Global Sat ET-332 Bedienungsanleitung

ET-332

Specifications are subject to be changed without notice.

Page 1 of 15

Version 1.3.1

GPS Engine Board

ET-332

Globalsat Technology Corporation

16F., No. 186, Jian-Yi Road, Chung-Ho City, Taipei Hsien 235,

Ta i wa n

Tel: 886-2-8226-3799/ Fax: 886-2-8226-3899

service@globalsat.com.tw

www.globalsat.com.tw

USGlobalSat, Inc.

1308 John Reed Court, City of Industry, CA 91745

Tel: 626-968-4145 / Fax: 626-968-4373

oem@usglobalsat.com

www.usglobalsat.com

ET-332

Specifications are subject to be changed without notice.

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Version 1.3.1

1. Product Information

Product Part I.D. ET-332

Product Description:

The ET-332 GPS engine board is low cost but maintains high reliability and accuracy making it an

ideal choice for integration with OEM/ODM systems.

Product Features:

9SiRF Star III/ LP Single

9Very high sensitivity (Tracking Sensitivity: -159dBm)

9Compact PCB allows for easier integration into space limited environments.

9Supports the NMEA 0183 data protocol

9Foliage Lock for weak signal tracking

9All-in-view 20-channel parallel processing

9Snap Lock 100mc re-acquisition time

9Enhanced algorithm for navigation stability

9Superior urban canyon performance

9WAAS / EGNOS MSAS support

9Built-in SuperCap to maintain system data for rapid satellite acquisition

9RoHS compliant

Product Specifications

GPS Receiver

Chipset SiRF Star III/LP Single

Frequency L1, 1575.42 MHz

Code 1.023 Mhz chip rate

Protocol Electrical Level: TTL level,

Output Voltage Level: 0V~2.85V

Baud Rate: 4800 bps

Output Message: NMEA 0183 GGA, GSA,

GSV, RMC (VTG, GLL optional)

Channels 20

Sensitivity -159dBm

Cold Start 42 seconds average

ET-332

Specifications are subject to be changed without notice.

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Version 1.3.1

Warm Start 38 seconds average

Hot Start 1 second average

Reacquisition 0.1 second average

Accuracy Position: 10 meters, 2D RMS

5 meters, 2D RMS, WAAS

enabled

Velocity: 0.1 m/s

Time: 1us synchronized to GPS time

Maximum Altitude 18,000 meter (60,000 feet) max

Maximum Velocity 515 meter/second (1000 knots) max

Maximum Acceleration 4G

Jerk 20m/sec **3

Interface

I/O Connector Type

External Antenna Port

Physical Characteristics

Dimensions 1.6” x 1.4” x 0.4” (40.5 x 35 x 10 mm)

DC Characteristics

Power Supply 3.8V ~ 6.5V DC Input

Backup Voltage 2.5 ~ 3.6V 10uA backup current

Power Consumption 42mA (Continuous Mode)

25mA (Trickle Power Mode)

Environmental Range

Humidity Range 5% to 95% non-condensing

Operation Temperature -40F to +176F (-40C to +85C)

ET-332

Specifications are subject to be changed without notice.

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Version 1.3.1

2. Technical Information

Physical Characteristics

ET-332

Specifications are subject to be changed without notice.

Page 5 of 15

Version 1.3.1

Pin Assignment

Pin Name Description Type

1 GND Ground

2 VBAT Backup Battery Input

3 VDC 3.8V~6.5V DC Power Input Input

4 PBRES Push Button Reset Input (Active Low) Input

5 GPIO1 (Reserved)

6 TXA Serial Data Output A (GPS Data) Output

7 RXA Serial Data Input A (Command) Input

8 GND Ground

9 GND Ground

10 SELECT (Reserved)

11 TIMEMARK 1PPS Time Mark Output Output

12 GND Ground

ET-332

Specifications are subject to be changed without notice.

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Version 1.3.1

Pin Explanation

VCC: (DC power input) This is the main DC supply for a 3.8V ~ 6.5V power module board.

VBAT: This is the battery backup input that powers the SRAM and RTC when main power is removed.

Typical current draw is 10uA. Without an external backup battery, the module/engine board will execute a

cold star after every turn on. To achieve the faster start-up offered by a hot or warm start, a battery

backup must be connected. To maximize battery lifetime, the battery voltage should be between 2.5v and

3.6v.

PBRES: (Push Button Reset) This pin provides an active-low reset input to the engine board. It causes

the engine board to reset and start searching for satellites.

SELECT: Do not connect (do not use)

TX: This is the main transmit channel for outputting navigation and measurement data to user’s

navigation software or user-written software. Output TTL level, 0V ~ 2.85V

RX: This is the main receive channel for receiving software commands to the engine board from

SiRfdemo software or from user-written software. (NOTE:When not in use this pin must be kept “HIGH”

for operation. From Vcc connect a 470 Ohm resistor in series with a 3.2v Zener diode to Ground. Then,

connect the Rx input to Zener’s cathode to pull the input “HIGH”.)

TIME MARK (1PPS): This pin provides one pulse-per-second output from the engine board that is

synchronized to GPS time

GND: GND provides the ground for the engine boards. Be sure to connect all grounds

Mounting

Recommended mounting methods:

a. Use industrial grade double-sided foam tape. Place it on the bottom side of the engine board.

b. A recessed cavity in your housing design with a foam pad to eliminate shifting or movement.

c. Use provided mounting holes on the GPS engine board PCB.

3. Software Commands

NMEA Output Command

GGA-Global Positioning System Fixed Data

Table B-2 contains the values for the following example:

$GPGGA,161229.487,3723.2475,N,12158.3416,W,1,07,1.0,9.0,M,,,,0000*18

ET-332

Specifications are subject to be changed without notice.

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Version 1.3.1

Table B-2 GGA Data Format

Name Example Units Description

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 Indicator 1 See Table B-3

Satellites Used 07 Range 0 to 12

HDOP 1.0 Horizontal Dilution of Precision

MSL Altitude19.0 meters

Units M meters

Geoid Separation1meters

Units M meters

Age of Diff. Corr. second Null fields when DGPS is not used

Diff. Ref. Station ID 0000

Checksum *18

<CR><LF> End of message termination

SiRF Technology Inc. does not support geoid corrections. Values are WGS84 ellipsoid heights.

Table B-3 Position Fix Indicator

Value Description

0 Fix not available or invalid

1 GPS SPS Mode, fix valid

2 Differential GPS, SPS Mode , fix valid

3 GPS PPS Mode, fix valid

GLL-Geographic Position-Latitude/Longitude

Table B-4 contains the values for the following example:

$GPGLL,3723.2475,N,12158.3416,W,161229.487,A*2C

Table B-4 GLL Data Format

Name Example Units Description

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

ET-332

Specifications are subject to be changed without notice.

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Version 1.3.1

UTC Position 161229.487 hhmmss.sss

Status A A=data valid or V=data not valid

Checksum *2C

<CR><LF> End of message termination

GSA-GNSS DOP and Active Satellites

Table B-5 contains the values for the following example:

$GPGSA,A,3,07,02,26,27,09,04,15,,,,,,1.8,1.0,1.5*33

TableB-5GSADataFormat

Name Example Units Description

Message ID $GPGSA GSA protocol header

Mode1 A See Table B-6

Mode2 3 See Table B-7

Satellite Used107 Sv on Channel 1

Satellite Used102 Sv on Channel 2

Satellite Used1Sv on Channel 12

PDOP 1.8 Position dilution of Precision

HDOP 1.0 Horizontal dilution of Precision

VDOP 1.5 Vertical dilution of Precision

Checksum *33

<CR><LF> End of message termination

1. Satellite used in solution.

TableB-6Mode1

Value Description

M Manual-forced to operate in 2D or 3D mode

A 2D automatic-allowed to automatically switch 2D/3D

TableB-7Mode2

Value Description

1 Fix Not Available

2 2D

3 3D

GSV-GNSS Satellites in View

Table B-8 contains the values for the following example:

$GPGSV,2,1,07,07,79,048,42,02,51,062,43,26,36,256,42,27,27,138,42*71

ET-332

Specifications are subject to be changed without notice.

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Version 1.3.1

$GPGSV,2,2,07,09,23,313,42,04,19,159,41,15,12,041,42*41

TableB-8GSVDataFormat

Name Example Units Description

Message ID $GPGSV GSV protocol header

Number of Messages12 Range 1 to 3

Message Number11 Range 1 to 3

Satellites in View 07

Satellite ID 07 Channel 1(Range 1 to 32)

Elevation 79 degrees Channel 1(Maximum90)

Azimuth 048 degrees Channel 1(True, Range 0 to 3

SNR(C/No) 42 dBHz Range 0 to 99,null when not tr

……. …….

Satellite ID 27 Channel 4 (Range 1 to 32)

Elevation 27 Degrees Channel 4(Maximum90)

Azimuth 138 Degrees Channel 4(True, Range 0 to 3

SNR(C/No) 42 dBHz Range 0 to 99,null when not tr

Checksum *71

<CR><LF> End of message termination

Depending on the number of satellites tracked multiple messages of GSV data may be required.

ET-332

Specifications are subject to be changed without notice.

Page 10 of 15

Version 1.3.1

RMC-Recommended Minimum Specific GNSS Data

Table B-9 contains the values for the following example:

$GPRMC,161229.487,A,3723.2475,N,12158.3416,W,0.13,309.62,120598,,*10

Table B-9 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 Variation2degrees E=east or W=west

Checksum *10

<CR><LF> End of message termination

SiRF Technology Inc. does not support magnetic declination. All “course over ground” data are

Geodetic WGS48 directions.

VTG-Course Over Ground and Ground Speed

$GPVTG,309.62,T,,M,0.13,N,0.2,K*6E

Table B-9 VTG Data Format

Name Example Units Description

Message ID $GPVTG VTG protocol header

Course 309.62 degrees Measured heading

Reference T True

Course degrees Measured heading

Reference M Magnetic

Speed 0.13 knots Measured horizontal speed

Units N Knots

Speed 0.2 Km/hr Measured horizontal speed

Units K Kilometers per hour

Checksum *6E

<CR><LF> End of message termination

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