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.

Page 2 of 15

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

Specifications are subject to be changed without notice.

Page 3 of 15

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.

Page 4 of 15

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.

Page 5 of 15

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.

Page 6 of 15

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.

Page 7 of 15

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.

Page 8 of 15

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.

Page 9 of 15

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.

Page 10 of 15

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

This manual suits for next models

Table of contents

Other Global Sat GPS manuals

Global Sat

Global Sat BU-303 User manual

Global Sat

Global Sat Globalsat BT-359 User manual

Global Sat

Global Sat TR-150 User manual

Global Sat

Global Sat TR-313 User manual

Global Sat

Global Sat MR-350 Owner's manual

Global Sat

Global Sat BU-303 User manual

Global Sat

Global Sat TR-102 User manual

Global Sat

Global Sat TW-100 User manual

Global Sat

Global Sat GD-101 User manual

Global Sat

Global Sat ET-212 User manual

Global Sat

Global Sat BR-355 User manual

Global Sat

Global Sat GH-625B User manual

Global Sat

Global Sat GD-102 User manual

Global Sat

Global Sat ER-411 User manual

Global Sat

Global Sat TR-600 User manual

Global Sat

Global Sat GD-102 User manual

Global Sat

Global Sat TR-101 User manual

Global Sat

Global Sat LT-100 Series User manual

Global Sat

Global Sat GTR-388A12 User manual

Global Sat

Global Sat BT-821 User manual

Global Sat

Global Sat MR-350N User manual

Global Sat

Global Sat TR-102 User manual

Global Sat

Global Sat BU-353S4 User manual

Global Sat

Global Sat BC-337 User manual

Popular GPS manuals by other brands

Raven

Raven Cruizer II Manual

Hama

Hama 53118 Operating instruction

Garmin

Garmin SOUNDER 125 Owner's manual & reference

Garmin

Garmin DEZL 580 owner's manual

Jigabot

Jigabot EX quick start guide

Pointer

Pointer Cellocator CelloTrack XT LTE overview

Queclink

Queclink GV55LITE user manual

Voxson

Voxson Voxtrack GPS500 Quick user guide

Garmin

Garmin ECHOMAP PLUS owner's manual

Starcom Systems

Starcom Systems Kylos Compact user guide

Garmin

Garmin 15 H Series Technical specifications

Cobra

Cobra Marine MC 600Ci owner's manual

Cellocator

Cellocator CelloTrack T installation guide

Enfora

Enfora Mini-MT GSM2228UG001 user guide

Magellan

Magellan eXplorist 100 Reference manual

LTE

LTE G50B user manual

Garmin

Garmin DEZL OTR500 owner's manual

SkyGolf

SkyGolf SkyCaddie SG1 user guide