Vaisala MRG112 Use and care manual

GPS Processor
MRG112
TECHNICAL
REFERENCE
M210642EN-B
August 2005

PUBLISHED BY
Vaisala Oyj Phone (int.): [phone]
P.O. Box 26 Fax: [phone]
FIN-00421 Helsinki
Finland
Visit our Internet pages at http://www.vaisala.com/
© Vaisala 2005
No part of this manual may be reproduced in any form or by any means,
electronic or mechanical (including photocopying), nor may its contents be
communicated to a third party without prior written permission of the copyright
holder.
The contents are subject to change without prior notice.
Please observe that this manual does not create any legally binding obligations for
Vaisala towards the customer or end user. All legally binding commitments and
agreements are included exclusively in the applicable supply contract or
Conditions of Sale.

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VAISALA ________________________________________________________________________ 1
Table of Contents
CHAPTER 1
GENERAL INFORMATION............................................................................ 3
About This Manual ................................................................... 3
Contents of This Manual ....................................................... 3
Feedback............................................................................... 4
Safety......................................................................................... 4
General Safety Considerations ............................................. 4
ESD Protection...................................................................... 4
Technical Support .................................................................... 5
CHAPTER 2
PRODUCT OVERVIEW.................................................................................. 7
Introduction to GPS Processor MRG112 ............................... 7
CHAPTER 3
FUNCTIONAL DESCRIPTION....................................................................... 9
GPS Module and Connections................................................ 9
Programmable Logic Device................................................. 10
Serial Line Switch................................................................... 10
LED Lamp Operation.............................................................. 11
Reset Operation...................................................................... 12
Back-up Power ....................................................................... 12
CHAPTER 4
PARTS LIST ................................................................................................. 13
CHAPTER 5
DIAGRAMS AND BOARD LAYOUTS......................................................... 15
CHAPTER 6
TECHNICAL DATA ...................................................................................... 19
Signal Inputs........................................................................... 19
GPS Receiver Module......................................................... 19
General................................................................................ 20
APPENDIX A
CONNECTOR SIGNAL LAYOUT ................................................................ 21
APPENDIX B

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CONNECTOR SIGNAL LIST........................................................................23
APPENDIX C
FRONT PANEL CONNECTORS..................................................................25
COM1 Connector ....................................................................25
GPS ANT Connector...............................................................25
APPENDIX D
LIST OF SIGNALS .......................................................................................27

Chapter 1 ________________________________________________________ General Information
VAISALA ________________________________________________________________________ 3
CHAPTER 1
GENERAL INFORMATION
This chapter provides general notes for the product.
About This Manual
This manual provides information for installing, operating, and
maintaining the GPS Processor MRG112.
Contents of This Manual
This manual consists of the following chapters:
- Chapter 1, General Information, provides general notes for the
product.
- Chapter 2, Product Overview, introduces the GPS Processor
MRG112 features.
- Chapter 3, Functional Description, covers the connections and
operation of MRG112.
- Chapter 4, Parts List, contains a list of the MRG112 parts.
- Chapter 5, Diagrams and Board Layouts, lists the diagrams and
board layouts.
- Chapter 6, Technical Data, contains the MRG112 technical
specifications.
- Appendix A, Connector Signal Layout.
- Appendix B, Connector Signal List.
- Appendix C, Front Panel Connectors.
- Appendix D, List of Signals.

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Feedback
Vaisala Customer Documentation Team welcomes your comments
and suggestions on the quality and usefulness of this publication. If
you find errors or have other suggestions for improvement, please
indicate the chapter, section, and page number. You can send
comments to us by e-mail: [email protected]
Safety
General Safety Considerations
Throughout the manual, important safety considerations are
highlighted as follows:
NOTE Note highlights important information on using the product.
ESD Protection
Electrostatic Discharge (ESD) can cause immediate or latent damage
to electronic circuits. Vaisala products are adequately protected
against ESD for their intended use. However, it is possible to damage
the product by delivering electrostatic discharges when touching,
removing, or inserting any objects inside the equipment housing.
To make sure you are not delivering high static voltages yourself:
- Handle ESD sensitive components on a properly grounded and
protected ESD workbench. When this is not possible, ground
yourself to the equipment chassis before touching the boards.
Ground yourself with a wrist strap and a resistive connection cord.
When neither of the above is possible, touch a conductive part of
the equipment chassis with your other hand before touching the
boards.
- Always hold the boards by the edges and avoid touching the
component contacts.

Chapter 1 ________________________________________________________ General Information
VAISALA ________________________________________________________________________ 5
Technical Support
For technical questions, contact the Vaisala technical support:
E-mail [email protected]
Phone (int.) [phone]
Fax [phone]

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Chapter 2 __________________________________________________________ Product Overview
VAISALA ________________________________________________________________________ 7
CHAPTER 2
PRODUCT OVERVIEW
This chapter introduces the GPS Processor MRG112 features.
Introduction to GPS Processor MRG112
The GPS Processor MRG112 is a plug-in E1-size Eurocard unit. It is
used to add GPS based wind finding capability to the sounding
system. It contains an Eurocard Base Unit and a GPS Module, which
is installed on the Base Unit. The signal from local GPS antenna is
connected via Base Unit to the GPS Module. Two serial data channels
are provided for external communication.
The GPS Module is a commercial GPS Navigation Unit. It is used for
receiving satellite orbital data, synchronizing with GPS time,
extracting local receiver position and velocity and for receiving local
GPS signals to be used in the differential wind calculation.
The Base Unit is an E1 size card, which contains system connector,
front plate and installation place, and connectors for GPS Module. The
local antenna connector and two status LED lamps are locating in the
front plate. Back-up power capacitor for GPS Module and an
automatic line switch are also locating in the base unit.
The automatic serial line switch is provided for main serial channel.
The switch enables the MRG112 to be used in parallel with optional
external GPS receiver using the same communication channel. At
power-up the MRG112 monitors the line voltage levels and does not
connect into the line if an active external device is present.

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Chapter 3 ______________________________________________________ Functional Description
VAISALA ________________________________________________________________________ 9
CHAPTER 3
FUNCTIONAL DESCRIPTION
This chapter covers the connections and operation of MRG112.
GPS Module and Connections
The GPS module is an independent GPS receiver for local channel
L1-band GPS signals. The module is installed on the main board of
the MRG112.
The local signal is connected from local GPS antenna to the module
via the front panel Local Ant. connector (X4) by using coaxial
cabling. The current limited supply voltage +4.8 V is connected via
the Module to the Low-Noise-Amplifier of the Local Antenna. The
RF signal and the supply voltage share the same path.
The GPS module has two serial communication channels (A and B).
The channel A is used for communication with the Control Processor
and to send GPS data. Channel A (TXD1M, RXD1M) is connected to
the system connector X1 via line switch A2. Channel B can be used to
connect external data sources directly to the Module. Channel B
(TXD2, RXD2M) is connected to the front panel connector COM1
and to the system connector. The output signal TXD2 is connected to
the front panel and to the system connector in parallel. The input
signals RXD2A and RXD2B are connected via logical OR connection
in PLD D1 to the GPS Module.
The reset input MANRES# is provided for full initialization of the
Module. The signal is controlled by PLD D1 and it is activated when
MRES# (X1/c37) is active low or output A1/2 is active high.
The time reference output signal 1PPS (one-pulse-per-second ) is
provided by the Module. The signal has one-second period and its

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rising edge is synchronized to the GPS time. The duration of the high
state of the pulse is from 1 to 2 milliseconds. The 1PPS signal is
connected via D1 and buffer D2 to the system connector X1.
Programmable Logic Device
The programmable logic device (PLD) D1 is used to control the reset
function, the LED lamps, and the serial channel connections in the
unit.
The PLD is factory programmed via programming interface consisting
of signals TDI, TDO, TCK, and TMS.
The inverter gate D3-A is connected as oscillator and it supplies a
150 kHz clock signal for D1.
Serial Line Switch
The serial channel 1 from system connector (TXD1, RXD1) is
connected to the GPS module channel A (TXD1M, RXD1M) via
analog switch A2. The A2 consists of four separate switches, each
switch is controlled by PLD and a switch is closed if corresponding
control input G1, G2, G3 or G4 is at high level.
Switch 1 is used to connect the transmit signal TXD1M via buffer
amplifier A3-A to the serial line TXD1. Switch 2 and amplifier A3-B
are for possible future use.
Switch 3 is used to connect the TXD1 line signal to the line voltage
detector, which consists of transistors V1, V2, and diodes V3, V6. The
detector output at V1 collector is at high level if the line voltage is
below -3 V and the output is connected to the PLD for line switch
control.
Switch 4 is used to connect the receive signal RXD1 to the GPS
module.
After power-up or reset switches 1, 2, 4 are open and switch 3 is
closed to allow the line voltage detector to monitor the TXD1 line.
According to the detector output the PLD logic determines the line
status as "idle" or "externally driven" at 200 ms intervals. The status is
'externally driven' if the line voltage was below -3 V for more than 5%

Chapter 3 ______________________________________________________ Functional Description
VAISALA _______________________________________________________________________ 11
of the time in the preceding 200 ms period, otherwise the status is
determined as idle.
The current line status is used to lock the switch controls at the time
when the first rising edge is received in RXD1 line at D1/20. Switches
1, 2, and 4 are left open if the line status is "externally driven". In this
case the system uses external receiver and MRG112 is left
unconnected. In the opposite case switches are closed and system
starts communicate with MRG112. Switch 3 is always opened at the
time of switch locking. The locked switch settings are permanent until
next power-up or reset.
The analog switch A2 is of a fault-protected type, where voltage levels
at the protected side pins (3,14,11,6) can exceed the operating
voltages up to +/- 36 V. When operating voltage is exceeded the
protected right side pin enters a protective high impedance state and if
the switch is closed the left side pin connects corresponding operating
voltage level to the pin with a current of up to 10 mA.
LED Lamp Operation
The bicolor STATUS LED lamp V4 shows the status of MRG112
unit. It is controlled by signals STLRED# and STLGRN# . The lamp
is red (STLRED# = 0), green (STLGRN# = 0), yellow (STLRED#
=0, STLGRN# = 0) or dark (both controls inactive).
During active reset V4 is yellow, after reset the lamp is flashing green
until serial line switch is set for external or internal operation. Internal
operation is indicated by solid green and external operation is
indicated by yellow.
The bicolor SVs (Satellite Vehicles) LED lamp V7 indicates the
operation of the GPS Processor. It is controlled by signals SVLRED#
and SVLGRN# . The lamp is red (SVLRED# = 0), green (SVLGRN#
= 0), yellow (SVLRED# =0, SVLGRN# = 0) or dark (both controls
inactive).
During active reset V7 is yellow, after reset the lamp is controlled
directly by signals REDLED and GRNLED from GPS Module, only
the red color is converted as yellow in PLD. The yellow flashing
indicates that the GPS Module is operating and the number of green
flashes between yellow ones are indicating the satellites tracked by
GPS Module. If serial line switch is set for external operation the V4
lamp color is set as solid yellow.

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Reset Operation
The master reset signal MRES# from system connector and internal
reset from voltage monitor A1 are connected to the PLD. Internal reset
signal is active if the level of +5 V operating voltage is below 4.65 V.
Both reset signals are combined in PLD and unit reset in MRG112 is
activated if either one input is active.
Back-up Power
The Module uses +5 V operating voltage and in addition the back-up
power +VB is provided for the non-volatile memory of the Module.
The back-up power is supplied by a large capacitor C1, which is
charged to approximately +4.2 V from +5 V operating voltage or from
optional stand-by voltage +VSTBY via diodes V5, V10 and V11. The
resistors R18- R20 are for current limiting and the zener diode V9 is
for clamping the maximum capacitor voltage to approximately
+4.2 V.
The typical back-up time with fully charged capacitor is 48 hours and
the time can be made unlimited by using optional +VSTBY supply.

Chapter 4 _________________________________________________________________Parts List
VAISALA _______________________________________________________________________ 13
CHAPTER 4
PARTS LIST
This chapter contains a list of the MRG112 parts.
Table 1 Special Parts
Reference Part Number Description
Assembly ref. 1 DRW214479 Front Panel
Assembly ref. 2 6014 Tapped Spacer
Assembly ref. 3 16166 "Type" Sticker
Assembly ref. 4 MW45027 Coaxial Cable
Assembly ref. 5 MW45100 Isolation Sheet
Assembly ref. 6 25143 GPS Receiver Module
Assembly ref. 7 26158 Hexagon Tapped Spacer
Assembly ref. 8 10948 "Static Sensitive" Sticker
Assembly ref. 9 15223 "Serial No" Sticker
Table 2 Integrated Circuits
Reference Part Number Description
D1 25771 IC, EPLD, EPM7064STC44-10
D2 26570 IC, Buffer Tiny, NC7SZ125M5
D3 15964 IC, Inverter, 74HC14, SO14
A1 19483 IC, Supervisor, MAX810L
A2 26119 IC, Analog Switch, MAX4512ESE
A3 16730 IC, Op. Amp., TL082 ID, SO8
Table 3 Transistors and Diodes
Reference Part Number Description
V1, 2 15495 Transistor, NPN, SST3904
V4, 7 010192 Diode, Tricolor LED, 591-3001
V3, 5, 10, 11 16004 Diode, Schottky, MBR0540T1
V13 17332 Diode, Transil, P6SMB6.8AT3
V8, 12 17311 Diode, Transil, SM6T30CA
V5 16587 Diode, Zener, RLZ5230B

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Table 4 Resistors
Reference Part Number Description
R7, 8, 12, 13, 16,
17, 24, 25
26100 Resistor, Chip, 100R 1.0% 100ppm
0603
R18-23, 41 15304 Resistor, Chip, 100R 1.0% 50ppm
1206
R1-6,9, 14, 15 25263 Resistor, Chip, 1k0 1.0% 100ppm
0603
R10, 11, 26-40,
42, 43
25262 Resistor, Chip, 10K 1.0% 100ppm
0603
Table 5 Capacitors
Reference Part Number Description
C5 18524 Cap., Chip Ceramic, 1n 5% NPO 50V
0805
C2-4, 6, 7 19941 Cap., Chip Ceramic, 100n 10% X7R
16V 0603
C8 25560 Cap., Chip Tantalum, 100uF 16V 20%
Case E
C1 18269 Cap., Electolytic, 1F 5.5V,
DB5R5D105
Table 6 Connectors
Reference Part Number Description
TP1, TP2 0172 Connector Pin, E-309/6
X1 210249 Connector, 2 mm Metric,
Ermet104732
X2 25056 Connector, D, DEJK9P4-1A7N
X3 26106 Connector, Socket, HLE-115-02-G-DV
X4 18323 Connector, SMA, 34 SMA-50-0-3
Table 7 Miscellaneous
Reference Part Number Description
211738 Screw, Crosshead, M2.5x6, DIN7985
PZ A4
212017 Screw, Crosshead, M2.5x5, DIN7985
PZ A4
6779 Nut, Hexagon, M2.5, DIN934 A4
7067 Washer, Spring, B2.5, DIN127 A4
5068 Screw-Lock Compound, Loctite 222
PCB210356 FR-4 1.6mm 2-Layer

Chapter 5 _________________________________________________ Diagrams and Board Layouts
VAISALA _______________________________________________________________________ 15
CHAPTER 5
DIAGRAMS AND BOARD LAYOUTS
This chapter lists the diagrams and board layouts.
Table 8 List of Diagrams
Description Picture Code
GPS Processor MRG112 Circuit Diagram DRW218338
GPS Processor MRG112 Components
Layout
DRW218395

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0409-017
Figure 1 GPS Processor MRG112 Circuit Diagram

Chapter 5 _________________________________________________ Diagrams and Board Layouts
VAISALA _______________________________________________________________________ 17
0409-018
Figure 2 GPS Processor MRG112 Components Layout

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