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GPS-2700 USER’S GUIDE

 2020 Microchip Technology Inc.

DS50003016A-page 

 15

Chapter 2.  Quick-Start Instructions

2.1

POWERING UP THE UNIT

The GPS-2700 may be powered from an external 8V to 36V DC source, or simply from 
a standard USB port. Both power sources can be connected at the same time. The 
internal USB port provides a convenient way to supply power to the unit, as well as 
establish serial communications to the unit via a standard USB serial link.
Once serial communications have been established, the user can try sending, and 
experimenting with the following useful SCPI commands:
• SYST:STAT?
• GPS?
• SYNC?
• DIAG?
• MEAS?
• CSAC?
• HELP?

2.2

OPERATING THE UNIT FROM A PC’S USB PORT

1. Connect a 5V-compatible GNSS antenna to connector J4.
2. Plug in a short USB cable to USB connector U14. Plug the other end into a stan-

dard USB outlet. Please make sure that the USB cable is no longer than 1 foot 
as the IR power drop on longer cables may prevent proper operation of the unit.

No software driver is required when operating under Windows XP/7/8 or later as Win-
dows has the required USB driver already built in. Once installed, the unit should simply 
show up as a new Serial Comm Port, and the operator may use Hyperterminal, Ter-
aTerm, GPSCon, or any other serial control software to send commands and query sta-
tus from the unit. The GPSCon software package (see Chapter 5) is recommended for 
monitoring and controlling the unit.
The RS-232 serial port on connector J1 operates in parallel to the USB serial port, and 
commands can be sent and queried independently to and from both connectors. 
English language SCPI (GPIB) commands are available to switch the default serial out-
put of the unit from the RS-232 serial port to the USB port and vice-versa.

2.3

OPERATING THE UNIT FROM THE RS-232 PORT

1. Connect a 5V-compatible GNSS antenna to connector J4.
2. Plug in a clean DC power source of between 8V to 32V (36V max) to the power 

pins 15 and 16 of connector J1. Plug in the Ground connection to pins 12 and 14 
of connector J1. RS-232 Serial TX and RX signals are available on pins 9 and 8 
respectively of connector J1. Make sure not to accidentally short-out adjacent 
pins 13 and 15 of connector J1 as this would severely damage the board.

Содержание GPS-2700

Страница 1: ...2020 Microchip Technology Inc DS50003016A GPS 2700 User s Guide...

Страница 2: ...work you may have a right to sue for relief under that Act Trademarks The Microchip name and logo the Microchip logo Adaptec AnyRate AVR AVR logo AVR Freaks BesTime BitCloud chipKIT chipKIT logo Cryp...

Страница 3: ...ion to the other This material consists of a brief description of GPS 2700 design supported by block diagrams description of environmental issues installation guidelines and unit opera tion WHO SHOULD...

Страница 4: ...ters A dialog button Click OK A tab Click the Power tab N Rnnnn A number in verilog format where N is the total number of digits R is the radix and n is a digit 4 b0010 2 hF1 Text in angle brackets A...

Страница 5: ...mportant information which may make your task easier or increase your understanding WHERE TO FIND ANSWERS TO PRODUCT AND DOCUMENT QUESTIONS For additional information about the products described in t...

Страница 6: ...est software releases and archived software General Technical Support Frequently Asked Questions FAQs technical support requests online discussion groups Microchip consultant program member listing Bu...

Страница 7: ...2 Operating Principles 13 1 3 General Safety Precautions 14 1 3 1 Use an Approved Antenna Lightning Protector 14 1 3 2 Grounding 14 1 3 3 Power Connections 14 1 3 4 Environmental Conditions 14 Chapter...

Страница 8: ...ZDA int 0 255 37 3 3 17 GPS DYNAM MODE int 0 7 38 3 3 18 GPS DYNAM MODE 8 Automatic Dynamic Mode 39 3 3 19 GPS DYNAM STAT 39 3 3 20 GPS REF ADEL float s ns 32767ns 32767ns 40 3 3 21 GPS REF PUL SAW 40...

Страница 9: ...9 3 6 6 SYNC SOUR STAT 49 3 6 7 SYNC TINT 49 3 6 8 SYNC IMME 49 3 6 9 SYNC FEE 49 3 6 10 SYNC LOCK 49 3 6 11 SYNC OUT 1PPS RESET ON OFF 49 3 6 12 SYNC OUT 1PPS RESET 50 3 6 13 SYNC OUT 1PPS WIDTH int...

Страница 10: ...00 0 500 0 57 3 10 10 SERV 1PPS int ns 5000000 5000000 57 3 10 11 SERV TRAC PORT RS232 USB 57 3 10 12 SERV TRAC int 0 255 57 3 10 13 SERV EFCS FAST float 0 0 500 0 58 3 10 14 SERV EFCD FAST int 2 4000...

Страница 11: ...PSCon Utility 5 1 Description 67 5 2 Installation 67 5 3 Using GPSCon 67 5 3 1 Setting the Options 67 5 3 1 1 Communication Parameters 68 5 3 1 2 Auxillary Parameters 68 5 3 1 3 Traces Parameters 68 5...

Страница 12: ...GPS 2700 User s Guide DS50003016A page 12 2020 Microchip Technology Inc NOTES...

Страница 13: ...hat runs a Real Time OS a low noise 10 MHz distribu tion amplifier with four highly Isolated 10 MHz Sine Wave outputs one 5 MHz CMOS output one 1PPS UTC synchronized CMOS output RS 232 and USB control...

Страница 14: ...is improved typically by 10 dB and more above 8 Hz offset from the carrier and spur performance is improved significantly Software commands allow the cleanup phase noise filter to be switched in and o...

Страница 15: ...under Windows XP 7 8 or later as Win dows has the required USB driver already built in Once installed the unit should simply show up as a new Serial Comm Port and the operator may use Hyperterminal Te...

Страница 16: ...on Once the green LED is on the unit will output 10 MHz and 5 MHz on the outputs with significantly better than 1ppb frequency accuracy Please note that the GNSS receiver establishes the internal ant...

Страница 17: ...is okay and the CSAC is locked to GPS 3 3V CMOS output can drive up to 5 mA series termi nated by 33 J1 8 RX_232 RS 232 receive data RS 232 level J1 9 TX_232 RS 232 transmit data RS 232 level J1 10 GP...

Страница 18: ...single GNSS system Several of the systems operate at different carrier frequencies so using multiple GNSS systems can increase immunity against jamming which often occurs at only one carrier frequency...

Страница 19: ...ions using the automatic self survey Auto Survey with Position Hold feature or it can be used in mobile plat forms Using Position Hold mode improves timing and frequency accuracy especially in GPS cha...

Страница 20: ...nection TABLE 2 4 LCD CONNECTOR J3 PINOUT Pin Name 1 CONTRAST 2 5V 3 GND 4 LCD_RS 5 For factory use only 6 LCD_RDWR 7 For factory use only 8 LCD_ENABLE 9 For factory use only 10 LCD_DATA4 11 For facto...

Страница 21: ...e 2 1 or by grounding J1 pin 5 Momentarily activating the key cycles through the LCD display pages described in Section 2 4 5 2 LCD Display Pages The LCD page can also be selected with the SYST LCD PA...

Страница 22: ...ure 2 7 This page shows the internal ALARM indication of the CSAC oscillator itself 0x0 indicates normal operation Also shows the CSAC Oscillator steering offset required to maintain UTC lock which is...

Страница 23: ...The PLL control loop will try to zero this offset over time as the unit follows UTC at NIST in Colorado via the Satellite transmissions FEE indicates the Frequency Error Estimate which is a unit less...

Страница 24: ...eet FIGURE 2 10 Navigation Display Page GPS UTC Time Figure 2 11 This page displays the following UTC GPS Time information UTC time hh mm ss GPS time hh mm ss and leapsecond offset seconds FIGURE 2 11...

Страница 25: ...al Time Constant Fast Time Constant Loop Behavior Benign Aggressive SERV EFCS 0 6 2 0 SERV PHASECO 1 2 10 0 SERV EFCD 10 5 The commands to control the loop time constants are part of the SERV command...

Страница 26: ...14 shows the typical Allan Deviation of the GPS 2700 unit when locked to GPS ADEV performance approaches 1E 13 per day when locked to GPS The plot shows that at averaging intervals of 1000 seconds and...

Страница 27: ...d is quite good approaching 5E 12 over 100 000 seconds in this typical plot FIGURE 2 15 Allan Deviation of Free Running CSAC As shown in Figure 2 16 the Phase Noise of the GPS 2700 unit with the Phase...

Страница 28: ...noise filter disabled light trace and enabled darker trace Noise performance improve ments by the filter of almost 20 dB can be seen at 1 kHz offsets over the CSAC oscil lator by itself FIGURE 2 17 P...

Страница 29: ...Quick Start Instructions 2020 Microchip Technology Inc DS50003016A page 29 FIGURE 2 19 Alternate Comparative Phase Noise Plot...

Страница 30: ...GPS 2700 User s Guide DS50003016A page 30 2020 Microchip Technology Inc NOTES...

Страница 31: ...lease refer to the document SCPI 99 pdf for details regarding individual SCPI com mand definitions A basic familiarity with the SCPI protocol is recommended when reading this chapter As a Quick Start...

Страница 32: ...S SURV STAT GPS INIT DATE yyyy mm dd GPS INIT TIME hour min sec GPS SYST SEL GPS SBAS QZSS GAL BD GLO GPS NMEA TALK GP GN GPS NMEA SVN GP GN GPS JAM GPS FW GPS 3 3 1 GPS SAT TRA COUN This query return...

Страница 33: ...th correct UTC synchronization to the 1PPS pulse immediately prior to the data being sent Once set the NMEA command settings will be stored in NV memory and generate out put information even after pow...

Страница 34: ...er ID mode between GP and GN for GGA Microchip GGA RMC and ZDA commands See Section 3 3 32 for detailed operations and restrictions on talker ID mode This command instructs the GPS 2700 to send the NM...

Страница 35: ...rging satellite information for other GNSS systems in GPGSV sentence TABLE 3 1 PRN NUMBERING SCHEME FOR GNSS SYSTEMS GNSS Type SV Range GPGSV PRN Vehicle Numbering Talker ID GPS G1 G32 1 32 GP SBAS S1...

Страница 36: ...o generate the velocity vector every N seconds with N in the interval 0 255 GPS XYZSP int 0 255 3 3 13 GPS GNGGA int 0 255 GPS 2700 with firmware revision 0 75 and later and uBlox 8 GNSS receiver adds...

Страница 37: ...e common 3 3 15 GPS GNRMC int 0 255 GPS 2700 with firmware revision 0 75 and later and uBlox 8 GNSS receiver adds sup port for switching the talker ID mode between GP and GN for GGA Microchip GGA RMC...

Страница 38: ...Airborne 1g Airborne applications with less than 1g acceleration 6 Airborne 2g Airborne applications with less than 2g acceleration 7 Airborne 4g Airborne applications with less than 4g acceleration 8...

Страница 39: ...t per minute are required Alternatively a vehicle velocity of greater than 100 knots will also initiate a switch into airborne 1g mode Without an appropriate climb descent the unit will remain in Auto...

Страница 40: ...n changing the antenna for example since the GNSS receiver measures the antenna system s C No right after reset and adjusts its internal antenna amplifier gains accordingly It takes approximately 1 mi...

Страница 41: ...ternal RTC DATE manually when operating the unit in GPS denied environ ments This command is compatible to the PTIME OUT ON command described in Section 3 5 5 to allow automatic time and date synchron...

Страница 42: ...ing command with invalid parameter or GPS 2700 without uBlox 8 receiver will result in a Command Error response and no change to the configuration Several rules are applied when switching between GN a...

Страница 43: ...ll have GNSS specific talker ID listed in Table 3 1 for each GNSS system enabled if talker ID mode is GN This command has the following format GPS NMEA SVN GP GN If talker ID mode is GP sending GPS NM...

Страница 44: ...nd resolution will be best when the tilt of any axis is around 0 Degrees The worst performance with an accuracy of only 5 Degrees is when any of the axis are at their 90 Degree angles this is due to t...

Страница 45: ...n factors of the accelerom eter system GYRO CAL Due to the nature of the accelerometer chip the Z axis will have the largest error and lowest sensitivity of all three axis The X and Y axis will have t...

Страница 46: ...ferenced to UTC time The hour minute and second is returned 3 5 3 PTIM TIME STR This query returns the current 24 hour time suitable for display for example 13 24 56 3 5 4 PTIM TINT This query is equi...

Страница 47: ...ly apply a leapsecond correctly if the GNSS antenna is connected to the unit during the actual leapsecond event and may thus miss the leapsecond event entirely 3 5 7 PTIM LEAP PEND This command return...

Страница 48: ...nse quantifies the previous holdover The second number in the response identifies the holdover state A value of 0 indicates the receiver is not in holdover a value of 1 indi cates the receiver is in h...

Страница 49: ...3 6 7 SYNC TINT This query returns the difference or timing shift between the GPS 2700 1PPS and the GNSS 1PPS signals The resolution is 1E 10 seconds 3 6 8 SYNC IMME This command initiates a near ins...

Страница 50: ...bles disables the Phase Noise filter 3 6 15 SYNC OUT FILT This query returns the Phase Noise filter setting 3 6 16 SYNC HEA The SYNC HEA query returns a hexadecimal number indicating the system s heal...

Страница 51: ...efault setting is 220 ns allowing a drift of up to 220ns Reaching this selected threshold will cause a jam sync phase normal ization to be initiated which will also cause an indication of the SYNC HEA...

Страница 52: ...olute 5 Lifetime 871 3 8 MEASURE SUBSYSTEM The MEASURE subsystem regroups the queries related to parameters that are mea sured on board on the GPS 2700 The list of the commands supported for this subs...

Страница 53: ...PRO ON OFF This command enables disables the prompt scpi on the SCPI command lines The prompt must be enabled when used with the software GPSCon Utility This command has the following format SYST COM...

Страница 54: ...3 9 10 SYST LCD PAGE This query returns the current page of the LCD 3 9 11 SYST COMM USB BAUD 9600 19200 38400 57600 115200 This command sets the speed of the serial USB port 3 9 12 SYST COMM USB BAUD...

Страница 55: ...ce dynamically depending on the environmental effects on the CSAC The AUTO setting will quickly react to phase perturbations and will try to set NORM settings long time constant whenever the unit is i...

Страница 56: ...the servo loop This command will be effective only when SERV STAT is NORMAL or SERV MODE is OFF The command sets the Low Pass filter effectiveness of the DAC Values from 5 to 50 are typically used Lar...

Страница 57: ...e Integral part of the PID loop Loop instability will result if the parameter is set too high Typical values are 1 0 to 30 0 This command has the follow ing format SERV PHASECO float 500 0 500 0 The f...

Страница 58: ...n of the servo loop This command will be effective only when SERV STAT is FAST and SERV MODE is not OFF Controls the Proportional part of the PID loop Typical values are 0 7 to 6 0 Larger val ues incr...

Страница 59: ...too high Typical values are 1 0 to 30 0 This command has the follow ing format SERV PHASECO FAST float 500 0 500 0 The following command returns the current value for FAST Phase correction setting SE...

Страница 60: ...atus value in 0 9 as shown in Table 3 6 TABLE 3 6 CSAC STATUS DEFINITIONS Status Definition 0 Locked 1 Microwave Frequency Steering 2 Microwave Frequency Stabilization 3 Microwave Frequency Acquisitio...

Страница 61: ...laser 3 11 8 CSAC TCXO This query returns the TCXO Tuning Voltage 0VDC to 2 5VDC tuning range 10 ppm 3 11 9 CSAC SIG This query returns the indication of signal level 3 11 10 CSAC HEAT This query ret...

Страница 62: ...e model of CSAC on the GPS 2700 board 3 11 17 CSAC LOCK GPS 2700 with firmware revision 0 75 and later adds support for querying the lock sta tus of the CSAC A value of 1 is returned if the CSAC is in...

Страница 63: ...SCPI Control Quick Start Instructions 2020 Microchip Technology Inc DS50003016A page 63 CSAC FW CSAC LIFE CSAC POW...

Страница 64: ...GPS 2700 User s Guide DS50003016A page 64 2020 Microchip Technology Inc...

Страница 65: ...gic utility to upgrade the contents of Flash memory on the GPS 2700 It is available for download on the Flash Magic website http www flashmagictool com Follow the directions given on the website for i...

Страница 66: ...ware download Connect a DB 9 serial connector to the GPS 2700 as indicated in Section 2 4 Please note that the unit can only be upgraded through the RS 232 port not through the USB serial port 4 4 1 U...

Страница 67: ...erase factory calibration data the unit will not operate and will have to be returned to the factory Checking this box on the ISP utility will void the war ranty 7 Under Step 3 Hex File browse for th...

Страница 68: ...GPS 2700 User s Guide DS50003016A page 68 2020 Microchip Technology Inc NOTES...

Страница 69: ...from the website and execute the MSI installer Follow the on screen instructions to complete the installation of GPSCon 5 3 USING GPSCON The GPSCon utility has a help file that should be consulted in...

Страница 70: ...After pressing the wrench icon you can select the Auxiliary tab to configure auxiliary measurements See Figure 5 3 for an example of an auxiliary measurement You will notice that the Aux1 request str...

Страница 71: ...the drop down box in the upper left of the main window as shown in Figure 5 5 Care must be taken when sending these commands so be sure that the command that you select is supported by the GPS 2700 On...

Страница 72: ...is is harder to describe than to actually do here is a paraphrase of the above To zoom in The mouse is used to set the left extent and the right extent of the portion of the curve that the user wants...

Страница 73: ...Graphics tab in the Options dialog Export allows you to create an image file of the graph and or the satellite trails map You can select which you want by specifying a file for the Graph path and or M...

Страница 74: ...ke the same setting if any as the screen display The export may be done automatically on a timed basis Simply enter a non zero value in seconds to choose an export time interval To manually export in...

Страница 75: ...SAC senses the temperature change and actively compensate for the change In Figure 5 9 which is a zoom of Figure 5 8 we can see the phase offset error of the CSAC to the UTC GNSS reference We can see...

Страница 76: ...GPS 2700 User s Guide DS50003016A page 76 2020 Microchip Technology Inc NOTES...

Страница 77: ...00 China Xian Tel 86 29 8833 7252 China Xiamen Tel 86 592 2388138 China Zhuhai Tel 86 756 3210040 ASIA PACIFIC India Bangalore Tel 91 80 3090 4444 India New Delhi Tel 91 11 4160 8631 India Pune Tel 91...

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