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SR-89 Manual V1.0 GPS Engine Board Manual SSSSRRRR----88889999 SiRF Star ⅢⅢⅢⅢ V 1.1 Made in Taiwan 2008/08/08 service@dagamagps.com www.dagamagps.com Free service hot-line(for mainland):400-820-1322

SR-89 Manual V1.0 Specifications subject to change without prior notice! Contents 1. Introduction ………………………………………………………..…………. 3 1.1 Overview ……………………………………………………………………. 3 2. Technical Specifications …………………………………………………… 4 2.1. Electrical Characteristics…………………………………………………. 4 2.2. Environmental Characteristics……………………………………..……… 5 2.3. Physical Characteristics……………………………………………...…..… 5 3. Applications ……………………………………………………………… 6 4. Operation and Test (optional) ………………..……………… 7 Appendix: Software Specifications ……………………………………….. 8 2 SR-89 User’s Manual V1.1

1. Introduction 1.1. Overview SR-89 Manual V1.0 Product Introduction The SR-89 GPS modules incorporates high sensitivity, high performance SiRF StarⅢ chipset solution in a compact design. The module tracks up to 20 satellites at a time while offering fast time-to-first-fix and 1Hz navigation update. The unit is very suitable for space-sensitive applications. Main Features ■ High sensitivity SiRF StarⅢ chipset. ■ High performance receiver tracks up to 20 satellites. ■ TTL output for GPS command interface. ■ Low power consumption. ■ Average Cold Start time under 42 seconds. ■ On-chip 1Mb SRAM. ■ Reacquisition time 0.1 second. ■ Support accurate 1PPS output signal aligned with GPS timing. ■ Support Standard NMEA-0183 and SiRF Binary protocol. ■ WAAS/EGNOS support ■ Compact size 28.2mm*20mm*2.9mm ■ Easy integration into hand-held devices. The SR-89 design utilizes the latest surface mount technology and high level circuit integration to achieve superior performance while minimizing dimension and power consumption. This hardware capability combined with software intelligence makes the board easy to be integrated and used in all kinds of navigation applications or products. The module communicates with application system via TTL level with NMEA-0183 protocol. 3 SR-89 User’s Manual V1.1

SR-89 Manual V1.0 2. Technical Specifications 2.1. Electrical Characteristics 2.1.1 General Frequency C/A code Channels 2.1.2 Sensitivity Tracking 2.1.3 Accuracy (Open Sky) L1, 1575.42 MHz 1.023 MHz chip rate 20 channels all in view tracking -159 dBm typical Position Time 2.1.4 Datum Default < 10 meters, 2D RMS < 7 meters 2D RMS, WAAS corrected 1-5 meters, DGPS corrected 1 microsecond synchronized to GPS time WGS-84 2.1.5 Acquisition Rate (Open Sky) Hot start Warm start Cold start Reacquisition 1 sec, average 38 sec, average 42 sec, average 0.1 sec, average 2.1.6 Dynamic Conditions Altitude Velocity Acceleration Jerk 2.1.7 Power < 18,000 meters (60,000 feet) < 515 meters/sec (1000 knots) < 4 G 20 meters/sec max Main power input Supply Current 3.3 VDC, ±5% < 80 mA 4 SR-89 User’s Manual V1.1

2.1.8 Serial Port Electrical interface Protocol support Default NMEA 2.1.9 Time SR-89 Manual V1.0 TTL level NMEA-0183, SiRF Binary GGA, GSA, GSV, RMC, (GLL, VTG, and ZDA optional) 4800 baud rate (other rate optional) 8 bits data, 1 stop bit, no parity. 1 PPS Pulse, pulse duration 1µs. Time reference at the pulse positive edge. Synchronized to GPS time, ±1µs. 2.2. Environmental Characteristics Operating temperature range Storage temperature range -40 oC to +85 oC -45 oC to +100 oC 2.3. Physical Characteristics Mechanical Outline 5 SR-89 User’s Manual V1.1

SR-89 Manual V1.0 Pin assignment Pin 1 2 3 4 5 6 7 Pin Name Function description GND Ground Pin 8 Pin Name BATTERY Function description Backup battery input (2.5–3.3V) RFIN GND GND GND GND GPS RF signal input Ground Ground Ground Ground VCC_IN +3V DC power input 9 10 11 12 13 LED_ON_OFF 1 Hz High/Low pulse output TX RX GND GND Serial Data Output Serial Data input Ground Ground 3. Applications The SR-89 engine module is a high performance, ultra low power consumption, GPS receiver. Applications are as follow: Car Navigation Wrist Watch Solar Operated Device Marine Navigation Fleet Management AVL and Location-Based Services Radar detector with GPS function Hand-Held Device for Personal Positioning and Navigation Ideal for PDA, Pocket PC and Other Computing Devices at GPS Application 6 SR-89 User’s Manual V1.1

SR-89 Manual V1.0 4. Operation and Test (optional) The customers can change the data protocol and communication data baud rate for their applications using a GPS Viewer software. Installing 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. 7 SR-89 User’s Manual V1.1

Appendix: Software Specifications SR-89 Manual V1.0 NMEA Protocol The SR-89 software is capable of supporting the following NMEA message formats specifically developed and defined by SiRF. NMEA Message Prefix $GPGGA $GPGLL $GPGSA $GPGSV $GPMSS $GPRMC $GPVTG $GPZDA Format Direction Time, position and fix type data. Latitude, longitude, time of position fix and status. GNSS DOP and active satellites Satellites in view. Radio beacon signal-to-noise ratio, signal strength, frequency, etc. Recommended minimum specific GNSS data. Speed and course over ground. Date and time. Out Out Out Out Out Out Out Out General NMEA Format The general NMEA format consists of an ASCII string commencing with a ‘$’ character and terminating with a 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. 8 SR-89 User’s Manual V1.1

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