Sercel MRU Manuale utente
MRU
User's Manual
Software version 2.0
Documentation Part No. 0311355 Issue : January 2002
WARNING
As it incorporates a radio frequency transmitter, the MRU is subject to
regulations specific to each country concerning frequency allocation on
Radio Frequency bands.
It is for the user to take the necessary steps for any authorization that may be
required in his or her country prior to implementing MRU units.
(See transmission specifications in Appendix 7).
In no event shall SERCEL be liable for incidental or consequential damages or
related expenses resulting from the use of this product, or arising out of or
related to this manual or the information contained in it, even if SERCEL has
been advised, or knew or should have known of the possibility of such damages.
The information in this manual is believed to be accurate and reliable. However,
SERCEL reserves the right to make changes to its products or specifications at
any time, without notice, in order to improve design or performance and to
supply the best possible product.
Introduction
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1 INTRODUCTION
The vehicle tracking system illustrated by the block diagram below is
based on the use of SERCEL MRU units. An MRU is a special transceiver
performing the following functions :
- When configured for use in a vehicle to be tracked the MRU provides a
radio link that allows the vehicle to transmit its position and status to
the base station and receive messages from it. The vehicle’s position is
supplied by a radiopositioning receiver via a traditional serial port to the
MRU. The status is generated by an alarm button on the MRU.
- When configured for use at a base station the MRU provides a radio
link for the station to receive position messages from tracked vehicles
and to transmit text messages and destination waypoints to the vehi-
cles. Communications between the MRU and the station are on a
traditional serial port.
Position + Alarm
Waypoint
+
Service
Messages
Central
Station
MRU
P
osition + Alarm
Service
Messages
Monitoring
Station (optional)
MRU
GPS MRU
GPS MRU
GPS MRU
Introduction
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1-2
The MRU is configured by simply connecting one of its serial port to a
PC computer and running a configuration program.
A typical application is one for SN388 seismic data acquisition system
users, consisting of implementing an MRU network to track a seismic crew's
service vehicles : the central base station is implemented in the recording
truck (called Lab in the MRU terminology), and a monitoring base station is
implemented at the survey Camp.
At any of the base stations central station and monitoring station if
any, equipped with vehicle tracking software from SERCEL the position of
each tracked vehicle appears in a graphic window showing the map of the
area of interest. The trackline of the vehicles can be recorded and viewed too.
Configuring an MRU network
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2 CONFIGURING AN MRU NETWORK
2-1 INTRODUCTION
In this step, you only need to specify the following parameters to
configure your vehicle tracking system.
- UHF frequency channel (the same for all the units)
- A registration number for each vehicle (from 1 to 50)
- A refresh rate (10, 30 or 60 seconds; the same rate for all vehicles).
- Choosing a master MRU to be the sync master. This should be an MRU
equipped with a high-accuracy master oscillator. The sticker on the rear
panel of the MRU tells you whether it is a Master MRU (i.e. equipped
with a high-accuracy M.O.) or a Slave MRU (with a standard M.O.).
Other parameters are required to implement the data transmission
scheme (see Appendices 1 and 3) but they don’t need to be user-specified. In
particular, the following parameters are software-set :
Sync slot No. : 01
Format : 10
Frame : 300
Subframe : = (refresh rate / 10) ×50
Rank in subframe : =(vehicle registration number-1) ×(refresh rate/10)+1.
Configuring an MRU network
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2 - 2 CONFIGURING MRUS FROM A PC COMPUTER
• Connections required
MRU
Port ADiskette
MRU-PC RS232C cable
(part No. 1A17075074)
Port A
Labelled
«MRU Software
Setup»
• Content of the «MRU Software Setup» diskette (part No. 1A17075136)
BASE.BAT Command file intended for «base »MRU (i.e. MRUs
installed in central or monitoring station)
BASE.12 Configuration file intended for base MRU not used as the
sync master
BASE_MST.12 Configuration file intended for base MRU used as the
sync master
MOBILE.BAT Command file intended for mobile MRU
MOBILE.12 Configuration file intended for mobile MRU
MRU.EXE Program file used when running BASE.BAT or
MOBILE.BAT
Configuring an MRU network
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• Configuration procedure
Now that your MRU is connected to a PC as indicated in the previous
paragraph, do the following :
- Insert the diskette into drive A
- Select the A drive
- Type in one of the following commands depending on whether the
attached MRU is intended to be used at the central or monitoring station
(« base »MRU) or in a mobile (mobile MRU).
base<sp>[channum]<sp>camp{<sp>master}Base MRU
(monitoring station)
base<sp>[channum]<sp>lab{<sp>master}Base MRU
(central station)
mobile<sp>[channum]<sp>[regnum]<sp>[refresh rate]Mobile MRU
Where :
[channum]: UHF frequency channel number (0 to 5600,
depending on the country ; 4000 to 5600 for the
USA)
[regnum]: Mobile registration number (1 to 50)
[refresh rate]: (10, 30 or 60 seconds)
{master}: Optional parameter, configures a MASTER MRU as
sync master. A single MRU should be defined as
the sync master.
Conventions used in the syntax above :
[..]: Square brackets enclose parameter definition which
should be replaced by the desired value in the
command line
{...}: Braces enclose optional parameter
<sp> : Space character required
Square brackets and braces should not be typed in
the command line.
Getting help from the setup program :
Simply type in base or mobile to display the
syntax of the commands, as described above.
Configuring an MRU network
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• Examples
A:\>base 4900 camp
Configures the MRU as the unit to be used at the monitoring station and
operating on freq. Channel # 4900
A:\>base 4900 lab master
Configures the MRU as the unit to be used at the central station and
operating on freq. Channel # 4900. The MRU is also configured to be
the sync master.
A:\>mobile 4900 10 10
Configures the MRU as mobile #10 operating on freq. Channel # 4900.
Refresh rate: 10 seconds
As the MRU is being configured, the configuration commands are
reported on the screen.
After sending each command to the MRU, the PC queries the MRU by
sending the same command with no parameters. As a result the MRU returns
the command and parameters it has just received, (without leading zeroes) as
shown in the example below.
# FIFO length
PC -> MRU : CONST 0200, 0000 (Command from the PC to the
MRU)
PC -> MRU : CONST (Query from the PC to the MRU)
MRU -> PC : CONST 200, 0 (Reply from the MRU to the PC)
Each reply should agree with the corresponding command (except for
leading zeroes), or else the MRU will not work properly.
In case of any discrepancy between a command and the associated
reply (e.g. as a result of communications errors) perform the configuration
procedure again.
Configuring an MRU network
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• Finishing off
After the configuring process is complete, the "A :\>" DOS prompt re-
appears on the PC screen.
You can disconnect the MRU and then repeat the configuration step
with another MRU that you first connect to the PC. Repeat this operation until
the whole network of MRUs is configured.
2-3 CONFIGURING MRUS FROM A UNIX WORKSTATION
After the MRU software is installed on a workstation (see Appendix 5)
you can use the workstation instead of a PC to configure MRUs.
NOTE for SN388 users only : for an SN388 HCI workstation, see
Appendix 4.
•Connections required
MRU
2
5C connector
Port A
Port A
Workstation
MRU-Workstation cable
part No. 1A17075075
•Configuration procedure
In a Shell window, type one of the following commands depending on
whether the attached MRU is intended to be used at the central or
monitoring station (“base “MRU), or in a mobile (mobile MRU).
mru -b<sp>[channum]<sp>camp{<sp>master}Base MRU
(monitoring
station)
mru -b<sp>[channum]<sp>lab{<sp>master}Base MRU
(central station)
mru -m<sp>[channum]<sp>[regnum]<sp>[refresh rate]Mobile MRU
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The syntax is the same as with a PC. See par. 2-2 above for a
description of the procedure and parameters.
Examples :
mru -b 4900 camp
mru -b 4900 Lab master
mru -m 4900 10 10
Indice
