SV12 GPS Receiver User’s Manual CTI06-117 May 2006 Prepared by: Coleman Technologies, Inc.
Table of Contents 1.0 PREFACE ......................................................................................................................................... 1 2.0 SV12 GPS RECEIVER OVERVIEW............................................................................................. 1 2.1 2.1.1 2.2 2.3 2.4 3.0 Interface Protocols ..................................................................................................................... 2 SV12 GPS Serial Port Interface ..............
1.0 PREFACE The Global Positioning System (GPS) is a satellite based navigation system operated and maintained by the U.S. Government. The GPS consists of a constellation of 24 satellites providing world-wide, 24 hour, three dimensional (3-D) coverage. GPS applications include military, surveying, marine, land, aviation, and vehicle navigation. GPS is the most accurate technology available for vehicle navigation/location.
acquires a position fix with minimal delay after power cycling. The following information is necessary to help decrease the time to track satellites after power-up and is stored in RAM when backup power is provided: • • • • Almanac Ephemeris Real-time clock Last position User settings, including port parameters and receiver processing options, can be stored in non-volatile electrically erasable (EEPROM) that does not require power.
TAIP TAIP is an easy-to-use ASCII protocol developed by Trimble for vehicle tracking. The user can set up polling schemes and mark GPS messages with unique identifiers. The TAIP messages and output rates are user selectable and can be configured to operate on either Port 1 or Port 2. NMEA 0183 NMEA 0183 is an industry standard protocol common to marine applications. NMEA provides direct compatibility with other NMEA-capable devices such as chart plotters, radars, etc.
earth. Trimble’s active antennas include a preamplifier that filters and amplifies the GPS signals before delivery to the receiver. There are two GPS antennas offered by Coleman Technologies, Inc. (1) magnetic mount antenna and (2) bullet antenna. Equivalent antennas are available through 3rd party vendors, for example Tessco at www.tessco.com. One needs to choose an active antenna which is either a 3v, 3.3v or 3/5v antenna.
2. Connect the antenna cable to the receiver. Push the connector onto the MCX connector on the receiver. To remove the antenna cable, pull the antenna connector off of the MCX connector. 3. Place the antenna so that it has a clear view of the sky. 4. Using the DC power cable, connect to the 3-pin power connector on the receiver. Connect the terminated end of the power cable to the power connector on the receiver.
Note – 3.0 V is the minimum allowable voltage for battery backup. When the power output drops below 3.0 V, the real-time clock may not operate over the specified full temperature range and this can significantly extend the time to first fix. Power requirements are listed in Table 3.1.1-1 Signal Battery Backup Ground VCC 3.1.2 Table 3.1.1-1 Power Requirements Voltage Current +3.0 to 12 0 µA with prime power; 20 µA @ 3.
3.2 Software Interface This section describes the SV12 GPS Receiver software interface, the start-up characteristics for the different interface protocols, a description of the receiver operating modes, and a brief description of the interface protocols. 3.2.1 Start-up When connected to an external GPS, the SV12 GPS Receiver contains all the circuitry necessary to automatically acquire GPS satellite signals, track up to 12 GPS satellites, and compute location, speed, heading, and time.
Table 3.2.3-1 Default Serial Port Characteristics for the TSIP and NMEA Receiver Port Input Protocol Default Setup Output Language Default Setup NMEA Baud Rate: 4800 1 RTCM Baud Rate: 4800 Data Bits: 8 Data Bits: 8 Parity: None Parity: None Stop Bits: 1 Stop Bits: 1 No Flow Control No Flow Control TSIP Baud Rate: 9600 2 TSIP Baud Rate: 9600 Data Bits: 8 Data Bits: 8 Parity: Odd Parity: Odd Stop Bits: 1 Stop Bits: 1 No Flow Control No Flow Control Table 3.2.
Table 3.2.4-3 TAIP Receiver Protocol Summary Setting Default NMEA 0183 out/RTCM SC-104 V2.1 In Port 1: 4800 baud none-8-1 TAIP bi-directional Port 2: 4800 baud none-8-1 TSIP Data Output The Trimble Standard Interface Protocol (TSIP) is the native language for the SV12 GPS Receiver. TSIP is a binary language with a wide variety of commands and reports. TSIP reports can be output automatically, or they can be output as responses to queries. The format of the automatic reports can be easily configured.
Note – Although the SV12 GPS Receiver supports the seven NMEA sentences that contain GPS information, the factory default setting for the receiver only outputs the GGA and VTG data strings. To change the output interval or sentence output, use TSIP Command Packet 0x7A.
Appendix A – Specifications PHYSICAL CHARACTERISTICS TECHNICAL SPECIFICATIONS Dimensions Prime Power +9 to +32 VDC input Metal Enclosure Power consumption (nominal) 25 mA, 30 mW, at 12V, +25oC, with antenna Mounting flange Back-up power +3.0 to +12 VDC (20 µa @ +3.3V, +25oC) Serial ports (2) RS-232 Weight I/O Protocol options TSIP (Trimble Standard Interface Protocol) Connectors @ 9600 baud, 8-Odd-1 Antenna TAIP (Trimble ASCII Interface Protocol) Serial data (2) @ 4800 baud, 8-None-1 Power NMEA 0183 v3.
