Global Sat ET-112 User manual

ET-112

Specifications are subject to be changed without notice.

Page 1 of 15

Version 1.3

GPS Engine Board

ET-112/ER-112

Globalsat Technology Corporation

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

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

service@globalsat.com.tw

www.globalsat.com.tw

USGlobalSat, Inc.

14740 Yorba Court, Chino, CA 91710

Tel: 909.597.8525 / Fax: 909.597.8532

oem@usglobalsat.com

www.usglobalsat.com

ET-112

Specifications are subject to be changed without notice.

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Version 1.3

1. Product Information

Product Part I.D. ET-112

Product Description

The ET-112 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

SiRF GSC2x high performance GPS Chip Set

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

Extremely fast TTFF (Time To First Fix) at low signal levels

Supports the NMEA 0183 data protocol

Connector for active antenna

Enhanced algorithm for navigation stability

Foliage Lock for weak signal tracking

All-in-view 20-channel parallel processing

Snap Lock 100ms re-acquisition time

Superior urban canyon performance

Full-duplex RS-232 for navigation and control messages

Differential GPS capability through second RS232 port

RoHS compliant

Product Specifications

GPS Receiver

Chipset SiRF GSC2X 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)

Serial I/O Port 1-port for GPS

1-port for DGPS

ET-112

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Version 1.3

Channels 20

Sensitivity -155dBw

Cold Start 48 seconds average

Warm Start 38 seconds average

Hot Start 8 second average

Reacquisition 0.1 second average

Accuracy Position: 15 meters, 2D RMS 10 meters,

2D RMS, WAAS enable 1~5 meters DGPS

corrected

Velocity: 0.1 ms (95% SA Off)

Time: 1µs synchronized to GPS time

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

Maximum Velocity 515 meter/second (1000 knots) max

Maximum Acceleration 4G

Datum WGS-84

Jerk Limit Jerk: 20m/sec **3

Electrical Level

ET-112: TTL output voltage: 0~3.5V

ER-112: RS232 Level

Communication Full-Duplex asynchronous

Code Type ASCII

Protocol NMEA 0183 (default) / SiRF Binary

(available)

GPS Message Output NMEA 0183 >> GGA, GSA, GSV, RMC,

(VTG & GLL optional)

DGPS Protocol RTCM SC-104, v2.00, type 1, 2 and 9

Time Mark (1 PPS) Level: TTL

Pulse Duration: 100ms

Time Reference: At the pulse positive edge

Measurement: Aligned to GPS sec, +/- 1us

Interface

External Antenna Port MMCX

Physical Characteristic

Dimensions 2.8” x 1.6” x 0.4” (71 x 40.5 x10mm)

DC Characteristics

Power Supply 3.8V~6.5V DC

ET-112

Specifications are subject to be changed without notice.

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Version 1.3

Backup Voltage +2.5V to +3.6V

Power Consumption 42mA (Continuous Mode)

29mA (Trickle Power Mode)

Backup Current 10uA typical

Environmental Range

Humidity Range

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

2. Technical Information

Physical Characteristics

ET-112

Specifications are subject to be changed without notice.

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Version 1.3

OPTIONAL MCX CONNECTOR

Φ4.5

1. Needs external Active-antenna & its power Vant.6.4 mm

2. Needs external Vdc = 3.8 --- 6.5 Vcc 10.0 mm

3. Current supply I = 150 mA

4. PCB SIZE: 40.64mm x 71.12mm Φ0.95 pin x 5

5. Connector (pitch=2.0 mm) pin-assignment

Pin Assignment

ET-112 equipped with MMCX female

connector

ET-112

Specifications are subject to be changed without notice.

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Version 1.3

1 VANT Antenna DC Voltage (Input)

2 VDC 3.3~5.5 DC power input (Input)

3 VBAT Backup Battery (Input)

4 VDC (shorted with pin #2)

5 PBRES Push Button Reset Input (Active Low) (Input)

6 ---- (RESERVED)

7 SELECT Download data from RS232 to flash ROM (RESERVED)

8 ---- (RESERVED)

9 ---- (RESERVED)

10 GND Ground

11 TXA Serial Data Output A (GPS Data)

12 RXA Serial Data Input A(Commands)

13 GND Ground

14 TXB Serial Data Output B (Not Used)

15 RXB Serial Data Input B (Not Used)

16 GND Ground

17 ---- (RESERVED)

18 GND Ground

19 TIMEMARK 1PPS Time Mark Output

20 ---- (RESERVED)

Pin Explanation

VANT: DC Voltage is for an active antenna.

VDC: (DC power input) This is the main DC supply for a 3.3V~5.5V power module board.

VBAT: (Backup Battery) This is the battery backup that powers the SRAM and RTC when main power is

removed. Typical current draw is 10uA. Without an external backup battery or Gold-capacitor, the

module/engine board will execute a cold start after every turn on. To achieve the faster start, a battery or

capacitor should be installed. To maximize battery lifetime, the battery voltage should not exceed the

supply voltage and 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.

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

ET-112

Specifications are subject to be changed without notice.

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Version 1.3

navigation software or user-written software.

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

Demo 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 ¼ Watt 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”.)

TXB: No function. Do not connect.

RXB: This is the auxiliary receive channel for inputting differential corrections to the engine board to

enable DGPS navigation.

Time Mark: 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

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

ET-112

Specifications are subject to be changed without notice.

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Version 1.3

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

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

ET-112

Specifications are subject to be changed without notice.

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Version 1.3

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

$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

ET-112

Specifications are subject to be changed without notice.

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Version 1.3

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.

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

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