User manual HOLUX GR-271

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Manual abstract: user guide HOLUX GR-271

Detailed instructions for use are in the User's Guide.

 [. . . ] 20 parallel satellite-tracking channels for fast acquisition and reacquisition Built-in hardware tracking loop processor WAAS/EGNOS demodulator Low power consumption with star chipset Built-in rechargeable battery for memory and RTC backup and for fast time to first fix(TTFF) Support NMEA0183 v2. 2 data protocol and SiRF binary code Enhanced algorithms-SnapLock and SnapStart provide superior navigation performance in urban,  canyon and foliage environments Support CF card type I connector suitable PDA,  Hand Held PC or PC device

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2. Brief Information
2. 1 Hardware Interface
2. 1. 1 GR-271 Dimension
93. 5 (L) x 43 (W) x 11 (H) mm

2. 1. 2 Hardware Interface

External Antenna Connector

LED

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A. Link to NoteBook

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2. 1. 3 LED & External Antenna
 LED LED OFF LED ON LED Flashing GR-271 CF GPS Receiver Switch Off.  [. . . ] Satellite ID Elevation Azimuth SNR (C/No) Checksum <CR> <LF> Example $GPGSV 2 1 07 07 79 048 42 . . . . 27 27 138 42 *71 Table 2-7 GSV Data Format Units Description GSV protocol header Range 1 to 3 Range 1 to 3 degrees degrees dBHz degrees degrees dBHz Channel 1 (Range 1 to 32) Channel 1 (Maximum 90) Channel 1 (True,  Range 0 to 359) Range 0 to 99,  null when not tracking Channel 4 (Range 1 to 32) Channel 4 (Maximum 90) Channel 4 (True,  Range 0 to 359) Range 0 to 99,  null when not tracking End of message termination

NOTE: Items <4>, <5>, <6> and <7> repeat for each satellite in view to a maximum of four (4) satellites per sentence. Additional satellites in view information must be sent in subsequent sentences. These fields will be null if unused. 

2. 2. 1. 4 Recommended Minimum Specific GNSS Data (RMC)
Table 2-8 contains the values for the following example: $GPRMC, 161229. 487, A, 3723. 2475, N, 12158. 3416, W, 0. 13, 309. 62, 120598,  , *10 Table 2-8 RMC Data Format Name Example Units Description Message ID $GPRMC RMC protocol header UTC Time 161229. 487 hhmmss. sss Status A A=data valid or V=data not valid 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 Speed Over Ground 0. 13 knots Course Over Ground 309. 62 degrees True Date 120598 ddmmyy Magnetic Variation1 degrees E=east or W=west Checksum *10 <CR> <LF> End of message termination 1. SiRF Technology Inc. All "course over ground" data are geodetic WGS84 directions. 

2. 2. 2 RTCM Received Data
The default communication parameters for DGPS Input are 9600 baud,  8 data bits,  stop bit,  and no parity. Position accuracy of less than 5 meters can be achieved with the GR-271 by using Differential GPS (DGPS) real-time pseudo-range correction data in RTCM SC-104 format,  with message types 1, 2,  or 9. As using DGPS receiver with different 7

communication parameters,  GR-271 may decode the data correctly to generate accurate messages and save them in battery-back SRAM for later computing. 

3. Install GPSViewer. exe from PC to your PDA(Microsoft Pocket PC OS or alike). (1) Install Microsoft ActiveSync to your PC,  refer to your Pocket PC manual for installation procedure. (2) Setup your Pocket PC cradle to Desktop PC UART port. The Microsoft ActiveSync will detect your Pocket PC automatically. 

(3) Double Click the GpsViewer. exe on your PC,  then GpsViewer. exe program will install automatically. 

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2. Push "Start""programs" bottom" GPS Viewer"

3. Push "Scan" bottom to scan your Com Port. then push "Open GPS" bottom. 

Select your Com Port (COM 1COM 10)

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4. Select "GPS Status" to show the satellite diagram like below. 

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4. Trouble Shooting
Problem Reason
Weak or no GPS signal can be received at the place of GR-271 CF GPS

Solution
Connect an external antenna which locate as a open space to your GR-271 CF GPS and then press Reset Button Go outdoor and press Reset Button to try again,  or connect an external antenna to improve the poor GPS signal. Pocket PC support multiple types of CPU. Make sure you download the correct software.  [. . . ] Power consumption <80mA at 3. 3V+/-10% input Protocol and interface: NMEA output protocol: V. 2. 2 Baud rate: 4800 bps Data bit: 8 Parity: N

EGNOS/WAAS Position < 2. 2 m,  horizontal 95% of time < 5 m,  vertical 95% of time Dynamic Conditions: Altitude 18, 000 meters max. (60, 000 feet ) Velocity 515 meters / second max. (700 knots) Acceleration Jerk 4 G,  max 20 meters/second,  max

Stop bit: 1 Output format: Standard: GGA, GSA, GSV,  RMC.  [. . . ]

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