Technical Manual M7-GX & M7-GX-WX GPS Transponders Raveon Technologies Corporation 2461 Impala Drive Carlsbad, CA 92010 - USA Phone +1-760-444-5995 www.raveon.com | www.ravtrack.
Table of Contents 1. General Information about the RV-M7 ...........................................................4 1.1. 1.2. 1.3. 1.4. 1.5. 1.6. 1.7. 2. 3. Operation .......................................................................................................8 Specifications ...............................................................................................11 3.1. 3.2. 3.3. 3.4. 3.5. 4. Congratulations! ...........................................................................
8. Operation .....................................................................................................41 9. FCC Licensing Information...........................................................................43 10. Technical Information ................................................................................44 10.1. Device Addressing ....................................................................................................................... 44 Addressing Basics ...............
1. General Information about the RV-M7 1.1. Congratulations! Congratulations on your purchase of a RV-M7 GPS tracking radio – the most advance UHF radio modem available today. Please take a few minutes to read this manual carefully. The information presented here will allow you to derive maximum performance from your radio modem. After reading it, keep the manual handy for quick reference, in case questions arise later on. 1.2.
1.4. Safety Training information: Antennas used for this transmitter must not exceed an antenna gain of 0 dBd. The radio modem must be used in fixed vehicle-mount configurations or at fixed basestation sites. It is not intended for portable applications.
1.5. FCC Compliance Information This device complies with part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
Overview The RV-M7 GX GPS transponder is a rugged high-speed UHF data modem with a built-in 12-channel GPS receiver. It has ½ to 5 watts of RF power output, and operates as both a GPS transponder for tracking, and a radio modem for sending and receiving data. The RV-M7 GX may be configured for a number of different GPS applications, including: Transponder: Periodically transmit position and status. TX only.
2. Operation The RV-M7 GX operates in a number of different “GPS Modes”, each mode specific to the application it is being used in. The mode of operation is set with one simple command, the GPS x command. The main GPS modes of operation are: 1)Transponder: Periodically transmits position and status over the UHF radio. Its radio receiver is disabled reducing current draw. It cannot receive messages, data, or locating information from other RVM7 GX transponders. 4800bps serial port.
GPS Mode # Common Usage Serial Port Baud Rate Output Messages GPS M7 Radio Modem 0 Unchanged - Radio Modem. No GPS, tracking, or TDMA features. GPS Transponder 4800 (local GSV, GLL, RMC) The RV-M7 GX will only transmit in this mode. The receiver is off and GPS is turned off between transmissions. This is the lowest-power consuming mode, but it is send-only.
sending ID is not present. Use to track one thing. When the GPS x command is executed, it configures the following parameters, so if your application requires any of these to be non-standard, you must issue the command to modify them AFTER the GPS x command is issued. Serial port output message format Echo characters (ATEx command) NMEAOUT NMEARATE Hardware flow control Serial port baud rate Data mute setting WMX protocol Version C15.
3. Specifications 3.1. RF And Performance Specifications Please consult the individual specification sheet for the RF and performance specifications of your specific M7 GX transponder. 3.2. General All measurements made per TIA-603-B. Certain bands are for export only. Consult the specification sheet for you specific Raveon product for regulatory approval information. Frequency: 3.3. Model RV-M7-VA ..............................................................................................
RV-M7-ab-c-oo where: a = The band (V=136-174MHz, U=406-512MHz) b = Sub band (A,B,C,…) c = Channel Spacing (blank=12.5kHz, W=25kHz) oo = Options (-GX for GPS, -WX for waterproof enclosure) Other frequency bands, power levels, and channel spacing are available. Contact the factory for your specific needs. Sub-Bands Sub-Band Letter VHF (RV-M7-V…) UHF (RV-M7-U…) A 132-150MHz 403-434MHz B 150-174MHz 419-440MHz C Version C15.
4. Electrical Inputs and Outputs The front panel of the RV-M7 GX modem has these features: 1. RF connector 2. Power LED 3. Status LED (Receive data = green, TX = red) 4. 9-Pin Serial I/O connector 5. DC Power Jack 4.1. LEDs The status LED visually show the current status of the radio. Status LED (TX) This LED blinks red when the transmitter keys and is putting out RF power. It blinks green upon the reception of data or RF carrier.
4.3. RS232/EIA232 Serial I/O Connector The RS232 9-pin serial I/O connector is a female 9-pin D-subminiature connector having the following pins configuration. It is pinned out so that it may be plugged directly into a computer or PC’s 9-pin COM port.
4.4. -WX weatherproof Version The –WX version of the product is functionally the same as the standard version, except it is IP65 rated for weather resistance. It has special water-resistant connectors on it, and a sealed enclosure to keep moisture out of the unit. The DC Input connector is a Bulgin PX0412/03P The RS232 I/O connector is a Hirose HR30-6R-6P(71) The RF I/O connection is a TNC female. Power Cord The DC power cord uses a Bulgin connector, part number SA3349/1.
RS232 serial cable for –WX version The RS232 serial cable uses at Hirose connector, part number HR30-6P-6S(71). 5. Configuring the RV-M7 GX 5.1. Overview The RS232 serial port on the unit is used to send and receive data over the air, as well as to configure the RF modem. In normal operation, the user sends serial data into the TxD pin of the user port, and this data is transmitted over the air. Received data from another RF modem is output to the user via the RxD pin of the user port.
If the RV-M7 GX is used as a GPS transponder (GPS 1 mode), the serial port need not be connected to anything. The internal GPS will initiate the transmissions of position and status. There is also a “Command Mode” used to program and configure the RV-M7 GX. In the Command Mode, the RV-M7 GX modem accepts commands via the serial port TxD pin. The commands can be used to change certain internal parameters of the RV-M7 GX modem as well as to read-out the current configuration and diagnostic statistics. 5.2.
ATDT 1234 . M7 series radios automatically save changed parameters to non-volatile EEPROM memory whenever the parameter is changed. 5.5. Reading a Parameter To read the value of a particular setting, issue the command with no parameter. The modem will return the value followed by an “OK”.
3. ATCT setting set to 60000 (60 second time-out) 4. Encryption KEYPHRASE is erased (if it was set to some KEYPHRASE and the userinterface had password protection enabled) Even though the serial baud rate reverts to 9600 baud when the CONFIG button is pressed and the IO port is RS232, it will revert back to the settings programmed into the RV-M7 GX once the Command Mode is exited.
5.9. MODEM Commands Command Command Description Parameters Factory Default ATAK Enable/Disable ARQ – When ARQ is enabled, this modem will automatically send an ACK packet back to a modem that sends it data. 0=off, 1=on. Range: 0 – 1 ATAT Silence AFTER Sequence - Sets period of silence after the command sequence characters in mS. Range:0 – 1000 (mS) ATBD Baud Rate – Sets serial com port baud rate (bps). Overthe-air (throughput) baud rate is set with ATR2 command.
ATFT ATFR ATFX ATGP ATHP Transmit Frequency – Program the transmit frequency for this channel. Enter in Hz or in MHz. The frequency will automatically be saved in non-volatile memory (flash) for this current channel number. Receive Frequency – Program the receive frequency for this channel. Enter in Hz or MHz. The frequency will automatically be saved in non-volatile memory (flash) for this current channel number. TX and RX Frequency – Program the receive and transmit frequency for this channel.
RF Power Output. Set or show the RF power output ATPO ATR0 setting. Value is in percent, from 0% to 100%. Use and RF wattmeter to confirm the power setting, and adjust the % accordingly to obtain the desired RF power level. For the MURS version, the ATPO setting is limited to 40%. Symbol Peak Deviation – Set the peak FM deviation of the transmit symbols. Note: This can be a negative number to invert the modulation. ATR1 Select CD pin output signal – CD may be RF carrier detect, or modem data detect.
transmitter. When set to 4, the receiver is off, but the transmitter will still transmit GPS positions and data. ATST ATTD Statistics – Show the unit’s operational statistics. See Statistics section of user manual. Transmit Test Data – When issued, the modem will begin transmitting data. The type of data sent is set in the parameter. Entering a will terminate the transmission. ATTE Read product temperature – Read the internal temperature of the unit’s circuit board in degrees Celsius.
5.10. GPS Related Commands The following commands are unique to the –GX version of the RV-M7. When you execute any of these commands, the new parameter is automatically stored in EEPROM. Command ATHX ATMC DATAMUTE FREEWHEEL GPS GPS&F IDLERATE KEYPHRASE MAXBYTES NMEAOUT NMEAMASK NMEARATE OUTPUT Command Description Singe-hop repeat. Only applicable if repeater function is enabled. (ATXR = 1) 0 = repeater will repeat as programmed. 1 = will not repeat any packet that has already been repeated.
PREFIX PROX REPEAT REPORT x y SLOTQTY SLOTNUM SLOTTIME TALKERID TDMATIME TDMADATA TRIGBITS ID Prefix. Set an ID prefix. The prefix is 1-8 characters that will be put in front of the ID when reporting an ID as a waypoint name. A dash means no prefix. Default is a capitol letter V. Proximity Alert. Set a minimum proximity distance. When any RV-M7 GX with properly configured ID codes and KEYPHRASE comes within this many meters of this unit, a proximity warning is triggered.
always sent each transmission, regardless of this setting. TRIGPOL TRIGEX TRIGDX TRIGSPEED TXRATE TLLPARM 5.11. Polarity of the input bits. 0 = normal active high operation(causes unit to transmit when it goes high), 1 = Inverted, active low. This is a HEX number. Bit 0 is IN0, bit 1 is IN1…. Any bit set to one in this parameter will set the particular bit to be “active low”. Setting this to 0 will set all input bits to be active high.
RF Power Output ......................................................... 5 watts Channel number selected ............................................ 1 Position/Status report interval ...................................... 10 seconds Minimum movement distance to report ........................ 0 (reports even when idle) Transmission trigger inputs .......................................... 0 (digital inputs disabled) Security KEY ................................................................
6. Setup and Initial Configuration 1. Connect a DC power source to the DC IN connection on the front of the modem. 2. Connect a good quality antenna, cut to the operating frequency, to the RF connector on the front of the modem. Use a good quality antenna, and place it as high-above obstructions as possible. 3. Connect a computer terminal, or PC computer running HyperTerminal, to the 9pin I/O connector. The factory default serial ports settings are 4800 bps, 8 data bits, 1 stop, no parity.
SLOTNUM This will change the TDMA slot assignment, leaving the ID (MYID) unchanged. Typically, the ID and the slot number are the same. Once this command is used, the TDMA slot number for this transceiver to will not change if the ID of the device is changed. Set SLOTNUM to -1 to force the Slot Number to be automatically set to the MYID of the radio. This is the factory default setting. 7. Connect your serial data device (GPS, Plotter, PC…) to the 9-pin connector on the front of the modem.
3 4 5 6.2. 151.940 MHz 154.570 MHz 154.600 MHz GPS Operation Mode Configuration The GPS x command is provided to make configuring the RV-M7 simple to setup for common configurations. The following table summarizes the various standard configurations. Choose the configuration that is most similar to your usage, and execute the appropriate GPS x command. See Section 3 for a complete list of the various GPS modes.
RV-M7 GX GPS Modes of Operation GPS display and/or MDT Data Modem with GPS info Data Modem with GPS info 3 $GPTLL ( x=2 ) 4 $GPWPL ( x=3 ) 5 $PRAVE ( x=1 ) 6 $GPWPL ( x=3 ) 11 nothing ( x=3 ) Yes(1) 13 $GPGLL & GPVTG No(0) Yes (1) No (0) No(0) No(0) TX & RX (0) Yes TX & RX (0) Yes RX only (1) Yes RX (1) No RX & TX (0) Yes 10 RX & TX (0) No 10 RX & TX (0) Yes 10 10 10 0 0 (off) (off) 0 0 (off) 0 (off) 38400 Yes 38400 Yes 4800 Yes N/A 38400 Yes 0 4800 Yes N/
6.3. Position Transmission When the RV-M7 GX transmits its position, it also reports other status information such as voltage, input bits, temperature, velocity, and heading. All of these parameters are compressed into a short data packet, and sent over the air in the proper TDMA time slot. Each RV-M7 GX is assigned a time slot, based upon its ID. ID 1 is slot 1, ID 2 is slot 2… Position/status reporting happens in one of 2 intervals. A) At the TXRATE setting.
RV-M7 GX Transmission Trigger Diagram M7 GX Technical Manual 33 Raveon Technologies Corp.
6.5. Digital Inputs (Trigger Bits) The stock RV-M7 GX Transponder has 3 digital inputs. The status of these input bits is transmitted every time the M7 reports its position. When configuring an M7 GX, you may configure any or all of the digital inputs to be “Trigger Bits”. The status of all bits is transmitted every time, but when a bit is designated as a Trigger Bit, it will also cause the M7 to wake-up if it is sleeping, and triggers it to send a transmission as soon as it can.
TRIGBITS x This command enables or disables individual bits for use as input triggers. If a bit is designated a Trigger Bit, then its state is latched until it is transmitted. TRIGPOL x Sets the polarity of the input trigger bit. 0=active high, 1=inverted, active low. Setting TRIGPOL 0 will mean all trigger bits are active high, and their state will be latched as a high (1) if the bit ever goes high. TRIGEX x Sets which bits are used to report on exception.
TRIGBITS 1 (enables bit 0) TRIGEX 1 (configures bit 0 for exception reporting) To configure all bits to be used to report when they change, issue these commands: TRIGBITS 7 (enables bit 0, 1 and 2) TRIGEX 7 (configures bit 0, 1, and 2 for exception reporting) To configure bit 0 to be used to report when it changes, bit 1 to cause a report when it goes low, and disable bit 2, use these commands.
GX radios. The GPS will normally output various NMEA messages from its serial port. These NMEA messages from the external GPS must not be transmitted, or the radio channel will become much too busy. The RV-M7 GX “mutes” its data input when configured in GPS mode 4. The RV-M7 GX will send position/status as well as transmit and receive serial data when it is in GPS mode 2. Serial Port Baud Rate While the modem is transmitting, the user may continue to send more data into the RV-M7.
The RV-M7 GX can output this message when it receives a position report from other RV-M7 GX transponders. A plotter or display connected to it that supports the TLL message, should put an icon on its screen at the location specified by the RV-M7. The icon name is the MYID of the RV-M7 that transmitted its position over the air. $GPWPL NMEA WayPoint List. Output 3 This message is commonly used to share waypoint locations among GPS units.
KEYPHRASE Jkl53hhp ID Addressing Basics ID addressing is used to differentiate one RV-M7 Transponder from another. Each must have a unique number programmed into them, so that when a position report is received, the RV-M7 GX that sent the message can be identified. This is called the MYID of the unit that sent the message. Each RV-M7 GX has a MYID programmed into it, and is represented as a 4 digit decimal number. RV-M7 GX IDs may be any number between 0001 and 9999.
position. These parameters are programmable, and may be re-configured based upon the type of system they are used in. 6.9. Local NMEA data from the internal GPS The M7 GPS transponders and the Atlas PL personal locators may be configured to output NMEA 0183 GPS messages from its internal GPS receiver. For GPS tracking, these GPS transponders can receive GPS position reports from other radios, and they may also be configured to output their own GPS location via their serial port.
3. Connect a good quality antenna, tuned to the operating frequency, to the RF connector on the front of the modem. Use a good antenna, and place is at as high-above obstructions as possible. 4. A separation distance of at least 20 centimeters must be maintained between the transmitter's radiating structures and the body of the user or nearby persons. 5. Connect a GPS antenna to the SMA connector of the RV-M7 GX.
In GPS mode 1 (Transponder), the unit will power-down the radio receiver because it does not receive any over-the-air messages. It will also power-down the GPS if the TXRATE setting is long enough for it to turn the GPS off, and back-on before the next time it needs to report position. For example, if the TXRATE is set to 120 (2 minutes), the RV-M7 GX will power the GPS off for most all of this time, only turning on the GPS long enough before it needs to transmit so that it can get a position fix.
9. FCC Licensing Information RV-M7 radio modems operate on radio frequencies that are regulated by the Federal Communications Commission (FCC). In order to transmit on these frequencies, you are required to have a license issued by the FCC. Almost everyone engaged in public safety activities - as well as private organizations, are required, to obtain a radio station license from the Federal Communications Commission if they wish to use a radio transmitter.
10. Technical Information 10.1. Device Addressing Addressing Basics One of the more powerful aspects of the RV-M7 GX transponder is its addressing scheme. Addressing allows multiple radio systems on the same frequency to coexist, and not interfere with each other. Addressing is used to differentiate one RV-M7 Transponder from another. Each unit has a unique number, so that when a position report is received, the RV-M7 GX that sent the message is known. It is not a security measure.
When communicating over the air, RV-M7 modems transmit their Group number, Unit Address and the Destination Address along with the data. Receiving modems check the received Group Number and Destination Address, and see if it matches their own Group and Unit Address. If it does match, the receiving modem outputs the data/position information it received via its serial port. If it does not match, the receiving modem discards the data, and does not send it out the serial port.
Sending to Destination Address = 1001 Receiving Unit Address = 0001 Receiving Unit’s Address Mask = F000 Result: No data will be received, because the address do not match, and the address mask of FFFF requires that at least the first digit match. . Example 3 (able to receive a data from a sub-group, 1000 – 1999) Sending to Destination Address = 1236 Receiving RV-M7 Unit Address = 1234 Receiving RV-M7 Address Mask = F000 Result: Data will be received. 1236 ANDed with F00 is 1000.
Figure 1 Overview of Repeater Operation In the example shown in Figure 3 above, RV-M7 A is will communicate with all other modems in the system. It can directly communicate with B, H, and F. Because of propagation limits, it cannot communicate reliable to E, D, C, and G. To solve this problem, some of the RV-M7 modems are configured as repeaters. The still are able to send and receive data, but they also will repeat data out to the modems that are out of range of RV-M7 A.
by this unit. It will not repeat messages from D, E, F, G, or H because their Unit IDs are not in the Repeat Source repeater table. The second command above sets the Repeat Source to 1000 and the Repeat Destination to 1000, both with a Mask of FFFF. The FFFF mask means all digits of the source and destination are used to determine if the transmission should be repeated. All packets from units with MYID 1000 (A)sent 1000 will be repeated by this unit.
9600 baud as at 4800 baud. Its performance is optimized for 4800 baud 2-level modulation and 8000 baud 4-level modulation. If 4-level modulation is used (8000 and 9600 baud over-the-air), the “Modulation Balance” procedure must be re-done anytime the radio frequency is changed. This procedure must be done by a qualified radio technician. See section 10.7 for details on how to do this procedure. The maximum over-the-air baud-rate for a wide-band model (25kHz channel spacing) is 19200bps.
A unit may be allocated additional time slots. The SLOTQTY command sets the number of slots each unit receives. It is normally set to 1. 10.5. Configuring TDMA Operation Step 1. Determine your over-the-air baud rate. See section 11.3 for information on baud-rate selection. Raveon recommends 4800 baud for narrow-band and 9600 baud for wide-band radios. Step 2. Determine the position transmission time, in milliseconds. Again, review the table in section 11.
200mS, then the TDMATIME must be at least 17.4 seconds so a value of 20seconds for the TDMA time is appropriate. 10.6. Debug Related Commands Bench Testing (Must be in command mode to test. Enter +++ at the keyboard to put unit into config/test mode.) ATTD x Various transmit test routines. 0 = Go back to normal mode. Stops the test. 1 = Random data transmit. 2 = Hop up/down one channel 3 = Force PLL to fast lock mode 4 = Transmit all 0s 5 = Transmit all 1s 6 = Enable the test points on the PCB.
in radio test and calibration, the values stored in the R registers should not be modified. Improper adjustment of the radio calibration (R0-R9 and RA registers), can result in failure of the radio modem. Calibration and alignment values are stored internal to the modem in the “R” registers. (R0-R9 and RA). For example, to read R5, issue the ATR8 command without any parameter. To change the setting, issue the ATR8 nn command, where nn is the new value you would like to store.
1. Set-up a service monitor to monitor the FM deviation of the transmitted signal on an oscilloscope. The frequency response of the demodulated FM signal must be greater than 10Hz to 5kHz without any de-emphasis. 2. Transmit random data with the RV-M7, using the ATDT 1 command. This command will cause the RV-M7 to automatically key up, and send random data for one minute. 3. Verify the DC center of the demodulated data is stable.
5. Generate an RF signal on-channel with a level of -110dBm. Verify the Power/BUSY LED stays on. If it does not, repeat step 4, adjusting in increments of 10. Busy-Channel Lock Out If your system operation require the RV-M7 modem to monitor-before-transmit, of if you do not want the RV-M7 to transmit on a channel that is busy, you can enable “Busy-Channel-Lockout”, using the ATBC 1 command. ATBC 0 disables BCL, and thus the modem will transmit whenever it has data to send out.
11. RV-M7 Diagnostic Provisions 11.1. Overview of Diagnostics Internal to the RV-M7 radio modem, is a powerful 32-bit microprocessor. Along with handing all aspects of radio modulation and demodulation, the microprocessor also maintains an extensive array of diagnostic information. This section details the diagnostic information available, and describes how to us the information to optimize or troubleshoot a RV-M7 radio network. 11.2.
ST10 Statistic Read – Returns numeric values, comma separated, of all statistics as described in the ST command. M7 GX Technical Manual 56 Run time display screen Raveon Technologies Corp.
11.4.
11.7. ATST3 Command The ATST3 command, will return the time and date the firmware in the RV-M7 was compiled. 11.8. ATST4 Command The ATST4 command will return internal timers that tell how long the modem has been powered up and running. All of these timers restart a 0 upon power up.
12. Antenna Information Key to a successful installation is the choice and installation of a good antenna system. A good quality antenna can more than double the range of a radio system. Properly locating the antenna is vital to creating a quality radio link, and a poor installation can decrease the range of the system by as much at 90%. Use these guidelines to evaluate your antenna system design, and be sure contact a quality radio communication equipment distributor such as Talley Electronics (http://www.
13. Troubleshooting Symptom: Unit will not receive Solution #1. Verify that the modem is on the correct RF channel. If it is, the Status LED should blink green every time another modem tries to transmit to it. If the Status LED does not blink when it should be receiving, it is on the wrong RF frequency. Soultion #2. If the addresses match, and Status LED blinks green but still no reception of data, verify that the RTS signal is asserted.
(ATSM 1), then the RV-M7 will turn off when the DTR line is off, or the program connected to the serial port is closed, or the RS-232 connector is un plugged. Solution #5. Verify trigger input bit 3 is not enabled. The RV-M7 GX has the ability to use the TxD input pin of the RS232 port as a general-purpose digital input. If this bit is used as an input, the RV-M7 GX modem will not transmit serial data entering the serial port. IN3 is the serial data input.
replace the fuse, the unit must be carefully check for damage and proper operation before being installed. If you replace the fuse, you must use a Littlefuse brand fuse, part number 0297003 or Raveon part, number 1X726-3 to maintain calibration of your unit. Solution #3. Verify Low Power Mode. The RV-M7 has an optional Low Power Mode (LPM). If LPM is enabled, the RV-M7 will power down whenever the DTR line of the serial port is turned off. The Power LED will blink once every 10 seconds in the LPM mode.
14. Mechanical M7 GX Technical Manual 63 Raveon Technologies Corp.
15. RV-M7 GX Messages The RV-M7 GX sends and receives messages in the NMEA 0183 format. NMEA is a standard protocol, use by GPS receivers to transmit data. NMEA output is EIA422A but for most purposes it is RS-232 compatible. Use 4800 bps, 8 data bits, no parity and one stop bit ( 8N1 ) for standard NMEA data. NMEA 0183 sentences are all ASCII characters. Each sentence begins with a dollar sign ($) and ends with a carriage return linefeed (). Data is comma delimited.
The following sentence is from unit 0006, prefix set to “BUOY”, temperature and voltage parameters appended. $GPTLL,06,3308.9098,N,11713.1306,W,BUOY6(27C 12.9V ),41840,T,*06 15.2. $GPGSV Satellites In View When this message comes out of the RV-M7 GX, it identifies the number of satellites its internal GPS has in view. Up to 3 satellites may be reported in one message. The RV-M7 GX typically does not report any satellite information other than the Number of Satellites in view.
waypoint ID field, the RV-M7 GX puts the ID of the RV-M7 that transmitted its position. For example, if a RV-M7 GX receives a position report from ID 0003 located at 4917.16N , 12310.64W it sends out the following message. $GPWPL,4917.16,N,12310.64,W,3*65 The lat/lon is sent using the dddmm.mm format, where ddd is the degrees, and mm.mmmm is the decimal minutes. There is no sign to these numbers. GPS 4 mode with the $GPWPL message is the most common way of using the RV-M7 GX with a hand-held or mobile GPS.
4 Latitude 5 Longitude 6 UTC time 7 GPS Status 8 9 10 Num Satellites Altitude Temperature 11 12 13 Voltage IO status RSSI 14 15 16 Speed Heading Status 17 Spare 18 19 * Checksum dddmm.mmmm format. It is signed. + is north, - is south. No sign means north. Note: typically there are 4 decimal places, but as few as 0 decimal places are possible. Null field if no GPS lock. dddmm.mmmm format. It is signed. + is east, - is west. No sign means east.
$GPGLL,3308.7292,N,11713.7886,W,155803,A,*1C $GPVTG,0,T,,,0.00,N,0.00,K,*1F $GPGLL,3308.7284,N,11713.7882,W,155813,A,*1E $GPVTG,0,T,,,0.00,N,0.00,K,*1F $GPGLL,3308.7273,N,11713.7880,W,155823,A,*17 $GPVTG,28,T,,,1.08,N,2.00,K,*2E $GPGLL,3308.7226,N,11713.7896,W,155833,A,*11 $GPVTG,140,T,,,1.62,N,3.00,K,*1C $GPGLL,3308.7140,N,11713.7860,W,155843,A,*1C $GPVTG,260,T,,,1.62,N,3.00,K,*1D $GPGLL,3308.7134,N,11713.7998,W,155853,A,*18 $GPVTG,266,T,,,3.24,N,6.00,K,*1E $GPGLL,3308.7145,N,11713.
Limited One Year Warranty If within one year from date of purchase, this product fails due to a defect in material or workmanship, Raveon Technologies, Incorporated will repair or replace it, at Raveon’s sole discretion. This warranty is extended to the original consumer purchaser only and is not transferable.
