Simrad HS80/MX575C User Manual

ENGLISH

HS80/MX575C

User Manual

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Preface | HS80 / MX575C User Manual

Preface

Disclaimer

As Navico is continuously improving this product, we retain the right to make changes to the
product at any time which may not be reflected in this version of the manual. Please contact
your nearest distributor if you require any further assistance.

It is the owner’s sole responsibility to install and use the equipment in a manner that will
not cause accidents, personal injury or property damage. The user of this product is solely
responsible for observing safe boating practices.

NAVICO HOLDING AS AND ITS SUBSIDIARIES, BRANCHES AND AFFILIATES DISCLAIM ALL
LIABILITY FOR ANY USE OF THIS PRODUCT IN A WAY THAT MAY CAUSE ACCIDENTS, DAMAGE
OR THAT MAY VIOLATE THE LAW.

Governing Language: This statement, any instruction manuals, user guides and other
information relating to the product (Documentation) may be translated to, or has been
translated from, another language (Translation). In the event of any conflict between any
Translation of the Documentation, the English language version of the Documentation will be
the official version of the Documentation.

This manual represents the product as at the time of printing. Navico Holding AS and its
subsidiaries, branches and affiliates reserve the right to make changes to specifications
without notice.

Compliance

The HS80 / MX575C systems complies with the following regulations:

• Marine Equipment Directive (MED) 2010/68/EU, and the last modification by Directive

2011 / 75/EU:

- HS80: Annex A.1 - 4.41 Transmitting heading device THD

- MX575: Annex A.1 - 4.41 Transmitting heading device THD

Annex A.1 - 4.14 GPS equipment
Annex A.1 - 4.50 DGPS equipment

See also “Certifications” on page 35,

For more information please refer to our website: pro.simrad-yachting.com.

The Wheelmark

The HS80 / MX575C systems are produced and tested in accordance with the European
Marine Equipment Directive 2010/68/EU. This means that the systems comply with the
highest level of tests for nonmilitary marine electronic navigation equipment existing today.

The Marine Equipment Directive 2010/68/EU (MED) for ships flying EU or EFTA flags applies to
all new ships, to existing ships not previously carrying such equipment, and to ships having
their equipment replaced.

This means that all system components covered by annex A1 must be type-approved
accordingly and must carry the Wheelmark, which is a symbol of conformity with the Marine
Equipment Directive.

Copyright

Copyright © 2012 Navico Holding AS.

Warranty

The warranty card is supplied as a separate document.

In case of any queries, refer to the our website: pro.simrad-yachting.com.

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Preface | HS80 / MX575C User Manual

About this manual

This manual is a reference guide for installing and using the HS80 / MX575C systems.

The latest available manual version can be downloaded from our web sites.

Important text that requires special attention from the reader is emphasized as follows:

¼ Note: Used to draw the reader’s attention to a comment or some important information.

Warning: Used when it is necessary to warn personnel that they

should proceed carefully to prevent risk of injury and/or damage to
equipment/personnel.

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Preface | HS80 / MX575C User Manual

Contents

4 Introduction

4 Overview
5 Parts list

6 Installation

6 Mounting location
8 Mounting orientation
9 Mounting options
15 Por t s
19 Powering the HS80/MX575C
20 Connecting the HS80/MX575C to external devices
21 Default parameters

22 Operation

22 GPS overview
23 HS80/MX575C overview
27 Common commands and messages

31 Troubleshooting

33 Technical specications

33 Specifications
35 Certifications
36 Output messages
42 Proprietary Input data messages

50 Wiring Diagrams

50 MX420 CDU to MX575C interface diagram
50 MX510/MX512 to MX575C interface diagram
51 HS80/MX575C interface via MX510 junction Box
52 MX512 to MX575C interface diagram via MX512 Junction Box
53 1PPS output of MX575C
53 PC to MX575C interface diagram

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Introduction | HS80/MX575C User Manual

Introduction

Overview

The HS80 GPS Compass and the MX575C DGPS Compass are based upon a new generation
GPS engine technology.

Figure 1-1: HS80/MX575C side view

¼ Note: When referring to both the HS80 GPS Compass and the MX575C DGPS Compass this

manual uses the term HS80/MX575C. When referring to either product, this manual uses
either HS80 or MX575C, respectively.

The HS/80/MX575C is a complete GPS compass and positioning system in a single enclosure
that requires only one power/data cable connection. With its NMEA 2000/NMEA 0183 support
and ease of installation, the HS80/MX575C is the perfect solution for marine applications.

The HS80/MX575C is an integrated system that houses the following:

- New GPS engine technology

- Dual GPS antennas

- DGPS beacon module and H-field beacon antenna (MX575C only)

- Power supply

- Single axis gyro

- Tilt sensor on each axis (X and Y axes)

The gyro and tilt sensors are present to improve system performance and to provide backup
heading information in the event that a GPS heading is not available due to signal blockage.

¼ Note: The HS80 GPS Compass is identical to the MX575C DGPS Compass with the exception

that it does not contain a DGPS beacon receiver and H-field antenna. If you purchased the
HS80 GPS Compass, disregard the sections of this manual that discuss the beacon signal,
receiver operation, and implications to installation relating to the beacon signal.

The new GPS engine technology supports multiple RF front ends - enabling tighter coupling
of measurements from separate antennas for use in heading-based products. Users will
achieve excellent accuracy and stability due to the more accurate code phase measurements,
improved multipath mitigation, and fewer components.

The HS80/MX575C GPS antennas are separated by 50 cm between their phase centers,
resulting in +/- 0.5° RMS heading performance. The HS80/MX575C provides heading and
positioning updates of up to 20 Hz and delivers positioning accuracy of +/- 1.0 m 95% of
the time when using differential GPS corrections from beacon (MX575C only) or from Space
Based Augmentation Systems (SBAS).

The HS80/MX575C also features the GPS’ exclusive COAST™ technology that enables the
GPS receivers to utilize old differential GPS correction data for 40 minutes or more without
significantly affecting the positioning quality. The HS80/MX575C is less likely to be affected
by differential signal outages due to signal blockages, weak signals, or interference when
using COAST.

1

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Introduction | HS80/MX575C User Manual

Parts list

¼ Note: The HS80/MX575C’s parts comply with IEC 60945 Section 4.4: “exposed to the weather.”

The sections below list parts included in your HS80 kit and the MX575C kit.

HS80 Parts list

Part Name Qty Part number

HS80 GPS Compass 1 000-10938-001

Serial-to-NMEA 2000 adapter 1 000-10941-001

Manual 1 988-10221-001

Kit containing the following:

• Clamp 1

• Screw 1

• Washer 1

Optional items

15 meter Power/data cable 000-10939-001

30 meter antenna cable 000-10940-001

MX575C Parts list

Part Name Qty Part number

MX575C DGPS Compass 1 000-10747-001

Power/data cable, 15 m 1 000-10939-001

Manual 1 988-10221-001

Kit containing the following:

• Clamp 1

• Screw 1

• Washer 1

Optional items

Serial-to-NMEA 2000 adapter 000-10941-001

30 meter antenna cable 000-10940-001

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Installation | HS80/MX575C User Manual

Installation

Mounting location

This section provides information on determining the best location for the HS80/MX575C.

GPS reception

When considering where to mount the HS80/MX575C, consider the following GPS reception
recommendations:

• Consider GPS (and hence SBAS) reception, ensuring there is a clear view of the sky available

to the HS80/MX575C so the GPS and SBAS satellites are not masked by obstructions that may
reduce system performance

• Since the HS80/MX575C computes a position based on the internal primary GPS antenna

element, mount the HS80/MX575C where you desire a position with respect to the primary
GPS antenna (located on the end opposite the recessed arrow on the underside of the
enclosure).

• Locate any transmitting antennas away from the GPS Compass by at least a few meters to

ensure tracking performance is not compromised, giving you the best performance possible

• Make sure there is enough cable length to route into the vessel to reach a breakout box or

terminal strip

• Do not locate the antenna where environmental conditions exceed those specified in

“Environmental spec” on page 34.

Beacon reception

When using the MX575C internal beacon receiver as the correction source, consider the
possible mounting locations from the perspective of ambient noise within the beacon band
(300 KHz).

Keep the following in mind when deciding upon a location with respect to maximizing
beacon performance:

• Ensure that the antenna is as far as possible from all other equipment that emits

electromagnetic interference (EMI) such as DC motors, alternators, solenoids, radio
transmitters, power cables, display units, and other electronic devices.

• If you are installing the antenna on a vessel, mount the MX575C considering maintenance

and accessibility. In addition, ensure that the antenna is not obscured by the metal mast, guy
wires or metal railings on the vessel.

• If radar(s) or INMARSAT system is present, mount the GPS Compass antenna outside the path

of the transmission beam.

The MX575C’s internal beacon receiver calculates a signal-to-noise ratio (SNR), measured in
decibels (dB) that indicates the receiver’s performance. The SNR is the height of the signal
above the noise floor: the higher the SNR, the better your beacon receiver demodulates the
signal. The optimum antenna location will be a position where your average SNR is highest.
You should turn on all accessories that you intend to use during normal operation when
locating the best position for the antenna. By monitoring the SNR, you can determine
the optimum location with respect to beacon reception. The SNR is available in the GPS6
(Beacon Status) screen of the MX CDU.

2

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Installation | HS80/MX575C User Manual

Environmental considerations

The HS80/MX575C is designed to withstand harsh environmental conditions; however,
adhere to the following limits when storing and using the GPS Compass:

• Operating temperature: -30°C to +70°C (-22°F to +158°F)

• Storage temperature: -40°C to +85°C (-40°F to +185°F)

• Humidity: 95% non-condensing

VHF interference

VHF interference from such devices as cellular phones and radio transmitters may interfere
with GPS operation. For example, if installing the HS80/MX575C near marine radios consider
the following:

• VHF marine radio working frequencies (Channels 1 to 28 and 84 to 88) range from 156.05 to

157.40 MHz. The GPS working center frequency is 1575.42 MHz. The bandwidth is +/- 2MHz to
+/- 10 MHz, which is dependent on the GPS antenna and receiver design

• VHF marine radios emit strong harmonics. The 10th harmonic of VHF radio, in some channels,

falls into the GPS working frequency band, which may cause the SNR of GPS to degrade
significantly

• The radiated harmonic signal strength of different brands/models varies.

• Follow VHF radio manufacturers’ recommendations on how to mount their radios and what

devices to keep a safe distance away.

• Handheld 5W VHF radios may not provide suitable filtering and may interfere with the HS80/

MX575C’s operation if too close.

Before installing the HS80/MX575C use the following diagram to ensure there are no nearby
devices that may cause VHF interference.

Use these minimum distances
to determine where to place
the HS80/MX575C

1.5 m radius at top
(minimum)

1.0 m radius at base (minimum)

VHF antenna

Figure 2-1: HS80/MX575C minimum distance from nearby VHF radios

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Installation | HS80/MX575C User Manual

Mounting orientation

The HS/80/MX575C outputs heading, pitch, and roll readings regardless of the orientation
of the antennas. However, the relation of the antennas to the boat’s axis determines
whether you will need to enter a heading, pitch, or roll bias. The primary antenna is used
for positioning and the primary and secondary antennas, working in conjunction, output
heading, pitch, and roll values.

¼ Note: Regardless of which mounting orientation you use, the HS80/MX575C provides the

ability to output the heave of the vessel. This output is available via the $GPHEV message.

Parallel orientation

The most common installation is to orient the HS80/MX575C parallel to, and along the
centerline of, the axis of the boat. This provides a true heading. In this orientation:

• If you use a gyrocompass, you can enter a heading bias in the HS80/MX575C to calibrate the

physical heading to the true heading of the vessel.

• You may need to adjust the pitch/roll output to calibrate the measurement if the Vector is not

installed in a horizontal plane.

Perpendicular orientation

You can also install the antennas so they are oriented perpendicular to the centerline of the
boat’s axis. In this orientation:

• You will need to enter a heading bias of +90° if the primary antenna is on the starboard side

of the boat and -90° if the primary antenna is on the port side of the boat.

• You will need to configure the receiver to specify the GPS antennas are measuring the roll axis

using $JATT,ROLL,YES.

• You will need to enter a roll bias to properly output the pitch and roll values.

• You may need to adjust the pitch/roll output to calibrate the measurement if the Vector is not

installed in a horizontal plane.

Figure 2-2 and Figure 2-3 provide mounting orientation examples.

Recessed arrow located on
the bottom of the enclosure

Forward motion

Figure 2-2: Recommended orientation and resulting signs of HPR values

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Installation | HS80/MX575C User Manual

Recessed arrow located on
the bottom of the enclosure

Forward motion

Figure 2-3: Alternate orientation and resulting signs of HPR values

HS80/MX575C alignment

The top of the HS80/MX575C enclosure incorporates sight design features to help you align
the enclosure with respect to an important feature on your vessel.

To use the sights, center the small post on the opposite side of the enclosure from you,
within the channel made in the medallion located in the center of the enclosure top as
shown in Figure 2-4 and Figure 2-5. Alignment accuracy when looking through the long
site (Figure 2-4) is approximately +/- 1°, while alignment through the short site (Figure 2-5) is
approximately +/- 2.5°.

Figure 2-4: Long sight alignment Figure 2-5: Short sight alignment

If you have another accurate source of heading data on your vessel, such as a gyrocompass,
you may use its data to correct for a bias in HS80/MX575C alignment within the HS80/
MX575C software configuration. Alternatively, you can physically adjust the heading of
the HS80/MX575C so that it renders the correct heading measurement; however, adding a
software offset is an easier process.

Mounting options

The HS80/MX575C allows for two different mounting options: flush mount and pole mount.

• Flush mount - The bottom of the HS80/MX575C contains eight M8-1.25 holes for flush

mounting the unit to a flat surface (see Figure 2-6). The eight holes comprise two sets of four
holes. The inner four holes are in the same location as the HS70, allowing you to use the HS80/
MX575C as a drop-in replacement. The outer four holes provide a wider mounting option.

• Pole mount - The bottom of the HS80/MX575C contains a mounting hole (1” thread, 0.9”

depth) for easy pole mounting. Hand tighten until snug (do not over tighten). The set screws
on the long sides of the base (see middle drawing in Figure 2-6) allow you to secure the HS80/
MX575C in place (3/16” Allen wrench not included).

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Installation | HS80/MX575C User Manual

HS80/MX575C dimensions

Figure 2-6 illustrates the physical dimensions of the HS80/MX575C.

Figure 2-6: HS80/MX575C dimensions

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Installation | HS80/MX575C User Manual

Power/Data cable considerations

Before mounting the HS80/MX575C consider the following regarding power/data cable
routing:

• Cable must reach an appropriate power source

• Cable may connect to a data storage device, computer, or other device that accepts GPS data

• Avoid running the cable in areas of excessive heat

• Keep cable away from corrosive chemicals

• Do not run the cable through door or window jams

• Keep cable away from rotating machinery

• Do not crimp or excessively bend the cable

• Avoid placing tension on the cable

• Remove unwanted slack from the cable at the HS80/MX575C end

• Secure along the cable route using plastic wraps

Warning: Improperly installed cable near machinery can be

dangerous.

Mounting the HS80/MX575C

This section describes how to flush mount or pole mount the HS80/MX575C. Keep the
following in mind when planning your installation:

• SIMRAD does not supply mounting surface hardware or a mounting pole. You must supply

the appropriate hardware or mounting pole required to complete HS80/MX575C installation.

• You do not necessarily need to orient the antenna precisely as you can enter a software offset

to accommodate for a heading measurement bias due to installation.

Flush mounting the HS80/MX575C

The bottom of the HS80/MX575C contains eight holes (two sets of four holes) for flush
mounting the unit to a flat surface (Figure 2-7). The flat surface may be something you
fabricate per your installation, an off-the-shelf item (such as a radar mounting plate), or an
existing surface on your vessel.

Figure 2-7: Flush mounting holes on bottom of HS80/MX575C

Complete the following steps to flush mount the HS80/MX575C:

1. Determine the desired location and proper orientation for the HS80/MX575C.

See “Mounting orientation” on page 8 for information on determining the desired
orientation.

2. Use the supplied template or photocopy the section of the HS80/MX575C that contains

the eight mounting holes (see Figure 2-7) for use as a template to plan the mounting hole
locations. Use the inner four holes or the outer four holes per your installation.

If using a photocopy make sure it is scaled one-to-one with the mounting holes on the
bottom of the HS80/MX575C.

3. Mark the mounting hole centers on the mounting surface.

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Installation | HS80/MX575C User Manual

4. Place the HS80/MX575C over the marks to ensure the planned hole centers align with the

true hole centers (adjusting as necessary).

5. Use a center punch to mark the hole centers.

6. Drill the mounting holes with a 9 mm bit appropriate for the surface.

7. Place the HS80/MX575C over the mounting holes and insert the mounting screws through

the bottom of the mounting surface into the HS80/MX575C.

Warning: When installing the HS80/MX575C, hand tighten only.

Damage resulting from over tightening is not covered by the warranty.

Pole mounting the HS80/MX575C

If you need the GPS-assisted roll measurement, install the HS80/MX575C perpendicular to the
vessel’s axis. If you do not need this measurement, install the HS80/MX575C parallel with the
vessel’s axis. For more information refer to Figure 2-2 on page 8 and Figure 2-3 on page

9.

Complete the following steps to pole mount the HS80/MX575C:

1. Determine the desired location and proper orientation for the HS80/MX575C. See “Mounting

orientation” on page 8“ for information on determining the desired orientation.

2. Hand tighten the HS80/MX575C on the pole until snug (unit is stable on pole) while ensuring

correct orientation.

Warning: Hand tighten only. Damage resulting from over tightening

is not covered by the warranty.

3. Use the set screws on the long sides of the base (see Figure 2-6 on page 10) to secure the

HS80/MX575C in place (3/16” Allen wrench not included).

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Installation | HS80/MX575C User Manual

Connecting the serial cable or Serial-to-NMEA 2000 adapter to the HS80/
MX575C

After you mount the HS80/MX575C connect either the serial power/data cable or the serial­to-NMEA 2000 adapter to the HS80/MX575C.

Connecting the serial Power/Data cable

1. Align the cable connector keyway with the HS80/MX575C connector key

Connect cable here

2. Rotate the cable ring clockwise until it locks. The Locking action is firm; you will feel a positive

“click” when it has locked.

Cable ring

Cable connector keyway Connector key

3. Attach the power/data cable to the cable clamp.

4. Fasten the clamp to the bottom of the HS80/MX575C using the screw and washer.

5. Attach the cable cover.

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Installation | HS80/MX575C User Manual

Connecting the Serial-to-NMEA 2000 adapter

For more information on the serial-to-NMEA 2000 adapter see “NMEA 2000 port” on page

16. This adapter is an optional item for the MX575C model.

1. Align the adapter connector keyway with the HS80/MX575C connector key.

Connect adapter

here

2. Rotate the cable ring clockwise until it locks. The locking action is firm; you will feel a positive

“click” when it has locked.

Cable ring

Cable connector keyway Connector key

3. Fasten the adapter to the body of the HS80/MX575C using the provided screws and the two

slots in the adapter.

4. Attach the cable cover.

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Installation | HS80/MX575C User Manual

Ports

The HS80/MX575C offers either NMEA 0183 serial port or NMEA 2000 port functionality.

Serial ports

The HS80/MX575C has three ports (Port A, Port B, and Port C), where:

• Port A can be both full-duplex RS-232 and half-duplex RS-422 (transmit only)

• Port B is full-duplex RS-422

• Port C is for NMEA 2000 and only available via serial-to-NMEA 2000 adapter

You can receive external differential corrections via either Port A (full-duplex RS-232) or Port
B (full-duplex RS-422). You can connect up to three devices at one time using two ports. One
device can receive data via Port A (RS-422 transmit only) while two devices can transmit and
receive data via Ports A and B (one connected to Port A RS-

232 and one connected to Port B).

¼ Notes:

1. Port A (RS-422) or Port B is required for communicating to an IMO-approved device.

2. You can update firmware via Port A (RS-232) or Port B.

¼ Note: The MX575C has maximum baud rate of 38400. Higher baud rates may impair beacon

signal tracking.

Serial port conguration

You may configure Port A or Port B of the GPS receiver to output any combination of data.
Port A can have a different configuration from Port B in terms of data message output, data
rates, and the baud rate of the port. This allows you to configure the ports independently
based upon your needs.

For example, if you want one generalized port and one heading-only port, you can configure
the ports as follows:

• Port A to have GPGGA, GPVTG, GPGSV, GPZDA, and GPHDT all output at 1 Hz over a 9600

baud rate.

• Port B for GPHDT and GPROT message output at their maximum rate of 20

Hz over a 19200 baud rate.

The messages you configure each port to output and the rate of the port will be the same
for both RS-232 and RS-422 interface levels. For example, the RS-232 Port A and RS-422 Port A
output the same data messages at the same baud rate. If the baud rate or messages for the
RS-422 port need to be changed, this needs to be commanded through the RS-232 port.

Both RS-232 and RS-422 output signals may be used simultaneously.

¼ Note: For successful communications use the 8-N-1 protocol and set the baud rate of the

HS80/MX575C’s serial ports to match that of the devices to which they are connected. Flow
control is not supported.

Selecting Baud rates and message types

When selecting your baud rate and message types use the following formula to calculate
the bits/sec for each message and then sum the results to determine the baud rate for your
required data throughput.

Message output rate * Message length (bytes) * bits in byte = Bits/second

(1 character = 1 byte, 8 bits = 1 byte, use 10 bits/byte to account for overhead)

See “Common commands and messages” on page 27 for an example of this calculation.

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Installation | HS80/MX575C User Manual

Recommendations for connecting to other devices

When interfacing to other devices, ensure the transmit data output from the HS80/MX575C is
connected to the data input of the other device. The signal grounds must also be connected.

Since RS-422 is a balanced signal with positive and negative signals referenced to ground,
ensure you maintain the correct polarity. For example, when connecting the transmit data
output positive signal to the receive line of the other device, it should be connected to the
receive positive terminal. The negative transmit data signal from the HS80/MX575C is then
connected to the receive data negative input of the other device.

There is likely little reason to connect the receive data input of the HS80/MX575C to another
device unless it is able to send configuration commands to the HS80/MX575C. Since the
HS80/MX575C uses proprietary NMEA 0183 commands for control over its configuration, the
vast majority of electronics will not be able to configure its settings unless the other device
has a terminal setting where you can manually issue commands.

NMEA 2000 port

To use the HS80 for NMEA 2000 interface, you need to use the Serial-to-NMEA 2000 adapter
(P/N 710-0113-000#, see Figure 2-8). This adapter is optional item for the MX575C model.
Insert the 18-pin connector of the adapter into the male end of the 18-pin connector on the
HS80 by aligning the keys. You can then attach the adapter to the unit using the supplied
screws (machine, 8-32, ½”, PPHC, SS) and washer (washer, flat, #8, SS). The 5-pin male Micro-C
connector connects to your NMEA 2000 drop cable.

Micro-C connector

18-pin Female

connector

Figure 2-8: Serial-to-NMEA 2000 adapter

The MX575C DGPS compass model is supplied with 15 meter interface cable for NMEA 0183
interface connection. An optional 30-meter NMEA 0183 interface cable can be ordered
separately. The NMEA 2000 interface adapter is another option for the MX575C.

¼ Note: The serial-to-NMEA 2000 adapter is not an IMO requirement and may not be used in

such an application.

The next section shows the requested PGNs with the HS80/MX575C in NMEA 2000 mode.

Received messages based on a request

PG No.

(PGN)

Description Level

Default Update

Rate (msec)

Freq (Hz)

059392 ISO Acknowledgement

Used to acknowledge the status
of certain requests addressed to a
specific ECU.

B On Request On Request

059904 ISO Request

Request the transmission of a specific
PGN, addressed or broadcast.

B On Request On Request

060928 ISO Address Claim

Used to identify to other ECUs the
address claimed by an ECU.

B On Request On Request

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Installation | HS80/MX575C User Manual

126996 Product Information

NMEA 2000 database version
supported, manufacturer’s product
code, NMEA 2000 certification level,
Load Equivalency number, and other
product- specific information.

B On Request On Request

126464 Receive/Transmit PGNs group

function
The Transmit / Receive PGN List
Group type of function is defined
by first field. The message will be a
Transmit or Receive PGN List group
function.

B On Request On Request

129538 GNSS Control Status

GNSS common satellite receiver
parameter status.

B On Request On Request

129545 GNSS RAIM Output

Used to provide the output
from a GNSS receiver’s Receiver
Autonomous Integrity Monitoring
(RAIM) process. The Integrity field
value is based on the parameters set
in PGN 129546 GNSS RAIM Settings.

B On Request On Request

129546 GNSS RAIM Settings

Used to report the control
parameters for a GNSS Receiver
Autonomous Integrity Monitoring
(RAIM) process.

B On Request On Request

The next section shows the transmitted PGNs with their default update rate with the HS80/
MX575C in NMEA 2000 mode.

Transmitted messages

PG No.

(PGN)

Description Level

Default Update

Rate (msec)

Freq (Hz)

126992 System Time

The purpose of this PGN is twofold:
To provide a regular transmission
of UTC time and date. To provide
synchronism for measurement data.

B 1000 1

127250 Vessel Heading

Heading sensor value with a flag for
True or Magnetic. If the sensor value
is Magnetic, the deviation field can be
used to produce a Magnetic heading,
and the variation field can be used
to correct the Magnetic heading to
produce a True heading.

B 100 10

127251 Rate of Turn

Rate of change of the Heading.

B 100 10

127257 Attitude

Provides a single transmission that
describes the position of a vessel
relative to both horizontal and vertical
planes. This would typically be used
for vessel stabilization, vessel control
and onboard platform stabilization.

B 1000 1

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Installation | HS80/MX575C User Manual

PG No.

(PGN)

Description Level

Default Update

Rate (msec)

Freq (Hz)

127258 Magnetic Variation

Message for transmitting variation.
The message contains a sequence
number to allow synchronization
of other messages such as Heading
or Course over Ground. The quality
of service and age of service are
provided to enable recipients to
determine an appropriate level of
service if multiple transmissions exist.

1000 1

129025 Position, Rapid Update

Provides latitude and longitude
referenced to WGS84. Being defined
as single frame message, as opposed
to other PGNs that include latitude
and longitude and are defined as
fast or multi- packet, this PGN lends
itself to being transmitted more
frequently without using up excessive
bandwidth on the bus for the benefit
of receiving equipment that may
require rapid position updates.

B 100 10

129026 COG & SOG, Rapid Update

Single frame PGN that provides
Course Over Ground (COG) and Speed
Over Ground (SOG).

B 250 4

129027 Position Delta, High Precision Rapid

Update
The “Position Delta, High Precision
Rapid Update” Parameter Group is
intended for applications where very
high precision and very fast update
rates are needed for position data.
This PGN can provide delta position
changes down to 1 mm with a delta
time period accurate to 5 msec.

B 100 10

129028 Altitude Delta, High Precision Rapid

Update
The “Altitude Delta, High Precision
Rapid Update” Parameter Group is
intended for applications where very
high precision and very fast update
rates are needed for altitude and
course over ground data. This PG can
provide delta altitude changes down
to 1 millimeter, a change in direction
as small as 0.0057°, and with a delta
time period accurate to 5 msec.

B 100 10

129029 GNSS Position Data

Conveys a comprehensive set of
Global Navigation Satellite System
(GNSS) parameters, including position
information.

B 1000 1

129033 Time & Date

Single transmission that provides UTC
time, UTC Date, and Local Offset.

B 1000 1

| 19

Installation | HS80/MX575C User Manual

PG No.

(PGN)

Description Level

Default Update

Rate (msec)

Freq (Hz)

129539 GNSS DOPs

Provides a single transmission
containing GNSS status and dilution
of precision components (DOP) that
indicate the contribution of satellite
geometry to the overall positioning
error. There are three DOP parameters
reported: horizontal (HDOP), Vertical
(VDOP), and time ( TDOP).

B 1000 1

129540 GNSS Sats in View

GNSS information on current satellites
in view tagged by sequence ID.
Information includes PRN, elevation,
azimuth, SNR, defines the number of
satellites; defines the satellite number
and the information.

B 1000 1

Powering the HS80/MX575C

Power considerations

For best performance use a clean and continuous 12-24 VDC power supply. The HS80/
MX575C power supply circuit features reverse polarity protection but will not operate with
reverse polarity.

See “Power” on page 34 for complete power specifications.

Connecting to a power source

¼ Note: This section refers to powering the MX575C unit via the serial cable connection. The

HS80 power is taken from the NMEA 2000 main buss. Follow the standard procedure for
powering up via NMEA 2000.

Before you power up the HS80/MX575C you must terminate the wires of the power cable as
required. There are a variety of power connectors and terminals on the market from which to
choose, depending on your specific requirements.

Warning: Do not apply voltage higher than 36 VDC. This will damage the receiver and void the
warranty.

To interface the HS80/MX575C power cable to the power source:

• Connect the red wire of the cable’s power input to DC positive (+)

• Connect the black wire of the cable’s power input to DC negative (-)

The HS80/MX575C will start when an acceptable voltage is applied to the power leads of the
extension cable.

Electrical isolation

The HS80/MX575C’s power supply circuit is isolated from the communication lines and the
PC-ABS plastic enclosure isolates the electronics mechanically from the vessel (addressing the
issue of vessel hull electrolysis).

20 |

Installation | HS80/MX575C User Manual

Connecting the HS80/MX575C to external devices

¼ Note: This section refers to a serial connection. For connecting external NMEA 2000 devices,

plug the serial-to-NMEA 2000 adapter into the HS80 and then attach a standard NMEA 2000
drop line cable to the adapter.

¼ Note: The NMEA (N2K) adapter is not included as standard accessory of the MX575C model.

Power/Data cable considerations

The MX575C uses a single 15 m (49 ft) or optional 30 m (98 ft) cable for power and data input/
output. This cable is optional for HS80

J1

50 mm

P1

Cover drain wire

with black shrink

tube

Shrink tubes

15 m / 30 m

100 mm

Figure 2-9: Power/Data cable, 15m or 30m

The receiver end of the cable is terminated with an environmentally sealed 18-pin connector
while the opposite end is not terminated and requires field stripping and tinning.

Depending on the application and installation needs, you may need to shorten this cable.
However, if you require a longer cable run than 30 m, you can bring the cable into a break-out
box that incorporates terminal strips.

When lengthening the cable keep the following in mind:

• To lengthen the serial lines inside the vessel, use 20-gauge twisted pairs and minimize the

additional wire length.

• When lengthening the power input leads to the HS80/MX575C, ensure the additional voltage

drop is small enough that your power system can continue to power the system above the
minimum voltage of the system. Wire of 18-gauge or larger should also be used.

• Minimize RS-232 cable length to ensure reliable communication.

• Use similar color-coded wires whenever possible.

| 21

Installation | HS80/MX575C User Manual

Power/Data cable pin out specications

Figure 2-10 shows the power/data cable pin out, and the table shows the cable’s pin out
specifications.

Figure 2-10: Power/data cable pin assignment

Pin Function Wire Color

1 Power (+) Red

2 Power (-) Black

3 Port A Tx RS-232 Blue

4 Port A Rx RS-232 Black/blue stripe

5 Reserved

6 Port A Tx RS-422(+) Green

7 Port B Rx RS-422(+) Brown

8 Port B Rx RS-422(-) Black/brown stripe

9 Reserved

10 Drain Bare wire

11 Port A Tx RS-422(-) Green/black stripe

12 Signal ground Grey

13 Alarm White

14 Alarm White/red stripe

15 1 PPS(+) Orange

16 Port B Tx RS-422(+) Yellow

17 Port B Tx RS-422(-) Yellow/black stripe

18 1 PPS(-) Orange/black stripe

Default parameters

The table below provides details on certain default parameters. Contact your dealer for
default port settings for your unit.

¼ Note: Use the $JSAVE command to save changes you make to the HS80/MX575C’s

configuration for the changes to be present in subsequent power cycles.

Unit Parameter Specification

HS80 and MX575C

Max DGPS age (correction age) 2700 seconds

Elevation mask 5°

Differential mode

HS80: SBAS
MX575C: Beacon

MX575C (internal beacon
parameters)

Frequency selection Automatic

MSK rate selection Automatic

22 |

Operation | HS80/MX575C User Manual

Operation

GPS overview

For your convenience, both the GPS and SBAS operation of the HS80/MX575C features
automatic operational algorithms. When powered for the first time, the HS80/MX575C
performs a ‘cold start’ that involves acquiring the available GPS satellites in view and the SBAS
differential service for HS80 and beacon DGPS service for the MX575C.

If SBAS is not available in your area, an external source of RTCM SC-104 differential corrections
may be used. If you use an external source of correction data, it must support an eight data
bit, no parity, one stop bit configuration (8-N-1).

GPS operation

The GPS receiver is always operating, regardless of the DGPS operation mode. The following
sections describe general operation of the HS80/MX575C’s internal GPS receiver.

¼ Note: Differential source and status have no impact on heading, pitch, or roll. They only have

an impact on positioning and heave.

Automatic tracking

The HS80/MX575C’s internal GPS receiver automatically searches for GPS satellites, acquires
the signals, and manages the navigation information required for positioning and tracking.

Receiver performance

The HS80/MX575C works by finding four or more GPS satellites in the visible sky. It uses
information from these satellites to compute a position within 4.0 m. Since there is some
error in the GPS data calculations, the HS80/MX575C also tracks a differential correction. The
HS80/MX575C uses these corrections to improve its position accuracy to better than 1.0 m.

The two main aspects of GPS receiver performance are 1) satellite acquisition, and 2)
positioning and heading calculation.

When the HS80/MX575C is properly positioned, the satellites transmit coded information to
the antennas on a specific frequency. This allows the receiver to calculate a range to each
satellite from both antennas. GPS is essentially a timing system. The ranges are calculated
by timing how long it takes for the signal to reach the GPS antenna. The GPS receiver uses a
complex algorithm incorporating satellite locations and ranges to each satellite to calculate
the geographic location and heading. Reception of any four or more GPS signals allows the
receiver to compute three-dimensional coordinates and a valid heading.

Dierential operation

The purpose of differential GPS (DGPS) is to remove the effects of selective availability (SA),
atmospheric errors, timing errors, and satellite orbit errors, while enhancing system integrity.
Autonomous positioning capabilities of the HS80/MX575C will result in positioning accuracies
of 4.0 m 95% of the time. In order to improve positioning quality to better than 1.0 m 95%,
the HS80/MX575C is able to use differential corrections received through the internal SBAS
demodulator or beacon receiver, or through externally-supplied RTCM corrections.

Automatic SBAS tracking

The HS80 automatically scans and tracks SBAS signals without the need to tune the receiver.
The HS80 features two-channel tracking that provides an enhanced ability to maintain a lock
on an SBAS satellite when more than one satellite is in view. This redundant tracking approach
results in more consistent tracking of an SBAS signal in areas where signal blockage of a
satellite is possible. The MX575C is configured to receive beacon DGPS corrections. However,
it can also be configured to receive SBAS or external RTCM corrections from the SIMRAD-MX
CDU.

3

| 23

Operation | HS80/MX575C User Manual

Beacon operation

Many marine authorities, such as the U.S. coast guard, have installed networks of radio beacon
stations that broadcast DGPS corrections to users of this system. With the increasing utility of
these networks for terrestrial applications, there is an increasing trend toward densification
of these networks inland. The dual channel beacon receiver in the MX575C can operate in
manual or automatic tuning mode, or, using database mode, will select the closest station
in compliance with IEC 61108-4 standards. The MX575C is configured to receive DGPS
corrections from beacon stations by default.

HS80/MX575C overview

The HS80/MX575C provides accurate and reliable heading and position information at
high update rates. To accomplish this task, the HS80/MX575C uses a high performance GPS
receiver and two antennas for GPS signal processing. One antenna is designated as the
primary GPS antenna and the other is the secondary GPS antenna. Positions computed by the
HS80/MX575C are referenced to the phase center of the primary GPS antenna. Heading data
references the vector formed from the primary GPS antenna phase center to the secondary
GPS antenna phase center.

The heading arrow located on the bottom of the HS80/MX575C enclosure defines system
orientation. The arrow points in the direction the heading measurement is computed (when
the antenna is installed parallel to the fore-aft line of the vessel). The secondary antenna is
directly above the arrow.

Fixed baseline moving base station RTK

The HS80/MX575C’s internal GPS receiver uses both the L1 GPS C/A code and carrier phase
data to compute the location of the secondary GPS antenna in relation to the primary GPS
antenna with a very high sub-centimeter level of precision. The technique of computing
the location of the secondary GPS antenna with respect to the primary antenna, when the
primary antenna is moving, is often referred to as moving base station Real Time Kinematic
(or moving base station RTK).

Generally, RTK technology is very sophisticated and requires a significant number of possible
solutions to be analyzed where various combinations of integer numbers of L1 wavelengths
to each satellite intersect within a certain search volume. The integer number of wavelengths
is often referred to as the “ambiguity” as they are initially ambiguous at the start of the RTK
solution.

The HS80/MX575C restricts the RTK solution. It does this knowing that the secondary GPS
antenna is 50 cm from the primary GPS antenna. This is called a fixed baseline and it defines
the search volume of the secondary antenna as the surface of a sphere with radius 50 cm
centered on the location of the primary antenna (see Figure 3-1).

Primary Antenna

50 cm

Baseline

Figure 3-1: Secondary antenna’s search volume

¼ Note: The HS80/MX575C moving base station algorithm only uses GPS to calculate heading.

Differential corrections are not used in this calculation and will not affect heading accuracy.

24 |

Operation | HS80/MX575C User Manual

Supplemental sensors

The HS80/MX575C has three supplemental sensors (gyro and two tilt sensors) that are
integrated into the unit’s main PCB. The supplemental sensors are enabled by default. You
can enable/disable the gyro and both tilt sensors (you cannot enable/disable each tilt sensor
separately).

The sensors act to reduce the RTK search volume, which improves heading startup and re­acquisition times. This improves the reliability and accuracy of selecting the correct heading
solution by eliminating other possible, erroneous solutions.

Sensor operation summary

Feature Normal Operation Coasting (no GPS)

Heading GPS Gyro

Heave GPS None

Pitch GPS Inertial tilt sensor

Roll Inertial sensor Inertial tilt sensor

Tilt aiding

The HS80/MX575C’s accelerometers (internal tilt sensors) are factory calibrated and enabled
by default. This constrains the RTK heading solution beyond the volume associated with
just a fixed antenna separation. This is because the HS80/MX575C knows the approximate
inclination of the secondary antenna with respect to the primary antenna. The search space
defined by the tilt sensor will be reduced to a horizontal ring on the sphere’s surface by
reducing the search volume.

This considerably decreases instances of incorrect headings as well as startup and
reacquisition times (see Figure 3-2).

Tilt angle

Figure 3-2: HS80/MX575C’s tilt aiding

| 25

Operation | HS80/MX575C User Manual

Gyro aiding

The HS80/MX575C’s internal gyro offers several benefits. It reduces the sensor volume for
an RTK solution. This shortens reacquisition times when a GPS heading is lost because the
satellite signals were blocked. The gyro provides a relative change in angle since the last
computed heading, and, when used in conjunction with the tilt sensor, defines the search
space as a wedge-shaped location (see Figure 3-3).

Figure 3-3: HS80/MX575C’s gyro aiding

The gyro aiding accurately smooth the heading output and the rate of turn. It provides a
substitute heading for a short period, accurate to within 1º per minute for up to three
minutes, in times of GPS loss for either antenna. If the outage lasts longer than three minutes,
the gyro will have drifted too far and the HS80/MX575C begins outputting null fields in the
heading output messages. There is no user control over the timeout period of the gyro.

Calibration, which is set at the factory, is required for the gyro to remove latency from the
heading solution as well as provide backup heading when GPS is blocked. The receiver
will calibrate itself after running for a while but it may be important to follow the manual
calibration instructions if you want to guarantee performance quickly after powering up the
receiver.

The gyro initializes itself at power up and during initialization. There is no need for manual
calibration. When the gyro is first initializing, it is important that the dynamics that the
gyro experiences during this warm up period are similar to the regular operating dynamics.
For example, if you use the HS80/MX575C on a high speed, maneuverable craft, it is
recommended that when gyro aiding in the HS80/MX575C is first turned on, use it in an
environment that has high dynamics for the first five to ten minutes instead of sitting
stationary.

With the gyro enabled, the gyro is also used to update the post HTAU smoothed heading
output from the moving base station RTK GPS heading computation. This means that if the
HTAU value is increased while gyro aiding is enabled, there will be little to no lag in heading
output due to vehicle maneuvers.

Time constants

The HS80/MX575C incorporates user-configurable time constants that can provide a degree
of smoothing to the heading, pitch, rate of turn (ROT), course over ground (COG), and speed
measurements. You can adjust these parameters depending on the expected dynamics of
the vessel. For example, increasing the time is reasonable if the vessel is very large and is not
able to turn quickly or would not pitch quickly. The resulting values would have reduced
‘noise,’ resulting in consistent values with time. However, if the vessel is quick and nimble,
increasing this value can create a lag in measurements. The level of smoothing maybe
adjusted manually but if you are unsure on how to set this value, it is best to be conservative
and leave it at the default setting.

¼ Note: For heading and rate of turn there is no lag once the gyro is calibrated and enabled.

26 |

Operation | HS80/MX575C User Manual

Heading time constant

Use the $JATT,HTAU command to adjust the level of responsiveness of the true heading
measurement provided in the $GPHDT message. The default value of this constant is 10.0
seconds of smoothing when the gyro is enabled. The gyro is enabled by default, but can be
turned off. By turning the gyro off, the equivalent default value of the heading time constant
would be 0.5 seconds of smoothing. This is not automatically done and therefore you must
manually enter it. Increasing the time constant increases the level of heading smoothing and
increases lag only if the gyro is disabled.

Pitch time constant

Use the $JATT,PTAU command to adjust the level of responsiveness of the pitch
measurement provided in the $PSAT,HPR message. The default value of this constant is 0.5
seconds of smoothing. Increasing the time constant increases the level of pitch smoothing
and increases lag.

Rate of Turn (ROT ) time constant

Use the $JATT,HRTAU command to adjust the level of responsiveness of the ROT
measurement provided in the $GPROT message. The default value of this constant is 2.0
seconds of smoothing. Increasing the time constant increases the level of ROT smoothing.

Course Over Ground (COG) time constant

Use the $JATT,COGTAU command to adjust the level of responsiveness of the COG
measurement provided in the $GPVTG message. The default value of this constant is 0.0
seconds of smoothing. Increasing the time constant increases the level of COG smoothing.
COG is computed using only the primary GPS antenna and its accuracy depends upon the
speed of the vessel (noise is proportional to 1/speed). This value is invalid when the vessel
is stationary, as tiny movements due to calculation inaccuracies are not representative of a
vessel’s movement.

Speed time constant

Use the $JATT,SPDTAU command to adjust the level of responsiveness of the speed
measurement provided in the $GPVTG message. The default value of this constant is

0.0 seconds of smoothing. Increasing the time constant increases the level of speed
measurement smoothing.

Alarm functionality

¼ Note: Alarm functionality is only valid for serial communication.

A relay is located on the Transmit Heading Device (THD) circuit board. The relay contacts are
isolated from all circuitry in the THD. The THD is connected to the coil side of the relay, but
not to the contacts that are connected to the external pins through the main IO connector. If
the THD loses power or heading, the coil voltage is lost and the relay opens and activates the
notification method employed by the user. When the heading is output, the relay contacts
remain closed, completing the circuit as an indication that the HS80/MX575C is operational.

¼ Note: Alarm pins must be connected to an IMO type-approved device.

Alarm signal

There are two wires (24 AWG multi-strands) on the output cable that are used for the external
alarm function. The color codes for the two wires are white and white/red stripe and are the
output of a relay. When this relay closes, the connection is complete on the user-defined
external notification device.

Watchdog

The watchdog is a timer that is controlled by the software that monitors if the heading is lost.
The watchdog software is compliant with IEC 60495.

| 27

Operation | HS80/MX575C User Manual

Common commands and messages

¼ Note: When selecting your baud rate and message types use the following formula and

example to calculate the bits/sec for each message and then sum the results to determine
the baud rate for your required data throughput. Transmitting the commands listed
in “Commands” on page 27 and monitoring the messages in “NMEA 0183 and other
messages” on page 28 requires that the PC serial communication port be connected to
the RS-232 interface wires of the 18-Pin antenna cable of the MX575C (see “PC to MX575C
interface diagram” on page 53). The HS80 requires this optional cable.

Message output rate * Message length (bytes) * bits in byte = Bits/second

(1 character = 1 byte, 8 bits = 1 byte, use 10 bits/byte to account for overhead)

Example:

Message Rate Bytes Bits in byte Bits/sec

GPHDT 10 20 10 2000

GPROT 5 18 10 900

GPHDG 1 33 10 330

GPGGA 1 83 10 830

GPZDA 1 38 10 380

Total 4440

The next sections provides brief descriptions of common commands and messages for the
HS80/MX575C.

Commands

Command Description

$GPMSK Tune beacon to specific frequency

$JAGE

Specify maximum DGPS (COAST) correction age (6 to 8100
seconds)

$JAPP Query or specify receiver application firmware

$JASC

Specify ASCII messages to output to specific ports (see
ASCII messages in Table 3-3)

$JBAUD Specify RS-232, RS-422 (output) communication rate

$JBIN

Specify binary messages to output to specific ports (see
Table 3-4)

$JDIFF Query or specify differential correction mode

$JGEO

Query or specify SBAS for current location and SBAS
satellites

$JI Query unit’s serial number and firmware versions

$JOFF Turn off all data messages

$JQUERY,GUIDE Query accuracy suitability for navigation

28 |

Operation | HS80/MX575C User Manual

Command Description

$JRESET

Reset unit’s configuration to firmware defaults

¼ Note: $JRESET clears all parameters. For the HS80/

MX575C you will have to issue the $JATT, FLIPBRD, YES
command to properly redefine the circuitry orientation
inside the product once the receiver has reset. Failure to
do so will cause radical heading behavior.
You can also issue the $JRESET command with an
optional field as follows:

• $JRESET,ALL does everything $JRESET does, plus it

clears almanacs

• $JRESET,BOOT does everything $JRESET,ALL does, plus

clears use of the real-time clock at startup, clears use
of backed-up ephemeris and almanacs, and reboots
the receiver when done

$JSAVE Save session’s configuration changes

In Table 3-3 the Info Type value is one of the following:

- P = Position

- V = Velocity, Time

- H = Heading, Attitude

- S = Sats, Stats, Quality

NMEA 0183 and other messages

Message

Info

Type

Max Output

Rate

Description

IEC Approved

Message

$GPDTM P 1 Hz Datum reference Yes

$GPGGA P 20 Hz GPS position and fix data Yes

$GPGLL P 20 Hz Geographic position - lat/long Yes

$GPGNS P 20 Hz GNSS position and fix data Yes

$GPGRS S 1 Hz GNSS range residual (RAIM) Yes

$GPGSA S 1 Hz GNSS DOP and active satellites Yes

$GPGST S 1 Hz

GNSS pseudo range error
statistics and position accuracy

Yes

$GPGSV S 1 Hz GNSS satellites in view Yes

*$GPHDG H 20 Hz

Provides magnetic deviation
and variation for calculating
magnetic or true heading

*see last bullet in Note at end
of this table

Yes

*$GPHDM H 20 Hz

Magnetic heading (based
on GPS-derived heading and
magnetic declination)

*see last bullet in Note at end
of this table

No

*$GPHDT H 20 Hz

GPS-derived true heading
*see last bullet in Note at end
of this table

Yes

$GPHEV H 20 Hz Heave value (in meters) Yes

| 29

Operation | HS80/MX575C User Manual

$GPRMC P 20 Hz

Recommended minimum
specific GNSS data

Yes

*$GPROT H 20 Hz

GPS-derived rate of turn (ROT)
*see last bullet in Note at end
of this table

Yes

$GPRRE S 1 Hz

Range residual and estimated
position error

Yes

$GPVTG V 20 Hz COG and ground speed Yes

$GPZDA V 20 Hz Time and date Yes

$PASHR H 20 Hz

Time, heading, roll, and pitch
data in one message

No

$PSAT,GBS S 1 Hz Satellite fault detection (RAIM) Yes

$PSAT,HPR H 20 Hz

Proprietary NMEA message
that provides heading,
pitch, roll, and time in single
message

No

$PSAT,INTLT H 1 Hz

Proprietary NMEA message
that provides the pitch and
roll measurements from the
internal inclinometers (in
degrees)

Yes

$RD1 S 1 Hz SBAS diagnostic information Yes

$TSS1 H 20 Hz

Heading, pitch, roll, and heave
message in the commonly
used TSS1 message format

No

¼ Notes:

- The “GP” of the message is the talker ID.

- GPGRS, GPGSA, GPGST, and GPGSV support external integrity checking. They are to be

synchronized with corresponding fix data (GPGGA or GPGNS).

- You can change the message header for the HDG, HDM, HDT, and ROT messages to either

GP or HE using the $JATT,NMEAHE command.

- To preface these messages with GP, issue the following command:

$JATT,NMEAHE,0<CR><LF>

- To preface these messages with HE, issue the following command:

$JATT,NMEAHE,1<CR><LF>

Binary messages

$JBIN Message Description

1 GPS position

2 GPS DOPs

80 SBAS

93 SBAS ephemeris data

94 Ionosphere and UTC conversion parameters

95 Satellite ephemeris data

96 Code and carrier phase

97 Processor statistics

98 Satellites and almanac

99 GPS diagnostics

30 |

Operation | HS80/MX575C User Manual

Parameters specic to $JATT command

Parameter Description Query Specify

COGTAU Set/query COG time constant (0.0 to 3600.0 sec) X X

CSEP Query antenna separation X

EXACT

Enable/disable internal filter reliance on the
entered antenna separation

X X

FLIPBRD

Turn the flip feature on/off. Default is Yes (On). If
performing a factory reset verify this is on.

X X

GYROAID Enable/disable gyro X X

HBIAS Set/query heading bias (-180.0º to 180.0º) X X

HELP

Show the available commands for GPS heading
operation and status

X

HIGHMP

Set/query the high multipath setting for use in
poor

GPS environments X X

HRTAU Set/query ROT time constant (0.0 to 3600.0 sec) X X

HTAU

Set/query heading time constant (0.0 to 3600.0
sec)

X X

LEVEL Enable/disable level operation X X

MSEP Manually set or query antenna separation X X

NEGTILT Enable/disable negative tilt X X

NMEAHE

Change the HDG, HDM, HDT, and ROT message
headers between GP and HE

X X

PBIAS Set/query pitch/roll bias (-15.0º to 15.0º) X X

PTAU Set/query pitch time constant (0.0 to 3600.0 sec) X X

ROLL Configure for roll or pitch GPS orientation X X

SEARCH Force a new GPS heading search X

SPDTAU Set/query speed time constant (0.0 to 3600.0 sec) X X

SUMMARY Display current Crescent Vector settings summary X

TILTAID Enable/disable accelerometer, pre-calibrated X

TILTCAL Calibrate accelerometers X

| 31

Troubleshooting | HS80/MX575C User Manual

Troubleshooting

Table A-1 provides troubleshooting for common problems.

Table A-1: Troubleshooting

Symptom Possible Solution

Receiver fails to power • Verify polarity of power leads

• Check integrity of power cable connectors

• Check power input voltage (6 to 36 VDC)

• Check current restrictions imposed by power source

(minimum available should be > 1.0 A)

No data from HS80/MX575C • Check receiver power status to ensure the receiver is

powered (an ammeter can be used for this)

• Verify desired messages are activated (using the CDU or

$JSHOW command in any terminal program)

• Ensure the baud rate of the HS80/MX575C matches that

of the receiving device

• Check integrity and connectivity of power and data

cable connections

Random data from
HS80/MX575C

• Verify the RTCM or binary messages are not being

output accidentally (send a $JSHOW command)

• Ensure the baud rate of the HS80/MX575C matches that

of the remote device

• Potentially, the volume of data requested to be output

by the HS80/MX575C could be higher than the current
baud rate supports (try using 19200 as the baud rate for
all devices or reduce the amount of data being output)

No GPS lock • Verify the HS80/MX575C has a clear view of the sky

• Verify the lock status of GPS satellites (this can be done

with using the MFD or CDU)

No SBAS lock • Verify the HS80/MX575C has a clear view of the sky

• Verify the lock status of SBAS satellites (this can be done

using the CDU)

• Set SBAS mode to automatic with the

$JWAASPRN,AUTO command

• Note: SBAS lock is only possible if you are in an

appropriate SBAS region; currently, there is limited SBAS
availability in the southern hemisphere.

4

32 |

Troubleshooting | HS80/MX575C User Manual

Symptom Possible Solution

No heading or incorrect
heading value

• Check CSEP value is fairly constant without varying

more than 1 cm (0.39 in)—larger variations may
indicate a high multipath environment and require
moving the receiver location

• Heading is from primary GPS antenna to secondary GPS

antenna, so the arrow on the underside of the HS80/
MX575C should be directed to the bow side

• $JATT,SEARCH command forces the HS80/MX575C to

acquire a new heading solution (unless gyro is enabled)

• Enable GYROAID to provide heading for up to three

minutes during GPS signal loss

• Enable TILTAID to reduce heading search times

• Monitor the number of satellites and SNR values for

both antennas using the CDU—at least four satellites
should have strong SNR values

• Potentially, the volume of data requested to be output

by the HS80/MX575C could be higher than the current
baud rate supports (try using 19200 as the baud rate for
all devices or reduce the amount of data being output)

No DGPS position in external
RTCM mode

• Verify the baud rate of the RTCM input port matches

the baud rate of the external source

• Verify the pinout between the RTCM source and the

RTCM input port (transmit from the source must go to
receive of the RTCM input port and grounds must be
connected)

• Ensure corrections are being transmitted to the correct

port—using the $JDIFF,PORTB command on Port A will
cause the receiver to expect the corrections to be input
through Port B

No Beacon lock (MX575C
only)

• Verify the HS80/MX575C has no obstructions from large

metal objects and railings.

• Verify the Beacon status in the GPS6 screen of the CDU.

Select a known beacon station frequency using manual
mode.

¼ Note: Beacon lock is only possible if you are in areas

where the land-based beacons cover. There are many
areas of the world where beacon signal is not available.

| 33

Technical specications | HS80/MX575C User Manual

Technical specications

Specications

GPS sensor

Item Specification

Receiver type L1, C/A code with carrier phase smoothing

Channels

Two 12-channel, parallel tracking

(Two 10-channel when tracking SBAS)

SBAS tracking 2-channel, parallel tracking

Update rate 1-20 Hz (position and heading)

Horizontal accuracy

< 1.0 m 95% confidence (DGPS1)

< 4.0 m 95% confidence (autonomous, no SA2)

Heading accuracy

< 0.5° RMS

Normal operation: GPS Coasting (no GPS): Gyro

Heave accuracy

< 30 cm RMS

Normal operation: GPS Coasting (no GPS): None

Pitch accuracy

< 1° RMS

Normal operation: GPS

Coasting (no GPS): Inertial sensor

Roll accuracy

< 1° RMS using accelerometer

Normal operation: Inertial sensor

Coasting (no GPS): Inertial sensor

Rate of turn 90°/s maximum

Cold start < 60 s typical (no almanac or RTC)

Warm start < 20 s typical (almanac and RTC)

Hot start < 10 s typical (almanac, RTC, and position)

Heading fix < 10 s typical (valid position)

Compass safe distance 75 cm (29.5 in)4

Maximum speed 1,850 kph (999 kts)

Maximum altitude 18,288 m (60,000 ft)

Timing ( 1PPS) Accuracy 50 ns

Communication spec

Item Specification

Serial ports 1 RS-232 (full-duplex)

2 RS-422 (1 full duplex, 1 half duplex)

Baud rates HS80: 4800, 9600, 19200, 38400, 57600, 115200

MX575C: 4800, 9600, 19200, 38400

Correction I/O protocol RTCM SC-104

Data I/O protocol NMEA 0183, NMEA 2000

I

5

34 |

Technical specications | HS80/MX575C User Manual

Power

Item Specification

Input voltage 6 to 36 VDC

Power consumption 3 W nominal

Current consumption HS80 MX575C

320 mA @ 9 VDC 350 mA @ 9 VDC

240 mA @ 12 VDC 265 mA @ 12 VDC

180 mA @ 16 VDC 200 mA @ 16 VDC

Power isolation Isolated to enclosure

Reverse polarity protection Yes

Mechanical spec

Item Specification

Enclosure UV resistant, white plastic, AES HW 600G, non-corrosive,

self-extinguishing

Dimensions 209.16 W x 668.54 L x 122.32 H (mm)

8.234 W x 26.320 L x 4.815 H (in)

Weight HS80 MX575C

2.131 kg (4.70 lb) 2.44 kg (5.38 lb)

Environmental spec

Item Specification

Operating temperature -30°C to +70°C (-22°F to +158°F)

Storage temperature -40°C to +85°C (-40°F to +185°F)

Humidity 95% non-condensing

Vibration IEC 60945

EMC FCC Part 15, Subpart B; CISPR22; IEC 60945 (CE)

| 35

Technical specications | HS80/MX575C User Manual

Certications

Heading Device

IMO Resolution MSC.116(73) ISO 22090-3 Ed.1.0, 2004 incl. Corr. 1,2005

IMO Resolution A.694(17) IEC 60945 Ed.4.0, 2002 incl. Corr.1, 2008

IMO Resolution MSC.191(79) IEC 61162-1 Ed.4.0 2010

IEC 61162-2 Ed.1.0, 1998

IEC 62288 Ed.1.0, 2008

IMO Wheelmarked for Annex A.1 item 4.41 Transmitting heading device THD (GNSS method.
Based on the Directive 2009/26/EC.

Navigation Equipment

IMO Resolution MSC.112(73) IEC 61108-1 Ed.2.0 2003

IMO Resolution MSC.114(73) IEC 61108-4 Ed.1.0 2004

IMO Resolution A.694(17) IEC 60945 Ed.4.0, 2002 incl. Corr.1, 2008

IMO Resolution MSC.191(79) IEC 61162-1 Ed.4.0, 2010

IEC 62288 Ed.1.0, 2008

1

Depends on multipath environment, number of satellites in view, satellite geometry,

ionospheric activity, and use of SBAS

2

Depends on multipath environment, number of satellites in view, satellite geometry, and

ionospheric activity

* SIMRAD GPS proprietary

4

IEC 60945 Standard

5

Based on a 40 second time constant

36 |

Technical specications | HS80/MX575C User Manual

Output messages

The MX575C data output conforms to the NMEA 0183 V4.0 at 4800, 9600, or 19200 baud.
Below is a list of the NMEA sentences output:

NMEA 0183 data output sentences

(1) GBS - GNSS Satellite Fault Detection (Modied MX Marine 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<CR><LF>

1 2 3 4 5 6 7 8 9

¼ Notes:

1 UTC time of the GGA or GNS fix associated with this sentence.

2 Expected error in Latitude (meters)

3 Expected error in Longitude (meters)

4 Expected error in Altitude (meters)

5 ID number of most likely failed satellite

6 Probability of missed detection for most likely failed satellite

7 Estimate of bias in meters on most likely failed satellite

8 Standard deviation of bias estimate

9 RAIM status mode; 0=safe, 1=caution, 2=unsafe

(2) 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.x,xxxx*hh<CR><LF>

1 2 3 4 5 6 7 8 9 10 11 12 13 14

¼ Notes:

1 UTC of position

2, 3 Latitude, N/S

4, 5 Longitude, E/W

6 GPS Quality Indicator

0 = Fix not available or invalid

1 = GPS SPS Mode, fix valid

2 = Differential GPS, SPS Mode, fix valid

3 = GPS PPS Mode, fix valid

7 Number of Satellites in use, 00-12, may be different from the number in view

8 Horizontal Dilution of Precision (HDOP)

9 Antenna altitude/mean-sea-level (geoid)

10 Units of antenna altitude, Meters

11, 12 Geoidal Height, Meters

13 Age of Differential GPS Data

14 Differential Reference Station ID

| 37

Technical specications | HS80/MX575C User Manual

(3) GLL – Geographic Position - Latitude/Longitude

Latitude and Longitude of vessel position, time of position fix and status.

$--GLL,llll.ll,a,yyyyy.yy,a,hhmmss.ss,A,a*hh<CR><LF>

1 2 3 4 5 6 7

¼ Notes:

1, 2 Latitude, N/S

3, 4 Longitude, E/W

5 UTC of position

6 Status

V - Invalid

A - Autonomous Mode

D - Differential Mode

7 Mode indicator

(4) GSA – GPS DOP and Active Satellites

GPS receiver operating mode, satellites used in the navigation solution reported by the
$GPGGA sentence, and DOP values.

$GPGSA,a,x,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,xx,x.x,x.x,x.x,x*hh<CR><LF>

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18

¼ Notes:

1 Mode:

M = Manual, forced to operate in 2D or 3D Mode

A = Automatic, allowed to automatically switch 2D/3D

2 Mode:

1 = Fix not available

2 = 2D

3 = 3D

3-14 PRN numbers of satellites used in solution (null

for unused fields)

15 PDOP

16 HDOP

17 VDOP

18 Signal type 1 for L1/CA

38 |

Technical specications | HS80/MX575C User Manual

(5) GST - GNSS Pseudorange Error Statistics

This message is used to support Receiver Autonomous Integrity Monitoring (RAIM).
Pseudorange measurement error statistics can be translated in the position domain in order
to give statistical measures of the quality of the position solution.

If only GPS, GLONASS, etc. is used for the reported position solution, the talker ID is GP, GL,
etc., and the error data pertains to the individual system. If satellites from multiple systems
are used to obtain the reported position solution, the talker ID is GN and the errors pertain to
the combined solution.

$GPGST,hhmmss.ss,x.x,x.x,x.x,x.x,x.x,x.x,x.x*hh<CR><LF>

1 2 3 4 5 6 7 8

¼ Notes:

1 UTC time of the GGA or GNS fix associated with this sentence

2 RMS value of the standard deviation of the range inputs to the navigation

process. Range inputs include preudoranges & DGNSS corrections

3 Standard deviation of semi-major axis of error ellipse (meters)

4 Standard deviation of semi-minor axis of error ellipse (meters)

5 Orientation of semi-major axis of error ellipse (degrees from true north)

6 Standard deviation of latitude error (meters)

7 Standard deviation of longitude error (meters)

8 Standard deviation of altitude error (meters)

(6) 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,....................,xx,xx,xxx,xx,x*hh<CR><LF>

1 2 3 4 5 6 7 8 9 10 11 1213

¼ Notes:

1 Total number of messages, 1 to 3

2 Message number, 1 to 3

3 Total number of satellites in view

4 Satellite PRN number

5 Elevation, degrees, 90 degrees maximum

6 Azimuth, degrees True, 000 to 359

7 SNR (C/No) 00-99 dB, null when not tracking

8 2nd and 3rd SV

9, 10, 11, 12 4th SV

13 Signal type 1 for L1/CA

| 39

Technical specications | HS80/MX575C User Manual

(7) HDT – Heading, True

Actual vessel heading in degrees (True) produced by any device or system producing true
heading.

$GPHDT,x.x,T*hh<CR><LF>

1 2

¼ Notes:

1 Heading

2 Degrees True

(8) RMC - Recommended Minimum Specic GPS Data

Time, date, position, course and speed data provided by a GPS navigation receiver. This
sentence is transmitted at intervals not exceeding 2 seconds. All data fields must be
provided: null fields used only when data is temporarily unavailable.

$GPRMC,hhmmss.ss,A,llll.llll,a,yyyyy.yyyy,a,x.x,x.x,xxxxxx,x.x,a,a,a*hh<CR><LF>

1 2 3 4 5 6 7 8 9 10 11-12-13

¼ Notes:

1 UTC of Position fix

2 Status

A = data valid

V = Navigation receiver warning

3, 4 Latitude, N/S

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) add to True course

12 Mode indicator:

A = Autonomous mode

D = Differential mode

E = Estimated (DR)

M = Manual input mode

S = Simulator mode

N = Data not valid

13 RAIM Status:

S=RAIM Safe

U=RAIM Unsafe

C= Caution

V=Not Valid

40 |

Technical specications | HS80/MX575C User Manual

(9) ROT – Rate Of Turn

Rate of turn and direction of turn.

$GPROT,x.x,A*hh<CR><LF>

1 2

¼ Notes:

1 Rate of turn, degrees/minute, “-“ = bow turns to port

2 Status: (A = Data valid, V = Data invalid)

(10) RRE - Range Residuals and Estimated Position E

The RRE message contains the satellite range residuals and estimated position error.

$GPRRE,n,ii,rr…ii,rr,hhh.h,vvv.v *hh<CR><LF>

1 2 3 4 5

¼ Notes:

1 Number of satellites used in position computation

2, 3 Satellite number, Range residual in meters

4 Horizontal position error estimate in meters

5 Vertical position error estimate in meters

(11) 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.x,K,a*hh<CR><LF>

1 2 3 4 5 6 7 8 9

¼ Notes:

1, 2 Course over ground, degrees True

3, 4 Course over ground, degrees Magnetic

5, 6 Speed over ground, knots

7, 8 Speed over ground, km/hr

9 Mode indicator:

A = Autonomous mode

D = Differential mode

E = Estimated (DR)

M = Manual input mode

S = Simulator mode

N = Data not valid

| 41

Technical specications | HS80/MX575C User Manual

(12) ZDA - Time and Date

UTC, day, month, year and local time zone

$GPZDA,hhmmss,xx,xx,xxxx,xx,xx*hh<CR><LF>

1 2 3 4 5 6

¼ Notes:

1 UTC

2, 3, 4 Day, month & year

5 Local zone hours, 00 to + 13 hrs

6 Local zone in minutes, 00 to +59.

(13) PCSI - Beacon Status Message

This message contains a variety of information relating to the status of Beacon engine inside
the MX575. The $PCSI,1 output message from the SBX beacon module is intelligently routed
through the MX575 to the port from which the $PCSI,1 message was requested.

$PCSI,CS0,PXXX-Y.YYY,SN,fff.f,M,ddd,R,SS,SNR,MTP,Q,ID,H,T

1 2 3 4 5 6 7 8 9 10 11 12 1314

¼ Notes:

1 Channel 0

2 Resident SBX-3 firmware version

3 SBX-3 receiver serial number

4 Channel 0 current frequency

5 Frequency Mode (‘A’ - Auto or ‘M’ - Manual)

6 MSK bit rate

7 RTCM rate

8 Signal strength

9 Signal to noise ratio

10 Message throughput

11 Quality number {0-25} - number of successive good 30 bit RTCM words

received

12 Beacon ID to which the receiver’s primary channel is tuned

13 Health of the tuned beacon [0-7]

14 $PCSI,1 status output period {0-99}

42 |

Technical specications | HS80/MX575C User Manual

Proprietary Input data messages

The table below gives a list of the available proprietary input messages and their description:

Message type Description

$PMVXG,303 RESET CONTROL

$PMVXG,026 NMEA MESSAGE SCHEDULE

$PMVXG,200 SET PORT CONFIGURATION

$PCSI BEACON PCB CONTROL

$GPMSK,305 BEACON AUTO/MANUAL CONTROL

$JSAVE SAVES ALL CHANGED PARAMETERS

$JDIFF CONTROLS THE DIFFERENTIAL BEACON RECEIVER

$JSHOW SHOWS ALL GPS AND BEACON PARAMETERS

Sentence type - $PMVXG,303

Description: Reset Control

This message allows the user to command various types of resets to the MX575.

Flow: Input

$PMVXG,303 – Reset Control

Field Description Units Format Range

1 Reset Control Int

0. No Action

1. Reset Serial I/O to Factory Default

Settings.

2. Resets GPS Parameters to Factory

Default settings, User I/O Settings
Remain

3. Resets GPS Parameters to Factory

Default Settings, I/O Settings Return to
Factory Defaults.

4. Reset All Parameters Except the

Oscillator Model

2 NULL

Example:

$PMVXG,303,3*57

$PMVXG,303,4*50

| 43

Technical specications | HS80/MX575C User Manual

Sentence type - $PMVXG,026

Description: NMEA Message Schedule

This message enables/disables output of the specified sentence to the NMEA port and
defines the output rate.

Flow: Input

$PMVXG,026 – NMEA Schedule

Field Description Units Format Range

1

Equipment Port
Output Block

Example “GGA”

Char Default = None

2 Clear Current List Int

0 = NO

1 = YES

Default = None

3

Add/Delete Sentence
From List

Int

1 = Append Sentence to Output List

2 = Delete Sentence From Output List

Default = None

4

Sentence Output
Rate

Sec Float

>0 = Output Period

-1 = When new Data is Available

5

Position Precision
(number of decimal
units in position
output)

Int

2-6

Default = 2

6 Null

Example:

$PMVXG,026,HDT,0,1,1,,,*

$PMVXG,026,ROT,0,1,1,,,*

$PMVXG,026,VTG,0,1,5,5,*

44 |

Technical specications | HS80/MX575C User Manual

Sentence type: $PMVXG,200

Description: Set Port Configuration

This message sets the transmission rate, number of data bits, and parity convention for each
of the serial interface ports.

Flow: Input

$PMVXG,200 – PORT CONFIGURATION

Field Description Units Format Range

1 Serial Port Int

0 = Current Port

1 = Port 1

2 = Port 2

Default:

2 Baud Rate Int

5 = 4800

6 = 9600

7 = 19200

Default:

3 Stop Bits Int

1 = 1 Stop Bit

2 = 2 Stop Bits

Default:

4 Pacing Mode Int

0 = None

1 = XON/XOFF

2 = CTS/RTS

Default:

5 Parity Int

0 = No Parity

1 = Even Parity

2 = Odd Parity

Default:

6

Serial Port Output
Format

Int

0 = None

1 = MX LB2

2 = Auxiliary LB2

4 = RTCM Output

10 = Primary NMEA

11 = Auxiliary NMEA

Default:

7

Serial Port Input
Format

Int

1 = MX LB2

2 = Aux. LB2

4 = RTCM Input

10 = NMEA Input

11 = Aux NMEA

Default:

Example:

$PMVXG,200,1,6,,,,10,10*61

$PMVXG,200,1,7,,,,,*60

| 45

Technical specications | HS80/MX575C User Manual

Sentence type: $GPMSK

Description: Beacon tune command

There are three main derivatives of this command that affects the method of beacon receiver
tuning, and each are described in the following sections.

Full manual command ($GPMSK):

This command instructs the MX575’s internal beacon receiver to tune to a specified frequency
and MSK Rate.

It has the following form:

$GPMSK,fff.f,M,ddd,M,n<CR><LF>

The internal SBX will reply with the following response:

$PCSI,ACK,GPMSK,fff.f,M,ddd,M,n<CR><LF>

When this message is acknowledged by the internal beacon receiver, it will immediately tune
to the frequency specified and demodulate at the rate specified.

Field Description

fff.f Frequency in kHz (283.5 to 325)

M Designates manual frequency selection

ddd MSK bit rate (100 or 200 bps)

M Designates manual MSK bit rate selection

n

Period of output of performance status message, 0 to 100 seconds
($CRMSS)

Example:

$GPMSK,305,M,,A,,,*

$GPMSK,305,,A,,A,,,*

Partial manual tune command ($GPMSK):

This command instructs the internal beacon receiver to tune to a specified frequency and
automatically select the correct MSK rate.

It has the following form:

$GPMSK,fff.f,M,,A,n<CR><LF

The internal SBX will reply with the following response:

$PCSI,ACK,GPMSK,fff.f,M,,A,n<CR><LF>

When this message is acknowledged by the internal beacon receiver, it will immediately tune
to the frequency specified and demodulate at the rate specified.

Field Description

fff.f Frequency in kHz (283.5 to 325)

M Designates manual frequency selection

ddd MSK bit rate (100 or 200 bps)

A Designates Automatic MSK bit rate selection

n

Period of output of performance status message, 0 to 100 seconds
($CRMSS)

46 |

Technical specications | HS80/MX575C User Manual

Automatic beacon search command ($GPMSK,305):

This command initiates the beacon receiver to automatic mode of operation in which the
receiver operates without operator intervention, selecting the most appropriate beacon
station.

This command has the following format:

$GPMSK,305,A,,A,,,<CR><LF>

The internal beacon receiver will reply with the following response:

$PCSI,ACK,GPMSK,,A,,A,n<CR><LF>

Field Description

A1 Automatic Frequency selection Mode

A2 Designates Automatic rate selection

null

The MX575 provides the above response to this variety of $GPMSK message, and immediately
tunes to the optimum beacon station in automatic mode, provided a valid beacon almanac
is present in receiver memory. Without a valid almanac, the beacon receiver will perform a
Global Search to identify candidate stations in the area, followed by the acquisition phase of
the initial search.

Beacon database search mode ($GPMSK,305):

This operating mode has been added to the MX575C beacon receiver in order to be
compliant with the specification IEC 61108-4 for ship borne DGPS maritime radio beacon
receiver equipment.

The basic operation is outlined below.

1. The receiver will determine the 10 closest beacon stations after the GPS receiver has

calculated a valid position fix. The list can be accessed using the command $PCSI,3,2*.

2. The primary beacon channel tries to tune to the closest available station, using the frequency

and bit rate specified in the station database.

3. The background channel tunes to the frequency of the closest station using an alternate bit

rate.

4. The primary channel retunes to the alternate bit rate if lock is achieved on the background

channel (with acceptable station health and WER).

5. The background channel continually searches for a closer station using the station database

once a lock is achieved on the primary channel.

6. The primary channel will remain tuned to the same station unless one of the following

occurs:

- Word error rate (WER) drops below 10%

- Station becomes unhealthy or unmonitored

- Background channel finds a closer station

- Position changes enough to affect station list.

This command has the following format:

$GPMSK,305,D,,D<CR><LF>

| 47

Technical specications | HS80/MX575C User Manual

Sentence type: $JSHOW

Description: Command to show its current configuration.

This command is used to poll the MX575 receiver for its current configuration.

This command has the following structure.

$JSHOW[,subset] <CR><LF>

Using the $JSHOW command without the optional ‘,subset’ field will provide a complete
response from the receiver. An example of this response follows.

$>JSHOW,BAUD,9600 (1)

$>JSHOW,BAUD,9600,OTHER (2)

$>JSHOW,ASC,GPGGA,1.0,OTHER (3)

$>JSHOW,ASC,GPVTG,1.0,OTHER (4)

$>JSHOW,ASC,GPGSV,1.0,OTHER (5)

$>JSHOW,ASC,GPGST,1.0,OTHER (6)

$>JSHOW,ASC,D1,1,OTHER (7)

$>JSHOW,DIFF,WAAS (8)

$>JSHOW,ALT,NEVER (9)

$>JSHOW,LIMIT,10.0 (10)

$>JSHOW,MASK,5 (11)

$>JSHOW,POS,51.0,-114.0 (12)

$>JSHOW,AIR,AUTO,OFF (13)

$>JSHOW,FREQ,1575.4200,250 (14)

$>JSHOW,AGE,1800 (15)

This example response is summarized in the following table.

Line Description

1 This line indicates that the current port is set to a baud rate of 9600

2 This line indicates that the other port is set to a baud rate of 9600

3

This line indicates that GPGGA is output at a rate of 1 Hz from the other
port

4

This line indicates that GPVTG is output at a rate of 1 Hz from the other
port

5

This line indicates that the GPGSV is output at a rate of 1 Hz from the
other port

6

This line indicates that GPGST is output at a rate of 1 Hz from the other
port

7 This line indicates that D1 is output at a rate of 1 Hz from the other port

8 This line indicates that the current differential mode is WAAS

9 This line indicates the status of the altitude aiding feature

10

This line indicates the threshold of estimated differential performance
that allows the green DGPS LED to illuminate (on the Mini MAX only)

11 This line indicates the current elevation mask cutoff angle, in degrees

12

This line indicates the current seed position used for startup, in decimal
degrees

13 This line indicates the current status of the AIR mode

48 |

Technical specications | HS80/MX575C User Manual

Line Description

14 This line indicates the current frequency of the L-band receiver

15

This line indicates the current maximum acceptable differential age in
seconds

When issuing this command with the optional, ‘subset’ data field (without the square
brackets), a one-line response is provided. The subset field maybe either CONF or GP.

When CONF is specified for ‘subset’, the following response is provided.

$>JSHOW,CONF,N,0.0,10.0,5,A,60W

This response is summarized in the following table.

Message

Component

Description

$>JSHOW,CONF Message header

N N ‘N’ indicates no altitude aiding

0.0

‘0.0’ indicates the aiding value, if specified (either specified height or
PDOP threshold)

10.0 Residual limit for the $JLIMIT command

5 Elevation mask cutoff angle, in degrees

A AIR mode indication

60 Maximum acceptable age of correction data in seconds

W Current differential mode, ‘W’ indicates WAAS mode

When GP is specified for ‘subset’, the following is an example response provided:

$>JSHOW,GP,GGA,1.0

This response will provide the >$JSHOW,GP message header, followed by each message
currently being output through the current port and also the update rate for that message.

| 49

Technical specications | HS80/MX575C User Manual

Sentence type: $JDIFF

Description: Beacon receiver differential mode

This command is used to change the differential mode of the receiver. The default differential
mode is Auto/Database.

This command has the following structure.

$JDIFF,diff<CR><LF>

Where the differential mode variable, ‘diff’, has one of the following values:

$JDIFF,diff<CR><LF>

Values Description

OTHER

Specifying OTHER instructs the receiver to use external corrections input
through the opposite port from which you are communicating

BEACON

Specifying BEACON instructs the receiver to use corrections from the
internal SBX beacon engine

WAAS Specifying WAAS instructs the receiver to use SBAS corrections

LBAND Specifying LBAND instructs the receiver to use OmniSTAR corrections.

AUTODIFF Specifying AUTODIFF instructs the receiver to use eDif mode

NONE

In order for the receiver to operate in autonomous mode, the NONE
argument may be specified in this command.

Example:

$JDIFF,BEACON*

$JDIFF,LBAND*

$JDIFF,WAAS*

50 |

Wiring Diagrams | HS80/MX575C User Manual

Wiring Diagrams

MX420 CDU to MX575C interface diagram

RL1

RL2

RS232 enable

J1

UPPER LOWER

Rs232
PORT 2

Tx

Rx

GND

MX420/2 JUNCTION BOX

CABLE A

MX ANTENNA
PORT

PORT1
DUAL CONTROL

EXT. AL ARM
POWER FAIL

PWR INPUT

IN +

GND

U1

U2

U7

U4

U9

U5

U6

2 AMP

B IN
A IN

B OUT
A OUT

BRN
ORG
GRN
BLK
RED

GREY
PURPLE
YEL
WHT
BLU

B IN
A IN

B OUT
A OUT

NO
NC
C

NO
NC

C

IN -

12-32 VDC
POWER INPUT

1

18

MX420/2

HS80/MX575C

BLK (GND)

RED (12 VDC)

YEL

YEL/BLK

BLK/B RN

BRN

GRN
GRN/BLK

ORG*

ORG/BLK *

1PPS+

1 PPS-

MX510/MX512 to MX575C interface diagram

RED (+12 VDC)

BLK (NEG)

BLK

GRN (NMEA3 RX+)

ORG (NMEA3 RX-)

BRN (NMEA3 TX+)

BLU (NMEA3 TX -)

YEL/BL K

YEL

BLK/BRN

BRN

MX510/MX512 CDU

HS80/MX575C

10-PIN CABLE ASSY.

P/N 3508 102 70150

(3-METERS)

WHT (BEACON IN +)

YEL (BEACON IN -)

GRN/BLK

GRN

*ORG (1 PPS+)

*ORG/BL K (1 PPS-)

6

| 51

Wiring Diagrams | HS80/MX575C User Manual

HS80/MX575C interface via MX510 junction Box

IN+

IN-

A in

B in B out

A out

RED

BLK

GRN

ORG

BRN

BLU

WHT

YEL

PUR

GRY

A in A out

B in B out

A in A out

B in B out

MOB GND
NO C

GFC GND

A out A out

A out A out

A out A out

B out B out

B out B out

B out B out

Upper Lower

S

p

l

it

t

e

r

O

u

t

p

u

t

s

E

x

t

.

A

l

a

r

m

s

S

p

d

L

o

g

F1

MOB GND

C NO

B out B i n

A out A i n

BLU RED
WHT BLK

YEL GRN
PPL ORG
GRY BRN

GND GFC

B out B i n

A out A i n
B out B i n

A out A i n

IN- IN+

Lower Upper

P

o

r

t

2

A

P

o

r

t

1

A

M

X

S

m

a

r

t

A

n

t

e

n

n

a

PWR

J-BOX for MX500/MX510

P/N 500 100 1002

+

-

12-32 VDC

RED

BLK

YEL/BLK

BLK/BRN

BRN

YEL

HS80/MX575C

BLK

RED

Mx510

A

N

T

.

C

a

b

l

e

(

P

/

N

3

5

0

8

1

0

2

7

0

1

5

0

)

A

U

X

C

a

b

l

e

(

P

/

N

5

0

0

1

0

0

1

0

0

1

)

P

R

T

2

C

P

R

T

2

B

P

R

T

1

D

P

R

T

1

B

P

R

T

1

C

P

R

T

2

D

GRN

GRN/BLK

52 |

Wiring Diagrams | HS80/MX575C User Manual

MX512 to MX575C interface diagram via MX512 Junction
Box

MOB

PWR FAIL

N.C.

PWR FAIL

C

PWR FAIL

MOB

P

O

R

T

1

M

X

4

2

1

SPEE

D

LOG

E

X

T

.

A

L

A

R

M

G

P

I

O

1

G

P

I

O

2

G

P

I

O

3

P

0

R

T

4

P

O

R

T

5

P

O

R

T

6

P

O

R

T

7

P

O

R

T

8

P

O

R

T

9

P

R

T

1

0

P

R

T

1

1

1

2

V

GND NMEA1

RX

GND

A In A Out

B In

B Out

GND

A Out

GND NMEA5

B Out

A In

A Out

B In B Out

A In

A Out

B In

B Out

A In

A Out

B In

B Out

A In

A Out

B In

B Out

A In A Out

B In

B Out

A In

A Out

B In

B Out

GND

RS-232 GND

RS-232 TX

RS-232 RX

A In

A Out

B In

B Out

A In

A Out

B In B Out

A In

A Out

B In B Out

A In

A Out

B In

B Out

RED

BLK

GRN

ORG

BRN

BLU

WHT

YEL

PURPLE

GRY

+12 VDC

GND (-)

DRY RELAY

3

DRY RELAY

4

DRY RELAY

1

DRY RELAY

2

UPPER LOWER

ECDIS

PILOT

PORT

DGPS

CH1

_IN+

CH1

_IN-

CH1

_GND

CH

2_GN

D

CH2

_IN+

CH

2_IN-

CH3

_IN+

CH3_

IN-

CH3

_GND

CH4_

GND

C

H

4

_

I

N

+

C

H4_I

N-

CH

4_OU

T+

CH

4_OU

T-

CH5_

IN+

CH5

_IN-

CH5

_OU

T+

CH5

_OU

T-

CH5

_GN

D

CH8

_GN

D

CH

8_IN+

C

H8_O

UT+

CH8

_IN-

CH

8_OU

T-

C

H

9

_

I

N

+

C

H9_O

UT+

CH

9_IN

-

C

H9_O

UT-

C

H9_G

ND

S

PR_

GND

SPR_

IN+

SPR

_OU

T+

S

PR_I

N-

SPR_

OUT

-

CH6

_CAN

H

CH

6_VIN

CH6_

CAN

L

CH6

_GN

D

CH10_1 CH1

0_2

J5

J4

B In

B Out

A In

A Out

PORT 2

UPPE

R

L

O

W

E

R

PORT 11 TX/RX (RS-232)

Printer Output

EXT. MOB

SWITCH

5

2

3

9-dB Serial

Connector

RED

BLK

YEL

BLK/BRN

YEL/BLK

HS80/MX575C

GRN

BLK/GRN

EXT. ALARM

N.O. CONTACTS

PORT 1 TX/RX (RS-422)

PORT 2 TX/RX (RS-422)

PORT 5 TX/RX (RS-422)

PORT 6 TX/RX (RS-422)

PORT 7 TX/RX (RS-422

PORT 8 TX/RX (RS-422)

PORT 9 TX/RX (RS-422)

PORT10 TX/RX )RS-422)

PORT 4 TX only (RS-422)

PULSE SPEED I/O

N/U

GENERAL POWER

ALARM

J3

J7

J6

J1

J2

MX512 CDU

1

2

3

4

Notes:

1. Cables 1,2&4arepre-installed in

the junction box.

Where:

1 - AUX Cable (500 100 1001)

2 - ANT Cable (3508 102 70150)

4 - 44-Pin Cable (512 100 2001)

+12-32 VDC POWER

GND

UPPERLOWER

UPPERLOWER

AUX Cable

(8-Pin)

Antenna Cable

(10-Pin)

PWR/DATA Cable

(12-Pin)

YELLOW N/C

BLUE

PURPLE

ORANGE

GREY

BROWN

WHITE

BLUE

RED

WHITE BLACK

YELLOW GREEN

PURPLE

ORANGE

GREY

BROWN

AUX-GRN

PWR-

LT. GRN

WHITE

GREY

YELLOW

PURPLE

BROWN

GREEN

BLUE

ORANGE

BLACK

RED

2. Cable # 3 (PWR/DATA) to be

wired by installer.

BRN

| 53

Wiring Diagrams | HS80/MX575C User Manual

1PPS output of MX575C

BLK (-)

YEL/BL K (Port B TX -)

YEL (Port B TX+)

BLK/ BRN (Port B RX-)

BRN (Port B RX+

HS80/MX575C

BLK/GRN (Port A TX-)

GRN (Port A TX+)

ORG (1 PPS+)

*ORG/BLK (1 PPS-)

+12-24 VDC

GND

To 1 PPS
Load

PC to MX575C interface diagram

BLK (-)

YEL/BLK (Port B TX-)

YEL (P ort B T X+)

BLK/B RN (Port B RX-)

BRN (P ort B RX +

HS 80/M X575C

BLK/G RN (Por t A TX-)

GR Y (G ND)

+12-24 VDC

GND

2

3

5

dB-9
Connector

*988-10221-001*