Digitus DA-80101 User manual

USB MOUSE
GPS RECEIVER
USER’S GUIDE

Contents
1. Introduction ……………………………………………………..…………. 2
1.1 Overview ………………………………………………………………………2
1.2 Features ………………………………………………………………..………2
1.3 Electrical Characteristics …………………………………………………… 2
2. Hardware Interface ………………………………………………………….4
2.1 Dimension …………………………………………………………………… 4
2.2 Interface ………………………………………………………..……………..4
2.3 Connector …………………………………………………………...…..…….5
3. Operation …………………………………………………………………….6
3.1 USB Driver Installation and Com Port Searching ………………………….. 6
3.2 Getting Start …………………………………………………………………10
3.3 Viewer for Testing ………..………………………………………………… 11
3.4 Function ……………………………………………………………………. 12
3.5 Navigation ……………………………………………………………………12
4. Warranty …………………………………………………….…………….. 12
Appendix: Software Specifications ……………………………………….. 13
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1. Introduction
1.1 Overview
The DA-80101 series GPS receiver incorporates low noise, high sensitivity, low power consumption
SiRF StarⅢchipset solution in a compact, waterproof enclosure. The receiver is very suitable for
broad applications such as car navigation, mapping, surveying, etc. Only clear view of sky and
certain power supply are necessary to the unit. It communicates with other host device via one full
duplex serial communication RS-232 port or one universal USB port. With its ultra low power
consumption, the receiver tracks up to 20 satellites at a time while offering fast time-to-first-fix,
re-acquires satellite signals less than 1 second (average) and updates position data every second.
1.2 Features
The DA-80101 series provides a host of features that make it easy for integration and use.
1. With SiRF StarⅢhigh sensitivity chipset.
2. High performance receiver tracks up to 20 satellites.
3. Compact design ideal for applications with minimal space.
4. A rechargeable battery sustains internal clock and memory.
5. User initialization is not required.
6. One full duplex serial RS-232 port or USB port meets all applications.
7. Waterproof design for all weather.
8. Built-in low noise, high gain active antenna.
9. LED display provides users visible positioning status.
10. Support Standard NMEA-0183 and SiRF Binary protocol.
1.3 Electrical Characteristics
General
Frequency L1, 1575.42 MHz
C/A code 1.023 MHz chip rate
Channels 20 channels all in view tracking
Antenna internal
2

icrosecond sync
Sensitivity
Tracking -159 dBm typical
Accuracy
Position < 10 meters, 2D RMS
< 7 meters 2D RMS, WAAS corrected
1-5 meters, DGPS corrected
Time1 m hronized to GPS time
Datum
Default WGS-84
Acquisition Rate (Open Sky)
Hot start 1 sec, average
Warm start 38 sec, average
Cold start 42 sec, average
Reacquisition 0.1 sec, average
Dynamic Conditions
Altitude < 18,000 meters (60,000 feet)
Velocity < 515 meters/sec (1000 knots)
Acceleration < 4G
Jerk 20meters/secmax
Power Consumption
Main power input 5.0 ±5% VDC input.
Supply Current 80 mA @5V
Serial Port
Electrical interface One full duplex serial communication via RS232/ TTL interface.
Protocol message NMEA-0183, SiRF Binary.
Default NMEA GGA, GSA, GSV, RMC, (VTG, GLL, and ZDA optional).
4800 baud rate (other rate optional).
8 bits data, 1 stop bit, no parity.
Weight < 85 g
Environmental Characteristics
Operating temperature range -40 oC to +80 oC
Storage temperature range -45 oC to +95 oC
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2. Hardware Interface
2.1 Dimension
The receiver enclosure is with the dimension:
59.7 mm (L) x 39 mm (W) x 16.4 mm (H)
2.2 Interface
The DA-80101 series GPS receiver includes a variety of models. The main difference is the output
connector. These interface options are described in the following.
DA-80101
DA-80101 is with a PS2 DIN jack output connector. Following figure shows various connection
arrangements. The one-piece cigarette lighter adapter assembly allows you to utilize power from the
front power socket of vehicles. Simply connect DA-80101 to the PS-2 plug of the adapter assembly
and link the other connector to your PDA. For Notebook users, a PS-2 to USB adapter assembly is
required. This is an optional purchase. A CD with USB driver is provided with the assembly. For
users intend to use RS-232 port of PC or Notebook, the other optional adaptor assembly can be
purchased.
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2.3 Connector
Following are the description of the output connector.
DA-80101
Standard cable is two meters in length with a female PS-2 Jack as shown in the following.
Pin assignment of standard PS-2 Din Jack connector is in the following drawing and table.
Pin Signal
1 Tx (RS-232)
2 +5VDC
3 Tx (TTL)
4 GND
5 Rx (TTL)
6 Rx (RS-232)
DA-80101 PS2
The accessory is a Y-cable with a cigarette lighter adapter to a vehicle’s front power socket. Please
refer to the drawing on previous page. The Y cable is with one branch of PS2 Plug to connect to the
PS2 Jack of DA-80101, while the other branch to connect to a PDA. However, due to the many
variety of PDAs, an appropriate adaptor type must be specified.
For users with PC or Notebook, a USB interface cable or RS-232 adaptor cable shown in previous page
may be used. Drivers for the USB interface cable are available on a CD associated with the cable.
These are optional purchases.
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DA-80101USB
DA-80101USB provides PC or Notebook users a convenient choice. There is no unusual assignment
about the connector. Definitions of USB connector pins are compliant with the standard.
DA-80101 USB
3. Operation
3.1 USB Driver Installation and Com Port Searching
For DA-80101 series GPS receiver using the USB type terminal, you have to install the driver first.
Here we use WinXP OS as an example. Please insert the installation CD into CD-ROM drive. You
can browse the CD contents and find the “USB Driver” folder.
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Please open the folder and double click the PL-2303 driver icon. The installation will start. Please
click the “Next” button on the InstallShield Wizard’s “Welcome” window.
Once the InstallShield Wizard completes the installation of the driver to your system, please click
“Finish” button.
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You can plug the receiver’s USB terminal into USB port on your PC or NB now. However, for
receiving the GPS data stream properly, you have to set the correct Com port and Baud rate in the
utility software. Here is an easy approach for finding which Com port the mouse is connecting to.
Please click Start →Settings, and then select “Control Panel.”
Please click the “System” icon and open the “System Properties” window.
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Click the “Hardware” tab and find the “Device Manager” button on the page.
Click the button and the window will show the hardware status. Please find the “Ports (Com &
LPT)” category and look for the Com port shown “Prolific USB-to-Serial Com Port (COMxx)”, the
xx is the Com port number you are connecting to.
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Although the above installation steps are under WinXP, basically the procedures are somewhat the
same for other Windows operating systems.
3.2 Getting Start
Connect the DA-80101 GPS receiver with an appropriate adaptor assembly. It depends on the type of
power source and host device. Install USB driver first when you connect to a host device with a USB
adaptor cable.
Take the GPS receiver to places with clear view of the sky. The Red LED indicates the status.
(a) LED steady on when power is connected and for the initial acquisition process;
(b) LED flashes with 0.5 second on and 0.5 second off when the receiver outputs position fix data.
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3.3 Viewer for Testing
Install appropriate viewer program to host device. You may check the status of the GPS receiver
whenever you like to. Following are standard buttons and operation steps.
(a) Execute the Viewer program. Press the “COM” button to set “Com Port” for this data link and
“Baud Rate” to 4800.
(b) Click “OPEN” to download the received data. Usually one window shows the NMEA format
data stream and another window shows tracked satellite constellation and signal quality status.
(c) Once the link is successful, click “CLOSE” button to exit the program. However, you may click
the “Cold” button to perform “cold start” testing.
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3.4 Function
As soon as the power on, the DA-80101 series GPS receiver begins the process of satellite acquisition,
and tracking. Under normal circumstances, it takes around 42 seconds (average) to achieve a position
fix at the first time. After a position fix has been calculated, information about valid position, velocity,
and time is transmitted over the output channel. The DA-80101 GPS receiver utilizes initial data,
such as last stored position, date, time and satellite orbital data, to achieve maximum acquisition
performance. If significant inaccuracy exists in the initial data or the orbital data is obsolete, it may
take more time to achieve a navigation solution.
3.5 Navigation
After the acquisition process is complete, the DA-80101 sends valid navigation information over output
channels. These data include:
1) Latitude/longitude/altitude
2) Velocity
3) Date/time
4) Error estimates
5) Satellite and receiver status
4. Warranty
The GPS smart receiver is warranted to be free from defects in material and functions for one year from
the date of purchase. Any failure of this product within this period under normal conditions will be
replaced at no charge to the customers.
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Appendix: Software Specifications
NMEA Protocol
The DA-80101 interface protocol is based on the National Marine Electronics Association
(NMEA) interface specification, namely, the NMEA 0183 standard. The DA-80101 is capable
of supporting following NMEA message formats specifically developed and defined by SiRF.
NMEA Message Prefix Format Direction
$GPGGA Time, position and fix type data. Out
$GPGLL Latitude, longitude, time of position fix and status. Out
$GPGSA GNSS DOP and active satellites Out
$GPGSV Satellites in view. Out
$GPMSS Radio beacon signal-to-noise ratio, signal strength,
frequency, etc. Out
$GPRMC Recommended minimum specific GNSS data. Out
$GPVTG Speed and course over ground. Out
$GPZDA Date and time. Out
General NMEA Format
The general NMEA format consists of anASCII string commencing with a ‘$’character and
terminating with a <CR><LF> sequence. NMEA standard messages commence with ‘GP’ then a
3-letter message identifier. The message header is followed by a comma delimited list of fields
optionally terminated with a checksum consisting of an asterix ‘*’and a 2 digit hex value
representing the checksum. There is no comma preceding the checksum field. When present,
the checksum is calculated as a bitwise exclusive of the characters between the ‘$’and ‘*’. As an
ASCII representation, the number of digits in each number will vary depending on the number and
precision, hence the record length will vary. Certain fields may be omitted if they are not used,
in which case the field position is reserved using commas to ensure correct interpretation of
subsequent fields.
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$GPGGA
This message transfers global positioning system fix data. Following is an example.
$GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M, , , ,0000*18
The $GPGGA message structure is shown below:
Field Example Unit Notes
Message ID $GPGGA GGA protocol header.
UTC Time 161229.487 hhmmss.sss
Latitude 3723.2475 ddmm.mmmm
N/S Indicator N N=north or S=south.
Longitude 12158.3416 dddmm.mmmm
E/W indicator W E=east or W=west.
Position Fix Indictor 1
0: Fix not available or invalid.
1: GPS SPS mode, fix valid.
2: Differ. GPS, SPS mode, fix valid
3-5: Not supported.
6: Dead Reckoning Mode, fix valid. (1)
Satellites Used 07 Number of satellites used to calculate fix.
Range 0 to 12.
HDOP 1.0 Horizontal Dilution of Precision.
MSLAltitude (2) 9.0 Meter Altitude above mean seal level.
Units M Meter M stands for “meters”.
Geoid Separation (2) Meter Separation from Geoids can be blank.
Units Meter M stands for “meters”.
Age of Diff. Corr. Second Age in seconds. Blank (Null) fields when
DGPS is not used.
Diff Ref. Station ID 0000
Checksum *18
<CR> <LF> Message terminator.
(1) Only apply to NMEA version 2.3 (and later) in this NMEA message description.
(2) SiRF does not support geoid corrections. Values are WGS84 ellipsoid heights.
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$GPGLL
This message transfers geographic position, latitude, longitude, and time. Following is an
example.
$GPGLL,3723.2475,N,12158.3416,W,161229.487,A,A*41
The $GPGLL message structure is shown below:
Field Example Unit Notes
Message ID $GPGLL GLL protocol header.
Latitude 3723.2475 ddmm.mmmm
N/S Indicator N N=north or S=south.
Longitude 12158.3416 dddmm.mmmm
E/W indicator W E=east or W=west.
UTC Time 161229.487 hhmmss.sss
Status A A: Data valid or V: Data invalid.
Mode A
A=Autonomous, D=DGPS, E=DR
(Only present in NMEA version 3.00).
Checksum *41
<CR><LF> Message terminator.
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$GPGSA
This message transfers DOP and active satellites information. Following is an example.
$GPGSA,A,3,07,02,26,27,09,04,15, , , , , ,1.8,1.0,1.5*33
The $GPGSA message structure is shown below:
Field Example Unit Notes
Message ID $GPGSA GSA protocol header.
Mode A
M: Manual, forced to operate in selected 2D
or 3D mode.
A: Automatic switching between modes.
Mode 3
1 Fix not available.
2 2D position fix.
3 3D position fix.
Satellites Used (1) 07 SV on channel 1.
Satellites Used (1) 02 SV on channel 2.
… ..
Satellites Used (1) SV on channel 12.
PDOP 1.8
HDOP 1.0
VDOP 1.5
Checksum *33
<CR> <LF> Message terminator.
(1) Satellites used in solution.
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$GPGSV
This message transfers information about satellites in view. The $GPGSV message structure is
shown below. Each record contains the information for up to 4 channels, allowing up to 12
satellites in view. In the final record of the sequence the unused channel fields are left blank with
commas to indicate that a field has been omitted. Following is an example.
$GPGSV,2,1,07,07,79,048,42,02,51,062,43,26,36,256,42,27,27,138,42*71
$GPGSV,2,2,07,09,23,313,42,04,19,159,41,15,12,041,42*41
The $GPGSV message structure is shown below:
Field Example Unit Notes
Message ID $GPGSV GSA protocol header.
Number of messages (1) 2 Number of messages, maximum 3.
Message number 1 Sequence number, range 1 to 3.
Satellites in view 07 Number of satellites currently in view.
Satellite ID 07 Channel 1, ID range 1 to 32.
Elevation 79 degree Elevation of satellite, maximum 90.
Azimuth 048 degree Azimuth of satellite, range 0 to 359.
SNR (C/N0) 42 dBHz Range 0 to 99, null when not tracking.
Satellite ID 02 Channel 2, ID range 1 to 32.
Elevation 51 degree Elevation of satellite, maximum 90.
Azimuth 062 degree Azimuth of satellite, range 0 to 359.
SNR (C/N0) 43 dBHz Range 0 to 99, null when not tracking.
Satellite ID 26 Channel 3, ID range 1 to 32.
Elevation 36 degree Elevation of satellite, maximum 90.
Azimuth 256 degree Azimuth of satellite, range 0 to 359.
SNR (C/N0) 42 dBHz Range 0 to 99, null when not tracking.
Satellite ID 27 Channel 4, ID range 1 to 32.
Elevation 27 degree Elevation of satellite, maximum 90.
Azimuth 138 degree Azimuth of satellite, range 0 to 359.
SNR (C/N0) 42 dBHz Range 0 to 99, null when not tracking.
Checksum *71
<CR> <LF> Message terminator.
(1) Depending on the number of satellites tracked multiple messages of GSV data may be required.
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$GPMSS
This message transfers information about radio beacon signal-to-noise ratio, signal strength,
frequency, etc. Following is an example.
$GPMSS,55,27,318.0,100,1,*57
The $GPMSS message format is shown below.
Field Example Unit Notes
Message ID $GPMSS MSS protocol header.
Signal Strength 55 dB SS of tracked frequency.
Signal-to-Noise Ratio 27 dB SNR of tracked frequency.
Beacon Frequency 318.0 kHz Currently tracked frequency.
Beacon Bit Rate 100 Bits per second.
Channel Number (1) 1 The channel of the beacon being used if a
multi-channel beacon receiver is used.
Checksum *57
<CR> <LF> Message terminator.
(1) Fields marked in italic red apply only to NMEA version 2.3 (and later) in this NMEA message description.
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$GPRMC
This message transfers recommended minimum specific GNSS data. Following is an example.
$GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,120598, ,*10
The $GPRMC message format is shown below.
Field Example Unit Notes
Message ID $GPRMC RMC protocol header.
UTC Time 161229.487 hhmmss.sss
Status A A: Data valid or V: Data invalid.
Latitude 3723.2475 ddmm.mmmm
N/S Indicator N N=north or S=south.
Longitude 12158.3416 ddmm.mmmm
E/W indicator W E=east or W=west.
Speed over ground 0.13 knot Speed over ground
Course over ground 309.62 degree Course over ground
Date 120598 ddmmyy, current date.
Magnetic variation (1) degree Not used.
Mode (2) A A=Autonomous, D=DGPS, E=DR.
Checksum *10
<CR> <LF> Message terminator.
(1) SiRF does not support magnetic declination. All “course over ground” data are geodetic WGS84 directions.
(2) Fields marked in italic red apply only to NMEA version 2.3 (and later) in this NMEA message description.
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