DEWESOFT V21-1 Guide de l'administrateur
Use GPS for Timing
and Synchronization
How-to Guide
GPS module V21-1
1
Use GPS for Timing and Synchronization
How-to Guide
1. Table of contents
1. Table of contents 2
2. GPS settings 3
2.1 1Hz internal GPS 3
2.2 20 Hz internal GPS 4
2.3 100 Hz internal GPS 5
2.4 DS-GPS-SYNC 5
3. Sync port setting 6
4. Timing setting 7
5. Measurement 7
6. Example configurations 8
About this document 10
Legend 10
Warranty information 10
Calibration 10
Support 11
Service/repair 11
Restricted Rights 11
Printing History 11
Copyright 11
Trademarks 11
Safety instructions 11
Safety symbols in the manual 12
General Safety Instructions 12
Environmental Considerations 12
Product End-of-Life Handling 12
System and Components Recycling 12
General safety and hazard warnings for all Dewesoft systems 13
Documentation version history 15
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Use GPS for Timing and Synchronization
How-to Guide
In the graphic above you see independent measurement systems, synchronised per GPS. Basically
the DEWESoft device needs the PPS (pulse per second) output from the GPS, to correctly synchronize
the AD clock to it. Also a single system can use the GPS time as a timebase for the measurement.
Either internal GPS (DEWE-101, S-BOX) or external GPS (DS-GPS-SYNC) can be used.
This document lists first the different GPS (depending if 1 Hz, 20 Hz or 100 Hz option, internal or
external GPS), then the sync port and timing setup is described.
2. GPS settings
If you already have a DEWE-101 (Minitaur) or S-BOX with integrated GPS, you need to check the correct
GPS setting in DEWESoft first (should be correctly setup by delivery). Go to Settings -> Hardware setup
-> GPS. Depending on the used GPS type one of the following settings will work:
2.1 1Hz internal GPS
For the 1 Hz GPS option the following Init String must be entered in hardware setup to correctly setup
the PPS output. Enable the checkbox "Send init string", then copy line by line sequentially into the text
field.
$PRTHS,U1OP,ALL=0,GGA=1,GSV=1,RMC=1
$PRTHS,PPSG,ENABLE
$PRTHS,PPSO,0,0,500000000
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Use GPS for Timing and Synchronization
How-to Guide
2.2 20 Hz internal GPS
For 20 Hz GPS select the Topcon/Javad device (higher update rates are selectable but cannot be
applied).
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Use GPS for Timing and Synchronization
How-to Guide
2.3 100 Hz internal GPS
Also for 100 Hz GPS select the Topcon/Javad device.
2.4 DS-GPS-SYNC
For the clocking of single slices or a DEWE-43, use the DS-GPS-SYNC kit available at DEWESoft, which
consists of an external GPS (with PPS out functionality), which you just need to connect; all the cabling is
already done.
Connect the Dsub9 to the CAN port, the GPS mouse will be powered from the (often not used) CAN port.
The 00 Lemo cable is connected to the Sync connector for the TTL PPS signal. The serial communication
to the GPS is done over USB by using an additional RS232-to USB converter (included in the set).
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Use GPS for Timing and Synchronization
How-to Guide
Install the driver for the RS232-to-USB converter (you can find it also on the USB Stick included in the
shipment, in the folder „\Extras\USB-to-Serial_Converter“)
Sometimes it happens that the mouse cursor starts jumping after the GPS is connected (this is
depending on your Windows version); to fix it please follow these steps:
●As soon as the Mouse pointer starts jumping disconnect the DSUB RS232 connection between
the GPS and the USB converter (but do not disconnect the USB converter!)
●Enter the Windows device manager (right-click on Computer, choose “manage” and select
device manager)
●In the list of devices go to “Mice and other pointing devices”, right-click on “Microsoft serial
ballpoint” and choose “deactivate” (do not choose deinstall!)
Then go to the hardware setup and select NMEA compatible GPS, the correct COM port the driver is
using and a baud rate of 4800.
3. Sync port setting
Go to Settings -> Hardware-Setup -> Analog -> and select „DEWESoft USB“; Your DEWESoft device will
be automatically found; the Sync-mode should be set to „Standalone“.
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Use GPS for Timing and Synchronization
How-to Guide
4. Timing setting
Select the „Timing“ tab, choose „DEWESoft USB“ for the timing device and „GPS“ as the time source:
5. Measurement
Exit the Hardware-Setup with OK, go back to Channel Setup – GPS screen and check if the GPS has
found several satellites, shows the coordinates and “PPS sync” is green:
Go to measure mode, the green button on top shows that the synchronisation works ok.
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Use GPS for Timing and Synchronization
How-to Guide
Starting from DEWESoft X2 it is possible to import data from independent measurement
stations into ONE datafile. When the datafiles have the same time stamping (synchronised
measurement), you just import and DEWESoft aligns them correctly.
See next chapter for example configurations.
6. Example configurations
Directly synching to external GPS is working using 1 Dewesoft device. If you use e.g. 2 separate SIRIUS
slices, synched by sync cable, the sync port is already in use for the internal synchronisation between the
slices. Therefore the DS-CLOCK has to be used to convert the GPS signal to IRIG.
Using the internal GPS of a “multislice” device for timing (SBOX + multiple SIRIUS slices in one
aluminium chassis) works because the connections are done internally.
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How-to Guide
GPS module V21-1 9/15
Use GPS for Timing and Synchronization
How-to Guide
About this document
This is the users manual for ___________________ _ _ module.
Legend
The following symbols and formats will be used throughout the document.
Important
It gives you important information about the subject.
Please read carefully!
Hint
It gives you a hint or provides additional information about a subject.
Example
Gives you an example of a specific subject.
Warranty information
Notice
The information contained in this document is subject to change without notice.
Note:
Dewesoft d.o.o. shall not be liable for any errors contained in this document. Dewesoft MAKES NO
WARRANTIES OF ANY KIND WITH REGARD TO THIS DOCUMENT, WHETHER EXPRESS OR IMPLIED.
DEWESOFT SPECIFICALLY DISCLAIMS THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR A PARTICULAR PURPOSE. Dewesoft shall not be liable for any direct, indirect, special, incidental, or
consequential damages, whether based on contract, tort, or any other legal theory, in connection with
the furnishing of this document or the use of the information in this document.
The copy of the specific warranty terms applicable to your Dewesoft product and replacement parts can
be obtained from your local sales and service office. To find a local dealer for your country, please visit
https://dewesoft.com/support/distributors.
Calibration
Every instrument needs to be calibrated at regular intervals. The standard norm across nearly every
industry is annual calibration. Before your Dewesoft data acquisition system is delivered, it is calibrated.
Detailed calibration reports for your Dewesoft system can be requested. We retain them for at least one
year, after system delivery.
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4
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