Manual Simrad MX521A DGPS Sensor English www.simrad-yachting.
Manual Simrad MX521A GPS/DGPS Sensor English Document no: 727052 Revision: A Date: March 2008 The original language for this document is English. In the event of any discrepancy between translated versions and the English version of this document, the English document will be the official version. To the best of our knowledge, the content in this publication was correct at the time of printing.
IMPORTANT NOTICE! THE MX521A GPS/DGPS SENSOR IS AN AID TO NAVIGATION ONLY. Under no circumstances should it be used in lieu of authorized government charts. Its accuracy can be affected by many factors such as equipment defects, environmental conditions, or improper operation. The user is responsible for safe navigation of the vessel. This includes consulting authorized government charts and exercising common prudence and navigational judgement at all times.
Contents 1 General........................................................ 5 Supplied Equipment.......................................6 2 Operation.................................................... 7 General........................................................7 Satellite Based Augmentation System (SBAS)....7 Receiver Autonomous Integrity Monitoring (RAIM).........................................................8 3 Installation..................................................
Blank page 4 | Simrad MX525A
1 General This manual describes the operation and installation of the MX521A GPS/ DGPS and older version MX521 antenna sensors. They were designed to work either interactively with MX Control and Display Unit (MX CDU) or as a stand-alone positioning device for other non-MX applications. The MX521A smart DGPS antennas can achieve better than 2-meter DGPS accuracy in areas with good beacon differential coverage and autonomous GPS accuracy better than 5 meters. When connected to an MX-CDU (i.e.
Supplied Equipment The following items are supplied with the MX521A Kit: Description MX521A GPS Sensor only Part Number 727050 or, MX521A DGPS Sensor 727051 Installation Manual 727011 The antenna cable assembly is not included and must be ordered separately. Please specify the cable length required.
2 Operation General The MX521A DGPS sensor is an integrated GPS and beacon receiver unit that is fully automatic and usually does not require user intervention in most cases. It will automatically search for available satellites as soon as power is applied. Not available with MX521A GPS only models. The internal 2-channel beacon receiver inititates an Automatic Beacon Search (ABS) on power on for the first time.
Manual for more details. Turning this feature ON in the MX420 CDU will initiate the MX521 to listen for and track any SBAS satellites that are in view. Receiver Autonomous Integrity Monitoring (RAIM) RAIM is a special software algorithm in the MX521A program which gives the operator timely warnings when the GPS system accuracy is questionable. This feature requires at least five or more GPS satellites to operate properly.
3 Installation MX521A Antenna Mounting Guidelines The MX521A antenna housing is weather-resistant and must be located outside where it will have a good view of the sky around it. Use a standard 1”-14 TPI bracket for mounting. •• Install the MX521A antenna where it has a clear view of the sky around it. •• Locate the antenna for easy access and maintenance. •• Stay away from high-power energy sources such as radar, SSB, INMARSAT and other transmitting radio antennas by 5 meters or more.
RADAR ANT. 10 m (m in.) INMARSAT ANT. MAIN MAST VHF OR MF ANT. .) (min eter 10 m MX ANT. 3m 1m 10 m MOUNT THE MX521/421 10 m (min.) FORWARD OF MAIN MAST MX521A Connector The 10-pin male connector located at the underside of the antenna unit provides the means to connect to external power and the data interface. Please refer to the chart below for the pin numbers, wire colors codes and signal assignments.
Antenna Mounting Bracket Mount The MX521A mounting thread is an industry standard fitting for VHF antenna mounting (1inch, 14 TPI). This enables the antenna to be mounted on a wide range of mounting brackets, including the swivel joints, commonly used for angled surface. Refer to the figure below for bracket mounting illustration. Hand-tighten the antenna onto the bracket until snug. Do not overtighten.
1/4 inch diameter hole on a horizontal mounting surface and drill the four mounting screw holes as shown. Fasten the antenna by using 2-mm size stainless steel metric screws (4 places). Use a marine grade caulking compound to seal between the mounting surface and the bottom of the antenna housing. Choose a location for the antenna that has a clear view of the sky. Make sure there are no major obstructions or metal fixtures in the immediate proximity to the antenna.
Antenna Cable Selection The antenna cable assembly for the MX521A antenna is not included in the kit and must be ordered separately. Several cable lengths are available in stock. To assist you in ordering the correct cable length, please refer to the antenna cable list below for cable description and part number.
Power Requirement External power supplied to the MX521A must be within 10.5-32 VDC for best operation. To protect the circuitry in the MX521A, the voltage level must be within these limits. Negative grounding is required. The MX521A draws less than 300 mA. at 12 VDC. An in-line fuse or circuit breaker rated at 2 amp. is recommended for overload protection. When the MX521A is connected to an MX control and display unit (CDU), the 12 VDC antenna power is supplied by the CDU unit.
MX521A Connector Configuration Refer to the diagram below for the POWER-DATA connector located at the underside of the MX521A : 1 10 5 6 2 3 4 9 7 8 Pin# Wire Signal Prpl/Gry Ext. RTCM IN10 Ext. RTCM IN+ 9 Purple 8 White Beacon Status Out +* 7 Yellow Beacon- Status Out -* 6 Green GPS Out + 5 Orange GPS Out 4 Brown MPM IN+ 3 Blue MPM IN Red + 9~32 VDC 2 1 Black Negative GND .
Data Interface to MX420/2 or MK12 CDU Use the diagram below to interface the MX521A to an MX420/2 or MK12 CDU.
Data Interface to MX420/8 or MX420/ AIS CDU Use the diagram below to interface the MX521A to an MX420/8 or MX420/AIS CDU. The external RTCM connection is optional.
Data Interface to PC or Other Navigation Systems The figure below shows the power and data output connections to the serial port of a PC or other navigation systems using a dB9 connector and a terminal strip (user supplied items).
MX521A Programming Cable TD(A) TD(B) RD(A) RD(B) GND +12V BLK RS232 RS422 10-pin Male Connector BRN BLU GRN ORG RED TO MX521 NEG +12-32VDC The programming cable is used for upgrading the software of the GPS and Beacon PCBs inside the MX521A smart antenna. The figure below shows the programming cable diagram and equipment setup. Please note that external 12 volt DC is required to power up the MX521A. Connect the red wire to +12 VDC and Black wire to negative GND.
Data Interface to MX5xx CDU Use the diagram below to interface the MX521A to an MX500, MX510 or MX512 CDU. Antenna cable assembly with two 10-Pin connectors are available in 3, 20 and 40 meter lengths. MX5xx CDU MX521 P/N 3508 102 70150 10-PIN CABLE ASSY.
4 Specifications GPS Receiver Type:............. L1, C/A Code (SPS) with carrier phase smoothing Frequency:........................................................ 1575.42 MHz Channels:...................................12 Channels, parallel tracking Update rate:.................................................................. 1 Hz RTCM Input: . ......................................... RTCM SC-104 format Satellite measurement use:.......... 12 channel parallel automatic selection Antenna type:............
Channel spacing:.........................................................500 Hz Frequency offset tolerance: ......................................... + 5 Hz Antenna type:............................................................ H-Field MSK rates:...............................................50, 100 and 200 bps Environmental Operating temperature:..................................... -30 to +70 °C Storage Temperature:.......................................... -40 to 85 °C Humidity:......................
102 mm 182 mm 1-14 TPI Simrad reserves the right to make changes in its products and specifications without notice.
Blank page 24 | Specifications
5 Data Output The MX521A data output conforms to the NMEA 0183 V3.0 at 4800 baud. Below is a list of the NMEA sentences output: GGA, GSA, GSV, GST, RMC, VTG and PMVXG,GBS (an MX proprietary sentence used for RAIM) NMEA 0183 Data Output Sentences (1) GGA - Global Positioning System Fix Data Time, position and fix related data for a GPS receiver. $GPGGA,hhmmss,llll.llll,a,yyyyy.yyyy,a,x,xx,x.x,x.x,M,x.x,M,x.
(2) GRS - GNSS Range Residual This message is used to support RAIM. $GPGRS,hhmmss,x,x.x,x.x,x.x,x.x,x.x,x.x,x.x,x.x,x.x,x.x,x.x,x.x*hh 1 2 3 Notes: 1 ---- UTC time of GGA or GNS fix associated with this sentence 2 ---- Mode 0 = residuals were used to calculate the position given in the matching GGA or GNS. 1 = residuals were computed after the GGA or GNS position was computed. 3 ---- Range residuals in meters for sat. used in navigation solution.
(4) GSV - GPS Satellite in View Number of satellites (SV) in view, PRN numbers, elevation, azimuth and SNR values. Four satellites maximum per transmission, additional satellite data sent in second or third message. Total number of messages being transmitted and the number of the message transmitted are indicated in the first two fields. $GPGSV,x,x,xx,xx,xx,xxx,xx,....................
5,6 -- Longitude, E/W 7 ---- Speed over ground, knots 8 ---- Course Over Ground, True 9 ---- Date: dd/mm/yy 10,11 - Magnetic variation, degrees E/W. Easterly variation (E) subtracts from True course, Westerly variation (W) adds to True course. (6) GST - GNSS Pseudorange Error Statistics This message is used to support Receiver Autonomous Integrity Monitoring (RAIM).
7 ---- Standard deviation of longitude error (meters) 8 ---- Standard deviation of altitude error (meters) (7) VTG - Course Over Ground and Ground Speed The actual course and speed relative to the ground. $GPVTG,x.x,T,x.x,M,x.x,N,x.
(9) GBS - GNSS Satellite Fault Detection (Modified MX version) This message is used to support Receiver Autonomous Integrity Monitoring (RAIM) feature in the MX420 CDU. A special character flag was added for proper RAIM status determination. $PMVXG,GBS,hhmmss.ss,x.x,x.x,x.x,xx,x.x,x.x,x.x,x*hh 1 2 3 4 5 6 7 8 9 Notes: 1 ----- UTC time of the GGA or GNS fix associated with this sentence.
How are we doing? Please help us to help you and our other valued customers by sending us your evaluation of this manual. We need to know such things as: -- is the manual complete, or do you need more (or less) information? -- can you find the information you need easily? -- is the information easy to understand, or could we be clearer? -- are there any errors and, if so, where and what are they? Be sure to reference the title and identification number of this manual. Please email your comments to: tech.
Blank page 32 | Data output
Doc.no.727052, Rev.
