now. Only a single satellite needs to be received to synchronize and generate
output pulses, so synchronization can be achieved maximally one minute after
power-up.
If the receiver position has changed by some hundred kilometers since last operation, the satellites´ real elevation and doppler might not match those values expected
by the receiver thus forcing the receiver to start scanning for satellites. This mode is
called Warm Boot because the receiver can obtain ID numbers of existing satellites
from the valid almanac. When the receiver has found four satellites in view it can
update its new position and switch to Normal Operation. If the almanac has been
lost because the battery had been disconnected the receiver has to scan for a satellite
and read in the current almanacs. This mode is called Cold Boot. It takes 12 minutes
until the new almanac is complete and the system switches to Warm Boot mode
scanning for other satellites.
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The front panel layout
FAIL LED
The FAIL LED is turned on whenever
the receiver is not synchronous to the
GPS-system.
LOCK LED
DCF Time cod e
Out Out
Lock
Fail
BSL
+
Ub
+
Oc 1
+
Oc 2
+
Oc 3
-
The LOCK LED is turned on if the
receiver has acquired at least four satellites and has computed its position
after power-up. In normal operation
GPS
Ant
GPS163TDHS COM 0 COM 1 Time code Out
the receiver position is updated continuously as long as at least four satellites can be received. When the receivers position is known and steady only, a single
satellite needs to be received for synchronization and generatation of output pulses.
OCx LEDs
The LEDs ‘OC1’, ‘OC2’ and ‘OC3’on the left of the terminal block are indicating the
status of the corresponding pulse output. A burning LED symbolizes the ON-state of
the optocoupler.
BNC connector DCF Out
The insulated AM-modulated carrier frequency is available at this connector.
BNC connector GPS Ant
The antenna/converter unit is connected to the receiver circuit of the GPS163 using
this connector.
Connectors Time code Out
The BNC-connector makes the modulated, the DSUB-connector the unmodulated
time codes available to the user.
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BSL Ke y
Whenever the on-board software must be upgraded or modified, the new firmware
can be downloaded to the internal flash memory using the serial port COM0. There is
no need to open the metal case and insert a new EPROM.
If the BSL key behind the front panel is pressed during operation, a bootstraploader is actived and waits for instructions from the serial port COM0. The new
firmware can be sent to GPS163 from any standard PC with serial interface. A loader
program will be shipped together with the file containing the image of the new
firmware.
The contents of the program memory will not be modified until the loader program
has sent the command to erase the flash memory. So, if the BSL key is pressed
unintentionally, the firmware will not be changed accidentially. After the next
power-up, the system will be ready to operate again.
Assignment of the terminal block
The pulse outputs are available at the terminal block in the front panel. In addition,
the power supply is connected to GPS163 using two poles of this terminal block. The
marking besides the terminal has the following meaning:
Pulse generator
GPS163x H S
Channel 1
Channel 2
Channel 3
+ Ub positive potential of power supply
- Ub reference potential of power supply
+ OCx Collector of photocoupler
- OCx Emitter of photocoupler
+
-
+
-
+
-
+
-
Ub
Oc 1
Oc 2
Oc 3
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Assignment of the DSUB connectors
The serial ports COM0 and COM1 and the unmodulated timecodes are available at
female D-SUB-9 connectors in the frontpanel. The RS-232 interfaces can be connected to a computer by using a standard modem cable. TxD describes the sending, RxD
the receiving line of GPS163TDHS.
Replacing the lithium battery
The life time of the lithium battery on the board is at least 10 years. If the need arises
to replace the battery, the following should be noted:
ATTENTION!
Danger of explosion in case of inadequate replacement
of the lithium battery. Only identical batteries or batte-
ries recommended by the manufacturer must be used for
replacement. The waste battery must be disposed as
proposed by the manufacturer of the battery.
CE label
This device conforms to the directive 89/336/EWG on the approximation of the laws of the Member States of the European Community relating to electromagnetc compatibility.
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Technical specifications GPS163TDHS
RECEIVER: 6 channel C/A code receiver with external
antenna/converter unit
ANTENNA: Antenna/converter unit with remote power supply
refer to chapter "Technical specifications of antenna"
ANTENNA
INPUT: Antenna circuit dc-insulated; dielectric strength: 1000 VDC
Length of cable: refer to chapter "Mounting the antenna"
TIME TO SYNCHRONIZATION: one minute with known receiver position and valid almanac
12 minutes if invalid battery-backed memory
BATTERY
BACKUP: storage of pulse configuration and important GPS-system data in
the internal RAM, backed-up by lithium battery
lifetime of battery 10 years min.
ACCURACY OF
INTERNAL
OSCILLATOR: after sync. and 20 min of operation ±5.10
during first 20 minutes of operation ±2.10
PULSE
OUTPUTS: three programmable outputs
insulation by optocouplers
U
pulse delay: t
CEmax
= 55 V, I
= 50 mA, P
Cmax
on
t
off
= 150 mW, V
tot
e.g. 20 µsec (IC = 10 mA)
e.g. 3 µsec (IC = 10mA)
Option: PhotoMOS-relay
U
= 400 V, I
max
= 150 mA, P
max
= 360 mW, V
tot
default settings: inactive
-9
-8
= 5000 V
iso
= 1500 V
iso
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ACCURACY OF
PULSES: better than ±1 µsec after synchronization and 20 minutes of
operation
better than ±3 µsec during the first 20 minutes of operation
SERIAL PORTS: 2 independant asynchronous serial ports
COM0 (RS-232)
Baud Rate: 300 up to 19200
Framing: 7N2, 7E1, 7E2, 8N1, 8N2, 8E1
COM1 (RS232, for internal use only)
Baud Rate: 300 up to 19200
Framing: 7E2, 8N1, 8O1, 8E1
time string selectable for COM0 and COM1
‘standard Meinberg’, ‘SAT’, ‘NMEA’ or ‘Uni Erlangen (NTP)’
default settings: COM0: 19200, 8N1
COM1: 9600, 8N1
‘Standard Meinberg’
time string per second
mode of operation ‘if sync’
TIME CODE
OUTPUTS: modulated via BNC-connector:
IRIG: 3VPP (MARK), 1VPP (SPACE) into 50 Ω
AFNOR: 2.17VPP (MARK), 0.69VPP (SPACE) into 600 Ω
modulated via DSUB-connector:
Field effect transistor with internal pull-up (1k Ω) to +5V
Data of transistor:
Uds
= 100 V, Id
max
= 150 mA, P
max
= 250 mW
max
TTL into 50 Ω
RS422
DCF77
EMULATION: AM-modulated 77.5 kHz carrier frequency
usable as replacement for a DCF77 antenna
output level approximately -55 dBm (unmodulated)
active after reset
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STATUS
INDICATION: receiver status:
Lock: the reciever was able to compute its position
after power-up
Fail: the receiver is asynchronous to the GPS-system
status of the pulse outputs:
a burning LED indicates the active state of the corresponding
optocoupler
POWER
REQUIREMENTS: 19-72 VDC, e.g. 3.6W
DC-insulation 1.5 KV
DIMENSION: 105 mm x 125.5 mm x 104 mm (H x B x T)
CONNECTORS: coaxial BNC connectors for antenna/converter unit, AM-modula-
ted DCF77 output and AM-modulated time code-output
female D-SUB-9 connectors for serial interfaces and unmodulated time code
terminal block for connection of pulse outputs and power supply
AMBIENT
TEMPERATURE: 0 ... 50°C
HUMIDITY: 85% max.
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Technical specifications of antenna
ANTENNA: dielectrical patch antenna, 25 x 25mm
receive frequency: 1575.42 MHz
bandwidth: 9 MHz
CONVERTER: loc al os cillator to converter frequency: 10 MHz
first IF frequency: 35.4 MHz
POWER
REQUIREMENTS: 12V ... 18V, @ 100mA (provided via antenna cable)
CONNECTOR: coax type N, female
AMBIENT
TEMPERATURE: -25 ... +65°C
HOUSING: ABS plastic case for outdoor installation (IP56)
PHYSICAL
DIMENSION:
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Assembly with CN-UB/E (CN-UB-280DC)
GPS167
Antenna
Type N
male
As short as possible!
1.5m max.
Type N
male
Type N
male
CN-UB/E
Type N / BNC
male
Meinberg
GPS
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Format of the Meinberg standard time string
The Meinberg standard time string is a sequence of 32 ASCII characters starting with
the STX (start-of-text) character and ending with the ETX (end-of-text) character.
The format is:
<STX>D:dd.mm.yy;T:w;U:hh.mm.ss;uvxy<ETX>
The letters printed in italics are replaced by ASCII numbers whereas the other characters
are part of the time string. The groups of characters as defined below:
<STX> Start-Of-Text (ASCII code 02h)
dd.mm.yy the current date:
dd day of month (01..31)
mm month (01..12)
yy year of the century (00..99)
w the day of the week (1..7, 1 = Monday)
hh.mm.ss the current time:
hh hours (00..23)
mm minutes (00..59)
ss seconds (00..59, or 60 while leap second)
uv clock status characters:
u: ‘#’ clock has not synchronized after reset
‘ ‘ (space, 20h) clock has synchronized after reset
v: different for DCF77 or GPS receivers:
‘*’ DCF77 clock currently runs on XTAL
GPS receiver has not checked its position
‘ ‘ (space, 20h) DCF77 clock is sync’d with transmitter
GPS receiver has determined its position
x time zone indicator:
‘U’ UTC Universal Time Coordinated, formerly GMT
‘ ‘ MEZ European Standard Time, daylight saving disabled
‘S’ MESZ European Summertime, daylight saving enabled
y anouncement of discontinuity of time, enabled during last hour
before discontinuity comes in effect:
‘! ’ announcement of start or end of daylight saving time
‘A’ announcement of leap second insertion
‘ ‘ (space, 20h) nothing announced
<ETX> End-Of-Text (ASCII code 03h)
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Format of the SAT time string
The SAT time string is a sequence of 29 ASCII characters starting with the STX
(start-of-text) character and ending with the ETX (end-of-text) character. The format
is:
<STX>tt.mm.jj/w/hh:mm:ssMEzzxy<CR><LF><ETX>
The letters printed in italics are replaced by ASCII numbers whereas the other characters
are part of the time string. The groups of characters as defined below:
<STX> Start-Of-Text (ASCII code 02h)
dd.mm.yy the current date:
dd day of month (01..31)
mm month (01..12)
yy year of the century (00..99)
w the day of the week (1..7, 1 = Monday)
hh:mm:ss the current time:
hh hours (00..23)
mm minutes (00..59)
ss seconds (00..59, or 60 while leap second)
zz time zone indicator:
‘Z ‘ MEZ European Standard Time, daylight saving disabled
‘SZ’ MESZ European Summertime, daylight saving enabled
x clock status characters:
‘*’ DCF77 clock currently runs on XTAL
GPS receiver has not checked its position
‘ ‘ (space, 20h) DCF77 clock is sync'd with transmitter
GPS receiver has determined its position
y anouncement of discontinuity of time, enabled during last hour
before discontinuity comes in effect:
‘! ’ announcement of start or end of daylight saving time
‘ ‘ (space, 20h) nothing announced
<CR> Carriage return (ASCII code 0Dh)
<LF> Line feed (ASCII code 0Ah)
<ETX> End-Of-Text (ASCII code 03h)
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Format of the NMEA (RMC) string
The NMEA String is a sequence of 65 ASCII characters starting with the ‘$’
character and ending with the characters CR (carriage return) and LF (line-feed). The
format is:
$GPRMC,hhmmss.ss,A,bbbb.bb,n,lllll.ll,e,0.0,0.0,ddmmyy,0.0,a*hh<CR><LF>
The letters printed in italics are replaced by ASCII numbers or letters whereas the
other characters are part of the time string. The groups of characters as defined
below:
$ start character (ASCII-Code 24h)
hhmmss.ss the current time:
hh hours (00..23)
mm minutes (00..59)
ss seconds (00..59, or 60 while leap second)
ss fractions of seconds (1/10 ; 1/100)
A Status (A = time data valid)
(V = time data not valid)
bbbb.bb latitude of receiver position in degrees
leading signs are replaced by a space character (20h)
n latitude, the following characters are possible:
‘N’ north of equator
‘S’ south d. equator
lllll.ll longitude of receiver position in degrees
leading signs are replaced by a space character (20h)
e longitude, the following characters are possible:
‘E’ east of Greenwich
‘W’ west of Greenwich
ddmmyy the current date:
dd day of month (01..31)
mm month (01..12)
yy year of the century (00..99)
a magnetic variation
hh checksum (EXOR over all characters except ‘$’ and ‘*’)
<CR> carriage-return; ASCII-Code 0Dh
<LF> line-feed; ASCII-Code 0Ah
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Format of the time string Uni Erlangen (NTP)
The time string Uni Erlangen (NTP) of a GPS-clock is a sequence of 66 ASCII
characters starting with the STX (start-of-text) character and ending with the ETX (endof-text) character. The format is:
<STX>tt.mm.jj; w; hh:mm:ss; voo:oo; acdfg i;bbb.bbbbn lll.lllle hhhhm<ETX>
The letters printed in italics are replaced by ASCII numbers whereas the other characters
are part of the time string. The groups of characters as defined below:
<STX> Start-Of-Text (ASCII code 02h)
dd.mm.yy the current date:
dd day of month (01..31)
mm month (01..12)
yy year of the century (00..99)
w the day of the week (1..7, 1 = Monday)
hh.mm.ss the current time:
hh hours (00..23)
mm minutes (00..59)
ss seconds (00..59, or 60 while leap second)
v sign of the offset of local timezone related to UTC
oo:oo offset of local timezone related to UTC in hours and minutes
ac clock status characters:
a: ‘#’ clock has not synchronized after reset
‘ ‘ (space, 20h) clock has synchronized after reset
c: ‘*’ GPS receiver has not checked its position
‘ ‘ (space, 20h) GPS receiver has determined its position
d time zone indicator:
‘S’ MESZ European Summertime, daylight saving enabled
‘ ‘ MEZ European Standard Time, daylight saving disabled
f anouncement of discontinuity of time, enabled during last hour
before discontinuity comes in effect:
‘! ’ announcement of start or end of daylight saving time
‘ ‘ (space, 20h) nothing announced
g anouncement of discontinuity of time, enabled during last hour
before discontinuity comes in effect:
‘A’ announcement of leap second insertion
‘ ‘ (space, 20h) nothing announced
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i leap second insertion
‘L’ leap second is actually inserted
(active only in 60th sec.)
‘ ‘ (space, 20h) no leap second is inserted
bbb.bbbb latitude of receiver position in degrees
leading signs are replaced by a space character (20h)
n latitude, the following characters are possible:
‘N’ north of equator
‘S’ south of equator
lll.llll longitude of receiver position in degrees
leading signs are replaced by a space character (20h)
e longitude, the following characters are possible:
‘E’ east of Greenwich
‘W’ west of Greenwich
hhhh altitude above sea level in meters
leading signs are replaced by a space character (20h)
<ETX> End-Of-Text (ASCII-code 03h)
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Diskette with Windows Software GPSMON32
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The program GPSMON32
The program GPSMON32 can be used to monitor and program all essential functions
of Meinberg GPS-Receivers. The Software is executable under Win9x/2k/NT. To install
GPSMON32 just run Setup.exe from the included diskette and follow the instructions
of the setup program.
To obtain a connection between your PC and the GPS-receiver, connect the receivers
COM0 port to a free serial port of your PC. The PCs comport used by the program
GPSMON32 can be selected in submenu 'PC-Comport' in menu 'Connection'.
Also transfer rate and framing used by the program are selected in this menu.
Communication between the clock and the PC comes about, only if the GPS serial
port is configured in the same way as the PCs comport. You can enforce an access, if
the GPS serial port is not configured with appropriate parameters for communication. Select the menu item 'Enforce Connection' in menu 'Connection' and click
'Start' in the appearing window. Some firmware versions of GPS167 do not support
this way of setting up a connection. If 'Enforce Connection' doesn't succeed
apparently, please change the serial port parameter of GPS COM0 manually to the
PCs parameters.
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Online Help
The online help can be started by clicking the menu item 'Help' in menu Help. In
every program window a direct access to a related help topic can be obtained by
pressing F1. The help language can be selected by clicking the menu items Deutsch/
Englisch in the Help Menu.
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