Meinberg GPS180SV User manual

MANUAL
GPS180SV
GPS Receiver Eurocard
21st June 2017
Meinberg Radio Clocks GmbH & Co. KG

Table of Contents
1 Imprint 1
2 General Information GPS 2
3 GPS180SV Features 3
3.1 TimeZoneandDaylightSaving ...................................... 3
3.2 PulseandFrequencyOutputs ....................................... 3
3.3 TimeCaptureInputs ............................................. 3
3.4 Asynchronous Serial Ports (optional 4x COM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.5 DCF77Emulation .............................................. 4
3.6 Programmablepulse ............................................. 4
3.7 TimeCode(Option) ............................................. 5
3.7.1 AbstractofTimeCode ....................................... 5
3.7.2 BlockDiagramTimeCode ..................................... 5
3.7.3 IRIGStandardFormat ....................................... 6
3.7.4 AFNORStandardFormat ..................................... 7
3.7.5 Assignment of CF Segment in IEEE1344 Code . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.7.6 GeneratedTimeCodes ....................................... 9
3.7.7 Selection of Generated Time Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.7.8 Outputs................................................ 10
3.7.9 TechnicalData............................................ 10
4 Installation 11
4.1 TheFrontPanelLayout........................................... 11
4.2 RS232COM0................................................. 11
4.3 MountingtheGPSAntenna ........................................ 12
4.3.1 Example: ............................................... 12
4.3.2 Antenna Assembly with Surge Voltage Protection . . . . . . . . . . . . . . . . . . . . . . . 13
4.4 PowerSupply................................................. 14
4.5 PoweringUptheSystem .......................................... 14
5 Safety Instructions 15
5.1 Skilled/Service-Personnel only: Replacing the Lithium Battery . . . . . . . . . . . . . . . . . . . . 15
6 Technical Specifications GPS180SV 16
6.1 Technical Specifications GPS Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7 The program GPSMON32 21
7.1 SerialConnection............................................... 21
7.2 NetworkConnection ............................................. 21
7.3 OnlineHelp.................................................. 22
Date: 21st June 2017 GPS180SV

1 Imprint
1 Imprint
Meinberg Funkuhren GmbH & Co. KG
Lange Wand 9, 31812 Bad Pyrmont / Germany
Phone: + 49 (0) 52 81 / 93 09 - 0
Fax: + 49 (0) 52 81 / 93 09 - 30
Internet: http://www.meinberg.de
Mail: [email protected]
Date: 2014-08-21
GPS180SV Date: 21st June 2017 1

2 General Information GPS
The satellite receiver clock GPS180SV has been designed to provide extremly precise time to its user. 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 this 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 24 satellites together with several 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 pre-
cision 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.
2 Date: 21st June 2017 GPS180SV

3 GPS180SV Features
3 GPS180SV Features
The GPS180SV is using the "Standard Positioning Service" SPS. Navigation messages coming in from the
satellites are decoded by the GPS180SV microprocessor in order to track the GPS system time. Compensa-
tion of the RF signal´s propagation delay is done by automatic determination of the receiver´s geographical
position. A correction value computed from the satellites´ navigation messages increases the accuracy of the
board´s oven controlled master oscillator (OCXO) and automatically compensates the OCXO´s aging. The last
state of this value is restored from the battery buffered memory at power-up.
The GPS180SV has several different optional outputs, including four progammable pulses, modulated / un-
modulated timecode and max. four RS232 COM ports, depending on the hardware configuation. Additionally,
you can get the GPS180SV with different oscillators (e.g. OCXO- LQ/SQ/MQ/HQ/DHQ or Rubidium) to cover
all levels of accuracy requirements.
You can review and change the hard- and software configuration options of the clock with the GPSMON32
application(see corresponding section in this manual).
3.1 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 since GPS was initiated in 1980. The current number of leap seconds is
part of the navigation message supplied by the satellites, so the internal real time of the GPS180SV is based
on UTC time scale. Conversion to local time and annual daylight saving time can be done by the receiver’s
microprocessor if the corresponding parameters are set up by the user.
3.2 Pulse and Frequency Outputs
The pulse generator of GPS180 generates pulses once per second (P_SEC) and once per minute (P_MIN).
Additionally, master frequencies of 10 MHz, 1 MHz and 100 kHz are derived from the OCXO. All the pulses are
available with TTL level at the rear connector.
Frequency Outputs (optional)
The included synthesizer generates a frequency from 1/8 Hz up to 10 MHz synchronous to the internal timing
frame. The phase of this output can be shifted from -360◦to +360◦for frequencies less than 10 kHz. Both
frequency and phase can be setup from the front panel or using the serial port COM0. Synthesizer output is
available at the rear connector as sine-wave output (F_SYNTH_SIN), with TTL level (F_SYNTH) and via an
open drain output (F_SYNTH_OD). The open drain output can be used to drive an optocoupler when a low
frequency is generated.
In the default mode of operation, pulse outputs and the synthesizer output are disabled until the receiver
has synchronized after power-up. However, the system can be configured to enable those outputs immedi-
ately after power-up. An additional TTL output (TIME_SYN) reflects the state of synchronization. This output
switches to TTL HIGH level when synchronization has been achieved and returns to TTL LOW level if not a
single satellite can be received or the receiver is forced to another mode of operation by the user.
3.3 Time Capture Inputs
Two time capture inputs called User Capture 0 and 1 are provided at the rear connector (CAP0 and CAP1) to
measure asynchronous time events. A falling TTL slope at one of these inputs lets the microprocessor save the
current real time in its capture buffer. From the buffer, capture events are transmitted via COM0 or COM1 and
displayed on LCD. The capture buffer can hold more than 500 events, so either a burst of events with intervals
down to less than 1.5 msec can be recorded or a continuous stream of events at a lower rate depending on the
GPS180SV Date: 21st June 2017 3

transmission speed of COM0 or COM1 can be measured.
The format of the output string is ASCII, see the technical specifications at the end of this document for
details. If the capture buffer is full a message "** capture buffer full" is transmitted, if the interval between two
captures is too short the warning "** capture overrun" is being sent.
3.4 Asynchronous Serial Ports (optional 4x COM)
Four asynchronous serial RS232 interfaces (COM0 ... COM3) 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 mode of operation can be configured separately using the setup menu. COM0 is compatible with other
radio remote clocks made by Meinberg. It sends the time string either once per second, once per minute or on
request with ASCII ´?´ only. Also the interfaces can be configured to transmit capture data either automatically
when available or on request. The format of the output strings is ASCII, see the technical specifications at the
end of this document for details. A separate document with programming instructions can be requested defining
a binary data format which can be used to exchange parameters with GPS180 via COM0.
3.5 DCF77 Emulation
The clock generates TTL level time marks (active HIGH) which are compatible with the time marks spread by
the German long wave transmitter DCF77. This long wave transmitter installed in Mainflingen near Frank-
furt/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, the generates time marks representing its local time as configured by the user, including announce-
ment of changes in daylight saving and announcement of leap seconds. The coding sheme is given below:
M Start of Minute (0.1 s)
R RF Transmission via secondary antenna
A1 Announcement of a change in daylight saving
Z1, Z2 Time zone identification
Z1, Z2 = 0, 1: Daylight saving disabled
Z1, Z2 = 1, 0: Daylight saving enabled
A2 Announcement of a leap second
S Start of time code information
P1, P2, P3 Even parity bits
0
10
20
30
40
50
R
M
1
4
2
1
20
10
8
4
2
1
P2
02
01
8
4
2
1
2
4
8
10
1
2
4
8
10
20
40
80
3
P
A1
Z1
Z2
A2
S
1
2
4
8
10
20
40
1P
Minute
(reserved)
Hour
Day of Month
Day of Week
Year of the Century
Month of Year
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. The DCF emulation output is enabled
immediately after power-up.
3.6 Programmable pulse
At the male connector Typ VG96 there are four programmable TTL outputs (Prog Pulse 0-3), which are arbitrarily
programmable.
4 Date: 21st June 2017 GPS180SV

3 GPS180SV Features
3.7 Time Code (Option)
3.7.1 Abstract of Time Code
The transmission of coded timing signals began to take on widespread importance in the early 1950´s. Espe-
cially 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 Instrumentation Group" (IRIG) in the early 60´s.
Except these "IRIG Time Codes", other formats like NASA36, XR3 or 2137 are still in use. The board GPS180
however generates the IRIG-B, AFNOR NFS 87-500 code as well as IEEE1344 code which is an IRIG-B123
coded extended by information for time zone, leap second and date. Other formats may be available on request.
A modulated IRIG-B (3 Vpp into 50W) and an unmodulated DC level shift IRIG-B (TTL) signal are available at
the VG64 male connector of the module.
3.7.2 Block Diagram Time Code
modulated time code modulated time code hgh active and low active
driver
50 Ω unbalanced
driver
TTL
D/A converter
modulator
digital
sinewave
generator
microcontroller
time code
EPLD
10 MHz
PPS
GPS180SV Date: 21st June 2017 5

3.7.3 IRIG Standard Format
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3 GPS180SV Features
3.7.4 AFNOR Standard Format
GPS180SV Date: 21st June 2017 7

3.7.5 Assignment of CF Segment in IEEE1344 Code
Bit No. Designation Description
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 nibble of BCD encoded year
57 Year BCD encoded 40
58 Year BCD encoded 80
59 Position 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 1.)
62 DSP - Daylight Saving Pending set up to 59s before daylight saving changeover
63 DST - Daylight Saving Time set during daylight saving time
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.
67 TZ Offset binary encoded 4 Encoded IRIG time plus TZ Offset equals UTC at all times!
68 TZ Offset binary encoded 8
69 Position Identifier P7
70 TZ Offset 0.5 hour set if additional half hour offset
71 TFOM Time figure of merit
72 TFOM Time figure of merit time figure of merit represents approximated clock error. 2.)
73 TFOM Time figure of merit 0x00 = clock locked, 0x0F = clock failed
74 TFOM Time figure of merit
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 clock is synchronized first after power up. see chapter Selection of generated
timecode
8 Date: 21st June 2017 GPS180SV

3 GPS180SV Features
3.7.6 Generated Time Codes
Besides the amplitude modulated sine wave signal, the board also provides unmodulated
DC-Level Shift TTL output in parallel. Thus six time codes are available.
a) B002: 100 pps, DCLS signal, no carrier
BCD time-of-year
b) B122: 100 pps, AM sine wave signal, 1 kHz carrier frequency
BCD time-of-year
c) B003: 100 pps, DCLS signal, no carrier
BCD time-of-year, SBS time-of-day
d) B123: 100 pps, AM sine wave signal, 1 kHz carrier frequency
BCD time-of-year, SBS time-of-day
e) B006: 100 pps, DCLS Signal, no carrier
BCD time-of-year, Year
f) B126: 100 pps, AM sine wave signal, 1 kHz carrier frequency
BCD time-of-year, Year
g) B007: 100 pps, DCLS Signal, no carrier
BCD time-of-year, Year, SBS time-of-day
h) B127: 100 pps, AM sine wave signal, 1 kHz carrier frequency
BCD time-of-year, Year, SBS time-of-day
i) AFNOR: Code according to NFS-87500, 100 pps, wave signal,
1kHz carrier frequency, BCD time-of-year, complete date,
SBS time-of-day, Signal level according to NFS-87500
j) IEEE1344: Code according to IEEE1344-1995, 100 pps, 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’)
k) C37.118 Like IEEE1344 - with turned sign bit for UTC-Offset
GPS180SV Date: 21st June 2017 9

3.7.7 Selection of Generated Time Code
The time code to be generated can be selected by Menu Setup IRIG-settings or the Monitorprogram GPSMON32
(except Lantime models). DC-Level Shift Codes (PWM-signal) B00x and modulated sine wave carrier B12x are
always generated simultaneously. Both signals are provided at the VG64-Connector, i.e. if code B132 is se-
lected also code B002 is available. This applies for the codes AFNOR NFS 87-500 and IEEE1344 as well.
The TFOM field in IEEE1344 code is set dependent on the ’already sync’ed’ character (’#’) which is sent
in the serial time telegram. This character is set, whenever the preconnected clock was not able to synchronize
after power up reset. The ’time figure of merit’ (TFOM) field is set as follows.
Clock synchronized once after power up: TFOM = 0000
Clock not synchronized after power up: TFOM = 1111
For testing purposes the output of TFOM in IEEE1344 mode can be disabled. The segment is set to all zeros
then.
3.7.8 Outputs
The module GPS180 provides modulated (AM) and unmodulated (DCLS) outputs. The format of the timecodes
is illustrated in the diagramms "IRIG-" and "AFNOR standard-format".
AM - Sine Wave Output
The carrier frequency depends on the code and has a value of 1 kHz (IRIG-B). The signal amplitude is 3 Vpp
(MARK) and 1 Vpp (SPACE) into 50 Ohm. The encoding is made by the number of MARK-amplitudes during
ten carrier waves. The following agreements are valid:
a) binary "0": 2 MARK-amplitudes, 8 SPACE-amplitudes
b) binary "1": 5 MARK-amplitudes, 5 SPACE-amplitudes
c) position-identifier: 8 MARK-amplitudes, 2 SPACE-amplitudes
PWM DC Output
The pulse width DCLS signals shown in the diagramms "IRIG" and "AFNOR standard format" are coexistent to
the modulated output and is available at the VG connector pin 13a with TTL level.
3.7.9 Technical Data
Outputs: Unbalanced AM-sine wave-signal:
3 Vpp (MARK) / 1 Vpp (SPACE) into 50 Ohm
DCLS signal: TTL
10 Date: 21st June 2017 GPS180SV

4 Installation
4 Installation
4.1 The Front Panel Layout
GPS180SV
Freq.
Lock
Ant.
Fail
C
16
59
O
M
Freq. LED
blue: Initialisation phase
green: "warmed up" - oscillator is adjusted
off: Oscillator not adjusted yet
Lock LED
green: positioning complete
Ant. LED
red: no synchronization resp. no antenna connected
or short circuit on the antenna line
green: antenna connected and clock is synchronized
Fail LED
red: no synchronization
4.2 RS232 COM0
3
5
2
RS232
COM0
GND
TxD0
RxD0
The serial port COM0 is accessible via a 9pin DSUB
male connector in the frontpanel of the GPS180, par-
allel hardwired to the COM0 port on the rear VG edge
connector.
GPS180SV Date: 21st June 2017 11

4.3 Mounting the GPS Antenna
The GPS satellites are not stationary, but circle round the globe with 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/downconverter
unit must be installed in a location that has as clear a view of the sky as possible. The best reception is
achieved when the antenna has a free view of 8◦angular elevation above the horizon. If this is not possible, the
antenna should be installed with the clearest free view to the equator, because the satellite orbits are located
between latitudes 55◦North and 55◦South. If this is not possible, you may experience difficulty receiving the
four satellites necessary to complete the receiver’s position solution.
The antenna/converter unit can be mounted on a wall, or on a pole up to 60 mm in diameter. A 50 cm
plastic tube, two wall-mount brackets, and clamps for pole mounting are included. A standard RG58 coaxial
cable should be used to connect the antenna/downconverter unit to the receiver. The maximum length of cable
between antenna and receiver depends on the attenuation factor of the coaxial cable.
Up to four GPS180SV receivers can be run with one antenna/downconverter unit by using an optional an-
tenna splitter. The total length of an antenna line from antenna to receiver must not be longer than the max.
length shown in the table below. The position of the splitter in the antenna line does not matter.
The optional delivered MBG S-PRO protection kit can also be used for outdoor installation (degree of pro-
tection: IP55). However, we recommend an indoor installation, as short as possible after wall entering of the
antenna cable, to minimize the risk of overvoltage damage by lightning for example.
4.3.1 Example:
Type of cable diameter Ø Attenuation at 100MHz max lenght.
[mm] [dB]/100m [m]
RG58/CU 5mm 17 300 (1)
RG213 10.5mm 7 700 (1)
(1)This specifications are made for antenna/converter units produced after January, 2005
The values are typically ones; the exact ones are to find out from the data sheet of the used cable
12 Date: 21st June 2017 GPS180SV

4 Installation
4.3.2 Antenna Assembly with Surge Voltage Protection
Optional a surge voltage protector for coaxial lines is available. The shield has to be connected to earth as
short as possible by using the included mounting bracket. Normally you connect the antenna converter directly
with the antenna cable to the system.
GPS Antenna
free view to the sky!
Cable Slot
N-Norm female
N-Norm male
N-Norm male
N-Norm female
N-Norm female
N-Norm male Meinberg GPS
N-Norm male female
or BNC male female
as short as possible
Ground lead to PE rail
(Protective Earth)
Cable ca. 1,5 mm Ø
fastened at the surge protector
GPS180SV Date: 21st June 2017 13

4.4 Power Supply
The power supply used with a GPS180 has to provide only one output of +5V. The output voltage should be
well regulated because drifting supply voltages reduce the short time accuracy of the generated frequencies
and timing pulses. The power supply lines should have low resistance and must be connected using both pins
a, b and c of the rear connector.
4.5 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 (OCXO-LQ) until 3 minutes (OCXO-MQ / HQ) has warmed up and operates with
the required accuracy. If the receiver finds valid almanac and ephemeris data in its battery buffered 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 (OCXO-LQ) until 10 minutes
(OCXO-MQ / HQ) . After 20 minutes of operation the OCXO is full adjusted and the generated frequencies are
within the specified tolerances.
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 discon-
nected 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.
In the default mode of operation, neither pulse and synthesizer outputs nor the serial ports will be enabled after
power-up until synchronization has been achieved. However, it is possible to configure some or all of those
outputs to be enabled immediately after power-up. If the system starts up in a new environment (e. g. receiver
position has changed or new power supply) it can take some minutes until the OCXO´s output frequency has
been adjusted. Up to that time accuracy of frequency drops to 10-8 reducing the accuracy of pulses to +-5µs.
14 Date: 21st June 2017 GPS180SV

5 Safety Instructions
5 Safety Instructions
5.1 Skilled/Service-Personnel only: 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,
following should be noted:
ATTENTION!
Danger of explosion in case of inadequate replacement
of the lithium battery. Only identical batteries or bat-
teries recommended by the manufacturer must be used
for replacement. The waste battery must be disposed
as proposed by the manufacturer of the battery.
GPS180SV Date: 21st June 2017 15

6 Technical Specifications GPS180SV
Receiver: 12 - 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"
Power Supply 15 V DC, continuous short circuit protection, automatic recovery
for Antenna: isolation voltage 1000 VDC, provided via antenna cable
Antenna Input: antenna circuit dc-insulated; dielectric strength: 1000V
length of cable: refer to chapter "Mounting the Antenna
Time to one minute with known receiver position and valid almanac
Sychronization: 12 minutes if invalid battery buffered memory
Pulse Outputs: change of second (P_SEC, TTL level)
change of minute (P_MIN, TTL level)
Accuracy after synchronization and 20 minutes of operation
of Pulses: TCXO, OCXO LQ: better than +-100 nsec
OCXO SQ/MQ/HQ: better than +-50 nsec
OCXO DHQ, Rubidium:better than +-50 nsec
better than +-2 µsec during the first 20 minutes of operation
Frequency
Outputs: 10 MHz, TTL level into 50 Ohm
1 MHz, TTL level
100 kHz, TTL level
Frequency
Synthesizer: 1/8 Hz up to 10 MHz
Accuracy of
Synthesizer: base accuracy depends on system accuracy
1/8 Hz to 10 kHz Phase syncron with pulse output P_SEC
10 kHz to 10 MHz frequency deviation < 0.0047 Hz
Synthesizer
Outputs: F_SYNTH: TTL level
F_SYNTH_OD: open drain
drain voltage: < 100 V
sink current to GND: < 100 mA
dissipation power at 25◦C:< 360 mW
F_SYNTH_SIN: sine-wave
output voltage: 1.5 V eff.
output impedance: 200 Ohm
Time_Syn Output: TTL HIGH level if synchronized
Time Capture triggered on falling TTL slope
Inputs: Interval of events: 1.5msec min., Resolution: 100ns
16 Date: 21st June 2017 GPS180SV

6 Technical Specifications GPS180SV
Serial Ports: 2 asynchronous serial ports RS-232 (optional max. 4 serial ports)
Baud Rate: 300, 600, 1200, 2400, 4800, 9600, 19200 Baud
Framing: 7E1, 7E2, 7N2, 7O1, 7O2, 8E1, 8N1, 8N2, 8O1
default setting:
COM0: 19200, 8N1
Meinberg Standard time string, per second
COM1: 9600, 8N1
Capture string, automatically
Time Code Outputs: Unbalanced modulated sine wave signal:
3Vpp (MARK), 1Vpp (SPACE) into 50 ohm
DCLS-signal: TTL into 50 ohm, active-high or -low
Power Requirements: +5 V +-5%, max. 1,2 A
Ambient Temp.: 0 ... 50◦C
Humidity: 85% max.
GPS180SV Date: 21st June 2017 17