Navman GPS Receiver LA000507 User Manual

Jupiter 20  
GPS receiver module  
Development kit guide  
Applies only to older models:  
TU10-D007-400  
TU10-D007-401  
TU10-D007-402  
Related products  
• Jupiter 20 (standard)  
TU20-D411-001  
• Jupiter 20 S (high sensitivity)  
TU20-D411-101  
• Jupiter 20 D (dead reckoning)  
TU20-D421-201  
Related documents  
• Jupiter 20 Product brief LA000509  
• Jupiter 20 Data sheet LA000507  
• Jupiter 20 DR Application note LA000433  
• Jupiter 30/20 Integrator’s manual LA000577  
• SiRF Binary Protocol reference manual  
MN000314  
• NMEA reference manual MN000315  
• SiRFDemo and SiRFflash user guides  
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Figures  
Tables  
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1.0 Introduction  
The TU10-D007-400 series of Development kits assist in the integration of either the standard  
or DR version of the Jupiter 20 into a customer’s application, offering an easy to use platform  
for evaluation purposes. This document provides detailed guidelines for the operation and  
configuration of the Jupiter 20 GPS reciever module Development kit.  
Note: before supplying power to the Development Unit, carefully review the configuration  
settings outlined in section 3.0. Also, familiarise yourself with the main functional switches  
and connectors on the Development Unit’s front and rear panels and with the operating  
instructions described in this document for optimum receiver performance.  
2.0 Equipment  
This section provides a brief overview of the equipment included in the Development kit.  
2.1 Equipment supplied  
This kit should contain the items illustrated in Figure 2-1.  
(2)  
(6)  
(1)  
DC Power  
9-16Volts  
Serial Port 1  
Serial Port 2  
-
+
Antenna  
DR  
Clock  
Out  
(4)  
(5)  
(3)  
software and documentation  
Figure 2-1 Equipment supplied in the Jupiter 20 GPS Development kit  
1. Jupiter 20 GPS Development Unit  
The Jupiter 20 GPS receiver Development Unit includes all of the following hardware to allow  
thorough evaluation:  
• Dual RS232 level serial data I/O ports  
• Selectable bias voltages for active GPS antennas  
• Backup power source for SRAM and RTC  
• Provision to insert a current measuring device to monitor both primary and backup power  
usage under various conditions  
• Regulated DC power supply to the Jupiter 20 module  
• Status indication through four LEDs on front panel  
• Configurable functionality using a DIP switch accessed through the front panel  
2. GPS antenna with pre-amp, magnetic base and SMA connector  
A magnetic-mount active antenna is supplied along with an RF cable (RG-316) already  
terminated with the proper connector for the Development Unit. The nominal measured  
attenuation of the cable with connectors is approximately 5 dB. The supplied active antenna  
should be biased at +3 VDC, but a different active antenna with a bias of either +3, +5 or  
+12 VDC may be used. Refer to section 3.2 to ensure that the configuration switches on the front  
panel of the Development Unit are set to select the appropriate bias voltage.  
Caution: ensure antenna power switches are properly set before connecting the antenna. An  
antenna designed for +3 VDC operation will be damaged if connected to a +12 VDC  
source.  
3. Serial interface cable  
A serial cable is provided to interface between the Development Unit and a PC, or between  
the Development Unit and a DGPS receiver. This cable is terminated at both ends with female  
connectors to match the male connectors on the Development Unit and the PC. If the PC only  
supports a USB port, an RS232/USB converter could be used.  
4. Power adapter for 240/120 VAC operation  
DC power for the Development Unit is provided by an AC/DC converter or automobile adapter.  
The AC/DC converter operates from nominal 120/240VAC input and gives 12VDC at 500mA out.  
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5. Power adapter for 12 VDC vehicle operation  
For mobile operation, an automotive adapter intended for use in 12VDC vehicles is provided.  
6. Software and documentation CD  
The CD contains Jupiter 20 GPS receiver documentation and other information on how to  
use GPS receivers. SiRFDemo and SiRFflash analysis software are also provided to allow  
communication with the Jupiter 20 GPS receiver through a serial port. This Windows based  
software presents the receiver’s raw data in a geographical form, allowing both detailed analysis  
and evaluation for both NMEA and SiRF Binary formats.  
2.2 Equipment required  
The following equipment is also required to evaluate the Jupiter 20 receiver.  
• IBM compatible PC  
• Minimum one serial port (If your PC only has USB, a USB/RS232 converter can be  
employed)  
• Windows 95/98, WinNT4.0 or higher  
• 486 100MHz or higher  
• SVGA at least 800x600 resolution  
• 16 Megabytes of RAM  
• 6 Megabytes (min) of disk space  
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3.0 Technical configuration  
This section provides a detailed description of all the technical aspects and configurable  
functionality of the Jupiter 20 GPS Development Unit.  
3.1 Overview  
Figure 3-1 illustrates the connectors, switches and LEDs available on the Development Unit.  
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1
2
3
4
5
6
7
8
CTS  
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function LEDs  
reset switch  
power switch  
configuration switch  
‘U’ slot for antenna  
SMA antenna  
cable (custom)  
connector  
DC Power  
9-16Volts  
Serial Port 1  
Serial Port 2  
-
+
Antenna  
DR  
Clock  
Out  
1PPS output  
dead reckoning  
input signals  
comm 1  
NMEA & binary  
comm 2  
(RTCM)  
DC input J1  
Figure 3-1 Front and back panels of the Jupiter 20 development unit  
3.1.1 Power switch (ON/OFF)  
The switch on the front panel controls primary power to the Jupiter 20 receiver module inside.  
The power status LED (see section 3.3) indicates status: if lit, the module has primary power  
supplied. If the configuration DIP switch 5 is on and Jumper JB5/6 linked, the module’s  
secondary supply SRAM and RTC will continue to be powered when the power switch is off.  
Only removal of the DC power input at the rear of the unit will stop secondary power being  
applied (assuming Jumper JB5/6 and switch 5 are correctly set). Having this secondary power  
supply applied means that the Jupiter 20 will have a ‘hot start’ capability when primary power is  
re-applied within 4 hours, and a ‘warm start’ thereafter, by maintaining last position, current time  
and satellite ephemerides.  
3.1.2 Configuration DIP switch  
The configuration DIP switch on the front panel provides the ability to configure the Jupiter  
20 module, offering flexibility depending on the specific application. Refer to section 3.2 for  
a description of the functionality of each individual switch, including the typical settings when  
using the Jupiter 20 module.  
3.1.3 Function LEDs  
The four LEDs on the front panel indicate the current status of basic features associated with  
the Development Unit. Refer to section 3.3 for a description of the function of each LED.  
3.1.4 Reset switch  
A reset push button is provided on the front panel to generate a receiver system hardware reset.  
3.1.5 Clock out connector  
The Clock out connector, located on the rear panel of the Development Unit, can be used to  
provide module generated timing signals. Refer to section 3.4 for more detailed information.  
3.1.6 Serial port 1  
This host serial port is used to send and receive serial data. This port is used as the default, with  
transmission in NMEA format at the rate of 9600 Baud. Use 9-pin D-subminiature connectors  
with these serial ports.  
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3.1.7 Serial port 2  
This is the auxiliary serial port, primarily used for the reception of RTCM SC-104 DGPS  
(Differential GPS) correction messages.  
3.1.8 DR connector  
The DR connector is used to interface with a gyroscope, wheel tick pulses and forward/reverse  
indicator when using a Jupiter 20 DR module. Refer to section 3.5 for more information.  
3.1.9 Antenna connector  
The antenna provided with this Development kit should be connected to the SMA connector  
located on the rear panel of the Development Unit.  
3.1.10 DC power input  
The supplied DC power adapter should be plugged into the DC connector on the rear panel of  
Development Unit. The Development Unit will accept voltages from 9 to 16 VDC. The middle pin  
on J1 is negative polarity, while the outer shell is positive.  
3.2 Configuration DIP switch  
A typical setting of the Configuration DIP switch is shown in Figure 3-2.  
1 2 3 4 5 6 7 8  
ON  
OFF  
Figure 3-2 Configuration DIP switch  
Table 3-1 outlines the available functionality and corresponding switch position for the  
Configuration DIP switch.  
Switch  
Description  
GPIO3/GYROIN*  
Typical setting  
OFF (high)  
1
2
3
4
5
6
7
8
GPIO15/FR*  
OFF (high)  
Serial BOOT  
OFF (normal run)  
OFF (high)  
GPIO1/W_TICKS*  
RTC BACKUP POWER  
PREAMP power select  
PREAMP power select  
PREAMP power enable  
ON (enabled)  
OFF (3 V)  
OFF (12 V)  
ON (enabled)  
* These functions have been disabled by internal switch SW3 to allow correct operation of  
the antenna current sense circuits on the Jupiter 20 adapter board.  
Table 3-1 DIP switch settings  
A brief description of the functionality of each switch is specified below. Refer to the Jupiter 20  
Data sheet for more information about the functionality of specific pads. The receiver  
operating settings will not change after moving the position of a configuration switch while the  
Development Unit is operating. Pressing the reset switch, or turning the unit OFF and ON will  
enable the settings to take effect in the receiver. The recommended method for reconfiguration  
is to switch the unit OFF, modify the switch positions, then re-apply the power.  
3.2.1 DIP switch 1 – GPIO3 /GYROIN input  
DIP switch 1 interfaces with the GPIO3 /GYROIN pad of the module. The switch is typically  
OFF, but has no effect with the standard module’s software. This switch can be enabled by the  
internal switch SW3.1.  
3.2.2 DIP switch 2 – GPIO15 /FR input  
DIP switch 2 interfaces with the GPIO15 /FR pad of the module. The switch is typically OFF, but  
has no effect with the standard module’s software. This switch can be enabled by the internal  
switch SW3.2.  
3.2.3 DIP switch 3 – BOOT from serial mode  
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DIP switch 3 interfaces with the BOOT pad of the module and allows the user to upgrade the  
Flash memory. For normal operation the switch should be set to OFF. To boot from the serial  
port the switch should be set to ON. This switch is enabled by the internal switch SW3.3.  
3.2.4 DIP switch 4 – GPIO1/W_TICKS input  
DIP switch 4 interfaces to the GPIO1/W_TICKS pad of the module. The switch is typically  
OFF, but has no effect with the standard module’s software. This switch can be enabled by the  
internal switch SW3.4.  
3.2.5 DIP switch 5 – RTC backup power enable  
DIP switch 5 provides control of the RTC backup power to the module. When set to the ON  
position, the RTC backup power is applied to the module, allowing the RTC and SRAM to  
continue being powered when the primary source is removed. The jumper JB5/6 must also be  
in place for the backup power to be supplied. This power supply will be supplied to the module  
even with the main power switch in the OFFposition.  
3.2.6 DIP switch 6 – Antenna preamp power select (3.3 V or 5/12 V)  
DIP switch 6 provides control of the antenna preamp voltage applied to the module. The  
position of the switch determines the supply voltage (OFF = 3.3 V, ON = 5/12 V). The positions  
of switches 7 and 8 also need to be considered when using the preamp function.  
Note: the supplied antenna is a 3.3 V type.  
3.2.7 DIP switch 7 – Antenna preamp power select (5 V or 12 V)  
DIP switch 7 also controls the antenna preamp voltage applied to the module. If switch 6 is ON,  
then switch 7 will determine the supply voltage to the active antenna (OFF = 12 V, ON = 5 V).  
3.2.8 DIP switch 8 – Antenna preamp power enable  
DIP switch 8 provides the ability to enable/disable the antenna preamp voltage to the module  
depending on the antenna being used. Typically this switch is ON, enabling 3 V to be applied to  
the active antenna supplied with the kit.  
3.3 Function LEDs  
There are four LEDs on the front panel of the Development Unit, indicating the status of a  
selection of basic functions. The functions of the LEDs are described in the sections that follow.  
1PPS  
Power  
AUX  
GPIO  
Figure 3-3 Function LEDs on front panel  
Note that some early versions of the Development unit have different LED legends.  
3.3.1 1PPS  
This LED will flash ON with each transition of the 1 PPS (Pulse Per Second) output of the GPS  
receiver. The 1PPS LED will begin flashing when the receiver is tracking a satellite.  
3.3.2 Power  
This LED indicates presence of primary DC power to the module.  
3.3.3 AUX  
This LED shows activity on the auxiliary serial RS232 port (DGPS).  
3.3.4 GPIO  
This LED indicates the state of GPIO15 , which can be set via DIP switch 2. This LED is lit  
when switch 2 is set to ON. (Note that switch 2 has no effect when using standard Jupiter 20  
software.)  
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3.4 Clock out connector  
The Clock out connector provides an interface for all associated timing signals with the module.  
It provides the user access to the Time Mark (1PPS) signal. The pinout connections are  
described in Table 3-2, and illustrated in Figure 3-4.  
Pin number  
Function  
not used  
1
2
3
4
inverted 1PPS signal  
normal 1PPS signal  
ground  
Table 3-2 Pin functions of the clock out connector  
4
3
2
1
Figure 3-4 Pin layout of the clock out connector  
A mating connector for the clock out connector is supplied with the Development kit. The part  
number is shown in Table 3-3.  
Manufacturer  
Part number  
Molex  
70400 series ‘G’  
Table 3-3 Mating connector part description  
3.5 Internal configuration  
It should not be necessary to open the Development Unit unless changing the internal switches  
for DR operation or accessing the internal test pins. Most combinations of I/O can be made from  
the front panel configuration switch. In the event that it is necessary to open the unit, Figure 3-5  
illustrates the internal layout of the Development Unit board.  
serial port 2  
serial port 1  
DR connector  
DC power  
timing connector  
JB10/11/12  
JB13/14/15  
voltage selection  
switch (3.3V or 5V)  
test points E1 to E9  
JB16/17  
JB1/2  
JB3/4  
SW3  
all off except SW3.3  
ON/OFF switch  
configuration DIP  
switch  
function LEDS  
JB5/6  
reset switch  
Figure 3-5 Internal layout of the Development Unit  
As shown in Figure 3-5, there is a selection of links that can be configured to provide  
functionality depending on the application. Table 3-4 lists the functions available.  
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Pins  
Function when linked  
Current link for 5 V supply. Can be used to  
determine current on 5 V rail. Not used for the  
Jupiter 20 module.  
JB1/2  
Current link for the primary power 3.3 V  
supply. Can be used to determine supply  
current for 3.3 V rail.  
JB3/4  
JB5/6  
Current link for the secondary power RTC  
supply. Can be used to determine supply  
current for RTC rail.  
JB10/11 5 V supplied to Pin 1 of the DR connector  
JB11/12 3.3 V supplied to Pin 1 of the DR connector  
JB13/14 not used  
JB14/15 not used  
JB16/17 Internal interface enable (normally fitted)  
Table 3-4 Pin functionality  
In addition to the configurable jumpers, there is a selection of test points on the board. The  
signals available on the test points are shown in Table 3-5.  
Test point  
Function  
TXA  
E1  
E2  
E3  
E4  
E6  
E7  
E8  
E9  
RXA  
TXB  
RXB  
1PPS  
not used  
ground  
ground  
Table 3-5 Signals available on the test points  
There are some settings that should not be changed when using the standard Jupiter 20 module  
in conjunction with the Development Unit. These are as follows:  
• SW2 must remain selected on 3.3 VDC  
• Link for JB3/4 must be fitted  
• Link for JB16/17 must be fitted  
• SW3 DIP switch must be all off except SW3.3  
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3.6 Jupiter 20 module on adapter board  
Figure 3-6 shows the adapter board with the positions of the connectors and indicators.  
power LED  
GPS fix LED  
Jupiter 20 module  
RTC backup battery  
(not normally fitted)  
J1  
antenna  
J2  
(not normally fitted)  
Figure 3-6 Jupiter 20 adapter board  
Table 3-6 lists the pin configurations for the J1 and J2 connectors.  
Jupiter function  
J2 (2.54 mm pitch header) J1 (2 mm pitch header)  
pin no.  
pin no.  
V_ANT  
1
1
VCC_RF  
V_BATT  
VDD  
2
3
3
4
5
6
7
8
9
4
M_RST  
5
GPIO3/GYRO IN  
GPIO15/FR  
BOOT  
6
7
8
GPIO1/W TICKS  
RFON  
9
10  
GND  
10  
11  
12  
TXA  
11  
12  
13  
RXA  
GPIO5/SDI  
GND  
13  
14  
15  
TXB  
14  
15  
16  
17  
18  
RXB  
GPIO7/SCK  
GND  
16  
GPIO6/SDO  
GND  
17  
18  
19  
GND  
1PPS  
19  
GPS_FIX/GPIO10  
20  
Table 3-6 Connections J1 (2 mm pitch header) and J2 (2.54 mm pitch header)  
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4.0 Operating instructions  
This section provides important information for the evaluation of the Jupiter 20 GPS module.  
Step-by-step instructions for connecting and operating the GPS development kit are included for  
first time setup.  
4.1 Initial connection and operation  
The following steps describe how to connect and operate the GPS Development Kit.  
4.1.1 Install the supplied SiRFdemo on your PC:  
1. Insert the supplied CD into the CDROM drive  
2. Double click on the SiRFDemo software icon and follow the installation process.  
4.1.2 Set up the hardware:  
1. Connect the DC power adapter to the power input J1.  
2. Connect the antenna cable to the SMA coaxial antenna connector on the rear panel of the  
Development unit.  
3. Connect the DB9 serial data cable between the PC serial communication port and the  
Development Unit’s Serial Port 1.  
4. Place the antenna in a site where a good view of the sky can be seen (refer to section 4.2 for  
more detail).  
5. Run the GPS analyser software on the PC. (Refer to section 4.4 for more details.)  
6. Connect the power supply to a suitable AC outlet.  
7. Turn the unit on using the power switch on the front panel to provide primary power to the  
Jupiter 20 receiver. Once power is applied, the Power LED should be lit.  
4.2 Positioning the GPS antenna  
The GPS antenna should be located with a clear view of the sky for optimal reception of the  
satellite signals. The 1PPS LED should begin flashing at 1 Hz once the receiver is powered  
and has started receiving at least one satellite. This provides an indication of whether or not the  
receiver is running.  
Note: GPS signals may be severely attenuated or totally obscured by roofs, solid walls, dense  
foliage, or even coated glass (found in many office structures and car windows). The  
Development Unit should be outside, or on the roof of a building to effectively evaluate  
receiver performance. With stationary developments, care should be taken to keep the  
antenna away from the side of a building as GPS signals can reflect off metal or coated  
glass. These reflections have a longer path than direct signals and can cause multi-path  
errors.  
4.3 Connecting an RTCM differential source  
For debugging purposes, it is suggested that users log both the GPS and RTCM data  
simultaneously. To allow the provision to do this, Navman can supply a software program called  
Labmon.  
The Development Unit, PC and the RTCM SC-104 differential correction source are connected  
as shown in Figure 4.1. If RTCM SC-104 data needs to be logged at the same time it is sent  
to the receiver, the OEM must supply a cable with three connectors to connect the RTCM  
correction source to the Development Unit’s auxiliary port and to an unused serial port on the  
PC. In this case, data is only logged when Labmon is invoked with file names as command line  
arguments (refer to the Labmon application note LA010103). Logging and subsequent review of  
the RTCM correction data often resolves performance or compatibility issues.  
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power  
antenna  
development unit  
optional antenna  
or pre-amplifier  
RTCM DGPS  
data source  
optional connection for logging RTCM data  
monitor  
PC  
Figure 4-1 Development Unit test equipment  
The Development Unit should be set up as shown in Figure 4-1 with only the RTCM correction  
source connected to the receiver. If the RTCM cable is not connected to the receiver’s auxiliary  
port, DGPS operation will not be possible. When RTCM data is being received the AUX LED will  
be lit.  
Note: the Development Unit may be connected to either the COM1, COM2, COM3, or COM4  
serial ports and the RTCM differential correction data source connected either directly to  
the receiver’s auxiliary I/O port, to one of the remaining serial ports of the PC, or to both  
using an OEM-supplied three-connector serial cable.  
4.4 Operating the GPS Analyser software  
There are two software packages supplied with the GPS Development kit: SiRFDemo and  
SiRFFlash. The VisualGPS program can be obtained free of charge from the VisualGPS website  
4.4.1 VisualGPS  
VisualGPS graphically presents the serial data transmitted by the receiver. The receiver output  
must be enabled in the NMEA protocol for this software to be used.  
To enable the receiver output  
1. Open the VisualGPS software installed on the PC.  
2. Select the Settings>Communications tab.  
3. When the Communications Settings window is displayed, select the correct COM Port and set  
the Baud rate to 9600 Baud.  
When this has been carried out, and the Development Unit is powered, raw NMEA data should  
appear in the NMEA Monitor Window. For more detailed information on any of the analysis  
windows, use the Help function in the top toolbar.  
4.4.2 SiRFDemo  
SiRFDemo software can provide analysis of receiver output in either SiRF binary or NMEA  
protocols. When enabled in NMEA format, the only analysis provided is raw data being  
transmitted by the receiver. While the module is transmitting serial data in NMEA format, it is  
suggested that VisualGPS is used for analysis, rather than SiRFDemo.  
To provide graphical presentation of the data, the receiver can be set to output in SiRF binary  
format.  
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To set the receiver output to SiRF binary  
1. Open the SiRFDemo software.  
2. When the Data Source setup is displayed, select the appropriate COM port and 9600 Baud  
from the drop down menu.  
3. Select the Action menu and click on Open Data Source. If the Development Unit is powered,  
and the serial port is connected to the PC, NMEA data should appear in the Debug View  
window.  
To change to SiRF binary, select the Action menu and click on the Switch to SiRF Protocol. This  
should now present information in each window, similar to that of VisualGPS. Whilst enabled in  
SiRF binary protocol, more of the analysis software’s functionality can be accessed. To switch  
back into NMEA mode, select the Action menu and click on Switch to NMEA Protocol. Select  
9600 for the baud rate and click on the Send button.  
Note: settings, including the current output protocol, are reset if all power is removed from the  
unit. For more information, refer to the SiRFDemo and SiRFFlash User Guides.  
5.0 Jupiter 20 DR (Dead Reckoning) configuration  
The DR connector on the rear panel of the Development Unit provides an interface with the  
external inputs under DR operation. This functionality is only to be used when evaluating Jupiter  
20 DR modules.  
The connector is used for signals transmitted by:  
• An angular rate sensor (gyro)  
• A wheel ticks source  
• A forward/reverse indicator  
These signals are present on many late model vehicles and may be used to assist the DR  
receiver in determining position accuracy during the loss of signal conditions. Direct connection  
to the vehicle is not normally possible as the inputs need to be 3 V logic level signals.  
Note: when using the Jupiter 20 DR version in a Development Unit, the front panel switches 1,  
2, 3 and 4 should be isolated by turning the internal switches SW3 OFF. If the front panel  
DIP switch 3 is still required, leave the internal switch SW3.3 ON.  
5.1 DR connector pin configuration  
The following sections describe the functions of the DR connector pins. Refer to Figure 5-1.  
J5  
2
4
5
6
1
3
reserved  
gyro  
ground  
+3.3 VDC,  
or +5 VDC  
direction  
wheel  
ticks  
F/R  
Figure 5-1 DR interface connector (rear of unit)  
5.1.1 Pin 1 – DC power supply  
This pin can be used to power at either 3.3 or 5 VDC for external devices used in the DR  
operation. To modify the supply voltage, refer to section 3.5 for details of the jumper positioning.  
5.1.2 Pin 2 – Heading rate gyro input  
Table 5-1 details the gyro requirements. It is important to ensure that the rate gyro signals have  
the following characteristics:  
• Range: 0 to 5 V  
• Output (no gyro rotation): 2.5 V  
• Clockwise rotation of the gyro causes the output voltage to rise  
• Maximum voltage deviation due to rotation should occur with a turning rate of 90º per  
second or less  
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The gyro should be mounted so that its sensitive axis is as near vertical as practical. Deviations  
from the vertical will reduce sensitivity for heading changes in the horizontal direction.  
Experiments have shown that acceptable performance can be achieved with mounting  
deviations of several degrees, but a better performance is achieved when the gyro is mounted  
closer to vertical.  
Characteristics  
Supply voltage  
Max. angular velocity  
Output  
Symbol  
Vcc  
Condition  
Minimum Standard Maximum  
Unit  
VDC  
deg/s  
VDC  
+4.5  
–80  
+5.0  
+5.5  
+80  
ω max  
Vo  
angular velocity = 0 at –30  
~ 80°C  
2.200  
2.500  
22.2  
2.800  
Scale factor  
Sv  
at –30 ~ 80°C  
19.3  
25.1  
3
mV/deg/s  
deg/s  
Asymmetry CW & CCW  
Temp coefficient scale  
reference temp:  
±10  
%FS  
factor  
–30 ~ 80°C  
Temp coefficient drift  
reference temp:  
9
deg/s  
–30 ~ 80°C  
Noise level  
Linearity  
7kHz noise  
20  
mVrms  
%FS  
in the maximum angular  
0.5  
velocity range  
Operating temp range  
Topr  
–40  
Table 5-1 Gyro input specifications  
85  
°C  
5.1.3 Pin 3 – Direction F/R sensor  
Input from a signal that is normally at +0 V, but rises to +3 V when the vehicle is in the reverse  
gear. Use of this signal is optional; if it is not used, the effect of occasional reversing by the  
vehicle will not significantly degrade navigation performance. To ensure minimum current under  
backup power, be sure that this input is not pulled up external to the board.  
If this signal is not connected, switch SW3.2 should be left on, with DIP switch 2 also on to  
select ‘forward’.  
5.1.4 Pin 4 – Reserved  
5.1.5 Pin 5 – Speed pulses  
The input to this pin is a pulse train generated in the vehicle. If this signal is derived from the  
vehicle’s electrical system, external level shifting for this signal is required. The pulse frequency  
is proportional to the vehicle velocity. These pulses, or wheel ticks, are generated in most  
vehicles by the ABS (Anti-lock Braking System), the transmission, or the drive shaft. System  
design must restrict the pulses between 0 and 3 V.  
Detection limits are as follows:  
• Minimum detectable rate: 1Hz  
• Maximum detectable rate: 4kHz  
5.1.6 Pin 6 – Ground  
6.0 Acronyms used in this document  
1PPS: One Pulse Per Second  
DGPS: Differential Global Positioning System  
GPIO: General Purpose Input Output  
GPS: Global Positioning System  
NMEA: National Marine Electronics Association  
RTC: Real Time Clock  
RTCM: Radio Technical Commission for Maritime services  
LA000510C © 2006 Navman NZ Ltd. All rights reserved. Proprietary information and specifications subject to change without notice.  
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© 2004 Navman NZ Ltd. All Rights Reserved.  
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LA000510C © 2006 Navman NZ Ltd. All rights reserved. Proprietary information and specifications subject to change without notice.  
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