SRT Marine Systems plc 4180003 Carbon AIS Aid to Navigation Transceiver User Manual Carbon manual

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User manual - section 2

Configuration using proAtoN

Page 35

Channel 2 start UTC

This is the hour and minute for transmission on channel 2. This specifies the AIS frame (minute) within a day

in which the start slot for channel 2 resides. Typically the channel 2 start time is offset by 3 minutes from the

start time used for channel 1. With a 6 minute reporting interval on each channel this results in a transmission

every 3 minutes on alternating channels.

Channel 2 start slot

This is the slot number for the first transmission on channel 2. The slot number can range from -1 (transmission

disabled on this channel) to 2249. Note that each message #21 transmission occupies two slots and associated

base station slot reservations must therefore reserve two slots.

Channel 2 interval

This is the interval in slots between transmissions on channel 2. The interval can range from 0 to 3240000 slots,

which equates to an interval of one day. Typically the interval is set to 13500 slots (6 minutes) on each channel

which results in an overall interval of 3 minutes.

Example FATDMA schedule

A typical transmission schedule requires that the AIS AtoN transceiver transmit AIS message #21 every three

minutes on alternating channels. The transmission schedule is presented diagrammatically in Figure 19.

Figure 19 Example FATDMA schedule

This schedule can be configured using the following values:

●Channel 1 start UTC = 00:00 (the first frame of every hour)

●Channel 1 start slot = 0 (the first slot in the frame, so slots 0 and 1 are used by the message #21

transmission)

●Channel 1 interval = 13500 slots (this equates to a 6 minute interval as there are 2250 slots per

minute)

●Channel 2 start UTC = 00:03 (the third frame of every hour)

●Channel 2 start slot = 0 (the first slot in the frame, so slots 0 and 1 are used by the message #21

transmission)

●Channel 2 interval = 13500 slots (this equates to a 6 minute interval as there are 2250 slots per

minute)

Channel 1

00:01

00:02

00:03

00:04

00:05

00:06

00:07

00:08

00:09

00:10

00:11

00:12

00:00

hh:mm

Channel 1 interval

13500 slots (6 minutes)

Channel 2

00:01

00:02

00:03

00:04

00:05

00:06

00:07

00:08

00:09

00:10

00:11

00:12

00:00

hh:mm

Channel 2 interval

13500 slots (6 minutes)

Overall interval

7500 slots

(3 minutes)

Configuration using proAtoN

Page 36

The transceiver is now configured to report message #21 on channel 1 every 6th minute, and on channel 2

every 6th minute, but offset by three minutes from channel 1. This results in a transmission of message #21

every three minutes on alternating channels. The actual start slot selected for each channel will depend on the

FATDMA allocations in the area of operation.

7.3.4 RATDMA Schedule configuration

Using the RATDMA (Random Access TDMA) access scheme the time for each transmission made by the

transceiver is specified. The transceiver will determine the actual slots used for transmission based on internal

knowledge of the AIS environment gained from the AIS receivers.

The parameters required for an RATDMA schedule are as follows.

Channel 1 start UTC

This is the hour and minute of the frame in which transmission will occur on channel 1. The slot used within this

frame will be determined by the transceiver.

Channel 1 interval

This is the interval in minutes between transmissions on channel 1. A typical value is 6 minutes.

Channel 2 start UTC

This is the hour and minute of the frame in which transmission will occur on channel 2. The slot used within this

frame will be determined by the transceiver.

Channel 2 interval

This is the interval in minutes between transmissions on channel 1. A typical value is 6 minutes.

Example RATDMA schedule

A typical transmission schedule requires that the AIS AtoN transceiver transmit AIS message #21 every three

minutes on alternating channels. The transmission schedule is presented diagrammatically in Figure 20.

Figure 20 Example RATDMA schedule

This schedule can be configured using the following values:

●Channel 1 start UTC = 00:00 (the first minute of every hour)

●Channel 1 interval = 6 minutes

●Channel 2 start UTC = 00:03 (the third minute of every hour)

●Channel 2 interval = 6 minutes

T3+S

Channel 1

00:01

00:02

00:03

00:04

00:05

00:06

00:07

00:08

00:09

00:10

00:11

00:12

00:00

hh:mm

Channel 1 interval

6 minutes

Channel 2

00:01

00:02

00:03

00:04

00:05

00:06

00:07

00:08

00:09

00:10

00:11

00:12

00:00

hh:mm

Channel 2 interval

6 minutes

Overall interval

(3 minutes)

Configuration using proAtoN

Page 37

The transceiver is now configured to report message #21 on channel 1 every 6th minute, and on channel 2

every 6th minute, but offset by three minutes from channel 1. This results in a transmission of message #21

every three minutes on alternating channels. The exact timings of the transmissions within the selected minute

will vary as the transceiver selects available slots using RATDMA.

7.3.5 Virtual AtoN configuration

The transceiver can be configured to transmit position reports for up to five virtual or synthetic Aids to

Navigation. This configuration is carried out using the Virtual AtoN(s) tab in proAtoN. Within this tab there are

sub-tabs relating to each of the five virtual or synthetic AtoNs. The sub-tabs are visible at the left hand edge of

the window. The layout of the virtual AtoN configuration tab is provided in Figure 21.

Figure 21 Virtual AtoN configuration tab layout

The following parameters are required to configure a virtual or synthetic AtoN. Note that the ‘real’ AtoN must

be properly configured in order to make use of the virtual AtoN feature.

Virtual / Synthetic AtoN

Each virtual AtoN required must be separately enabled by checking the ‘Enable’ checkbox. The type of virtual

AtoN can then be selected.

●Virtual AtoN

A virtual AtoN is transmission of message #21 for an Aid to Navigation that does not physically exist.

A virtual AtoN may be used to mark a temporary hazard to navigation, e.g., a wreck. For further

information on the use of virtual AtoNs please refer to IALA A-126, IALA O-143 and IALA guideline

1081.

●Synthetic AtoN

A synthetic AtoN is transmission of message #21 from an AIS station located remotely from the

physical Aid to Navigation. An example of use is to provide an AIS AtoN target for a buoy or mark that

is not capable of supporting AIS AtoN hardware.

Virtual AtoN Details

The basic configuration of a virtual or synthetic AtoN is comparable to that required for a ‘real’ AIS AtoN. Note

that the MMSI number format is different:

●A virtual AtoN MMSI has the format 99MID6XXX, where MID is the appropriate national MID and XXX

is a number unique to this station.

Enable virtual AtoN

and select type

Virtual AtoN subtabs

Virtual AtoN details

Virtual AtoN schedule

Configuration using proAtoN

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●A synthetic AtoN MMSI has the same format as a real AtoN MMSI, e.g., 99MID1XXX, where MID is

the appropriate national MID and XXX is a number unique to this station.

The position of the virtual or synthetic AtoN must be configured appropriately to the position of the aid. The

dimensions of the virtual or synthetic AtoN should also be configured.

Virtual AtoN schedule

The transmission schedule for a virtual or synthetic AtoN must be configured in the same way as that for the

‘real’ AtoN. The TDMA access scheme, start times and intervals must be configured in the virtual AtoN tab

following the guidance in section 7.3.3 or 7.3.4 as appropriate. When an FATDMA schedule is used it is

important to ensure the slot allocations used for the virtual and real AtoNs are different in every case. Also note

that two consecutive slots are used for each virtual AtoN report.

7.3.6 Alert messages

The transceiver can be configured to transmit text messages for three different alert conditions.

●An addressed or broadcast text message can be transmitted when the transceiver detects a Built In

Integrity Test (BIIT) failure.

●An addressed text message can be transmitted to an approaching vessel if the vessel comes within a

configurable distance of the transceivers location. This function is only available with Type 3 variants

and with full time receiver operation.

●An addressed or broadcast text message can be transmitted when the transceiver determines that it

is off position (see section 7.3.1). This message is in addition to use of the alternate schedule for off

position reporting (if the alternate schedule is enabled) and does not replace that function.

The layout of the alert messages configuration tab is provided in Figure 22.

Figure 22 Alert messages configuration tab layout

BIIT failure actions

This section allows configuration of the text message to be transmitted on detection of a Built In Integrity Test

failure (BIIT failure). Such a failure may indicate a problem with the transceiver and it may be prudent to warn

vessels not to rely on the information provided by the transceiver in this situation. Note that the health of the

transceiver is always transmitted as part of the standard Aids to Navigation position report (message #21),

however the status contained in that message may not be shown on all display systems.

The available actions on BIIT failure are:

Congure BIIT failure

message action

Congure vessel

proximity alert action

Congure additional

o position alert action

Configuration using proAtoN

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●No action - no message is transmitted on detection of a BIIT failure

●Transmit message #14. A broadcast text message is transmitted on detection of a BIIT failure. The

text content of the message must be defined in the ‘Message text’ box.

●Transmit message #12. An addressed text message is transmitted on detection of a BIIT failure. The

destination for the addressed message is configured on the ‘Real AtoN’ tab (see section 7.3.1)

In addition to configuration of the BIIT failure action a schedule for the associated message must be configured

in the ‘Message schedule’ tab.

●Message #14 Index 1 must be configured if the message #14 action is selected.

●Message #12 Index 1 must be configured if the message #12 action is selected.

Vessel proximity alert

This section allows configuration of the text message to be transmitted on detection of vessel breaching a

defined radius (or guard ring) around the transceiver. This message can be used to warn approaching vessels

of potential collision with the AtoN. The addressed message is automatically sent to all vessels that breach the

guard ring radius.

The available vessel proximity alert actions are:

●Disable message #12 - the vessel proximity alert function is disabled

●Enable message #12 - the function is enabled and the text content of the message to be transmitted

must be defined in the ‘Message text’ box. The guard ring radius for the proximity alert must also be

configured in the ‘Radius’ box; note that the value is set in metres.

In addition to configuration of the vessel proximity alert a schedule for the associated message must be

configured in the ‘Message schedule’ tab.

●Message #12 Index 2 must be configured if the message #12 action is selected.

Off position alert

This section allows configuration of the text message to be transmitted when the transceiver detects that it is

off position. The settings for off position detection are made on the ‘Real AtoN’ tab (see section 7.3.1). The

configuration of an alternate message #21 reporting schedule when off position is independent of the

configuration of this text alert.

The available off position alert actions are:

●Disabled - no text message is transmitted when the transceiver determines that it is off position

●Transmit message #14. A text message is broadcast when the transceiver detects that is off position.

The text content of the message must be defined in the ‘Message text’ box.

●Transmit message #12. An addressed text message is transmitted on detection of an off position

condition. The destination for the addressed message is configured on the ‘Real AtoN’ tab (see

section 7.3.1)

In addition to configuration of the vessel proximity alert a schedule for the associated message must be

configured in the ‘Message schedule’ tab.

●Message #14 index 2 must be configured if the message #14 action is selected

●Message #12 index 3 must be configured if the message #12 action is selected

7.3.7 Status input configuration tab

AIS AtoN position reports (message #21) contain status information encoded as a bit sequence. The status

bits contain the basic operational state of a connected lamp and RACON along with the overall health of the

transceiver itself. Connection of a lamp and/or RACON is optional and requires equipment with a suitable

health output. Interfacing of lamp and RACON status is described in sections 6.1.1, 6.1.3 and 6.2.4.

The status information can be obtained from one of three sources as described in section 6.1.3. The status

input configuration tab is used to set the source and other associated parameters. The layout of the status input

configuration tab is provided in Figure 23.

Configuration using proAtoN

Page 40

Figure 23 Status input configuration tab layout

Current status (message 21)

This section shows the current lamp and RACON status determined by the transceiver. The transceiver must

be connected and powered from a DC supply in order for this display to operate correctly.

Lamp & RACON configuration

This section allows the fixed parameters of the lamp and RACON to be configured. The check boxes should

be set according to the physical configuration. For example if a lamp status output is connected to the

transceiver then the ‘Lamp fitted’ check box should be checked. If a RACON is connected it is also possible to

define if the RACON is monitored or not.

Status bit source

Select the source for the status information to match the method used to provide status information to the

transceiver (this is described in section 6.1.3).

Status bit logic

The logical sense of the physical status bit inputs (at either the basic or extended sensor interfaces) can be set

here. This allows for interface of equipment with active high or active low status outputs.

7.4 Transceiver diagnostics

The proAtoN application provides a number of features to assist with installation of an AIS AtoN and diagnosis

of fault conditions. These features are available through the GPS, Diagnostics and Serial Data tabs in proAtoN.

7.4.1 GPS tab

The GPS tab shows the status of the GNSS receiver built into the transceiver. This provides an indication of

the quality of the GNSS satellite signals being received along with the current position of the transceiver.

At least four satellites with a carrier to noise ratio in excess of 40 dBHz are required for an acceptable position

fix. Relocating the transceiver or connecting an external GNSS antenna can help improve the signal quality

and resulting position accuracy.

Current status display

(when connected to transceiver)

Set xed status as installed

Set status bit source

Set status input logic

Configuration using proAtoN

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The internal GNSS receiver supports SBAS (Satellite Based Augmentation Service) to enable improved

accuracy and integrity of GNSS position fixes. The availability of SBAS depends on the installation location of

the transceiver (the WAAS SBAS service covers most of the US and the EGNOS service covers Europe).

7.4.2 Diagnostics tab

The Diagnostics tab provides system version and status information. This information may be required when

requesting technical support for the product.

AtoN Details

●The connected AtoN Type is displayed as Type 1 or Type 3

●The application and bootloader software versions for the connected AtoN are displayed

●The serial number of the connected AtoN is displayed

Power status

●The VHF antenna VSWR (Voltage Standing Wave Ratio) as measured at the last AIS transmission is

displayed. This value is for indication only. A value better than 3:1 is expected for a good antenna

system. The alarm limit for antenna VSWR is set to 5:1. A perfect antenna would give a VSWR of 1:1.

●The system supply voltage is displayed in volts. The supply voltage must be between 9.6V and 32.6V

for correct operation. The supply voltage alarm will activate outside of this supply voltage range.

Report generation

Clicking the ‘Generate’ button will produce full report of the transceiver status. This report may be requested

by technical support personnel. After clicking the button select a suitable location for the report file before

clicking save.

Reported messages

During operation the transceiver will output a variety of status messages relating to the current operating state.

These messages are for information only and do not represent a fault condition.

Message text Description / Resolution

TX attempt failed

(msg 6 no payload re-broadcast data)

A transmission of message #6 has failed as the

payload data required for this message was not

provided (by either the extended sensor interface, or

an external system). The likely cause is a

configuration error relating to data capture.

TX attempt failed

(msg 8 no payload re-broadcast data)

A transmission of message #8 has failed as the

payload data required for this message was not

provided (by either the extended sensor interface, or

an external system). The likely cause is a

configuration error relating to data capture.

TX attempt failed

(msg 12 no payload re-broadcast data)

A transmission of message #12 has failed as the

payload data required for this message was not

provided (by either the extended sensor interface, or

an external system). The likely cause is a

configuration error relating to data capture.

TX attempt failed

(msg 14 no payload re-broadcast data)

A transmission of message #14 has failed as the

payload data required for this message was not

provided (by either the extended sensor interface, or

an external system). The likely cause is a

configuration error relating to data capture.

Configuration using proAtoN

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Active alarms

The transceiver incorporates BIIT (Built In Integrity Test) routines which continuously monitor key operating

parameters. Should an integrity test fail the failure will be indicate in the active alarms area.

Standby blocked: Off position algorithm The transceiver can’t enter standby (low power) mode

because the ‘off position’ algorithm has detected an

off position condition. Moving the transceiver within

the configured operating radius will resolve this.

Standby Blocked: Acquiring GPS The transceiver can’t enter standby (low power) mode

because it is currently acquiring a GNSS position fix.

Standby operation will resume when a fix is acquired.

Standby disabled Standby mode (low power operation) is disabled by

configuration.

Standby Blocked: USB connected The transceiver will not enter standby (low power)

mode whilst the USB interface is connected to a PC.

Standby Blocked: Shell running The transceiver will not enter standby (low power)

mode whilst the configuration shell is active.

Standby Blocked: Receivers enabled The transceiver can’t enter standby mode if the

current configuration requires that the receivers are

active.

Exiting standby Information only on exit of standby mode.

Entering standby for xx seconds Information only on entry to standby mode.

Alarm text Description / Resolution

Tx Malfunction A transmitter malfunction has been detected - please

contact your supplier.

Antenna VSWR exceeds limits The VHF antenna VSWR is above the permitted limit.

Check the VHF antenna, cable and connections are

sound. The VSWR measured at the last transmission

is displayed on the proAtoN diagnostics tab.

Rx Channel 1 malfunction A receiver malfunction has been detected - please

contact your supplier.

Rx Channel 2 malfunction A receiver malfunction has been detected - please

contact your supplier.

EPFS failure No position is available from the internal GNSS

receiver - please contact your supplier.

DGNSS input failed No data is available from the external source of

differential GNSS correction data. Please check

connections, baud rate and equipment configuration.

Message text Description / Resolution

Configuration using proAtoN

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7.4.3 Serial data tab

The serial data page shows all data output from the transceiver in NMEA0183 / IEC61162-1 format. It is also

possible to send NMEA0183 / IEC61162-1 commands to transceiver if required for technical support or custom

configuration. A facility to record the data to a file is provided by clicking the ‘Log to File’ button.

Certain sentence types can be filtered out of the output window by checking the relevant sentence type in the

‘Filters’ section of this tab.

7.5 Other features

The proAtoN application provides the following additional features to support transceiver installation and

upgrade.

7.5.1 Offline configuration

A complete AtoN configuration including all schedule parameters, virtual AtoN configuration and other settings

can be saved to a file. This feature allows a configuration file to be created without access to the transceiver

hardware. The file can be loaded at a later time and synchronised with the transceiver hardware.

This feature is available using the ‘Save File’ and ‘Load File’ items available on the File menu. The configuration

is saved as a .pad file using a format proprietary to the proAtoN application.

When the proAtoN application is launched a new blank configuration file is created. You will be prompted to

save this file if changes are made without saving the file prior to closing the application, or if a ‘New file’ is

created from the File menu.

7.5.2 Upgrade to Type 3 AtoN

This option is available in the ‘Tools’ menu and can be used to upgrade a Type 1 transceiver to a Type 3

transceiver following purchase of an upgrade key from your dealer. Please contact your dealer to purchase an

upgrade key; you will be required to provide the transceiver serial number displayed on the diagnostics tab.

Supply voltage The transceiver power supply voltage is outside of the

permitted range. The measured supply voltage is

displayed on the proAtoN diagnostics tab.

Low forward power The transmitter forward power is below a preset limit -

please contact your supplier.

Synchronisation lost Timing information is not available from the internal

GNSS receiver - please contact your supplier.

Alarm text Description / Resolution

Operation

Page 44

8 Operation

Once configured and connected to a power supply and antennas the transceiver will operate autonomously.

Correct operation can be confirmed by checking for reception of Aids to Navigation reports (message 21) using

another AIS device.

8.1 Standby operation

During operation the transceiver will enter a low power standby mode between scheduled transmissions. The

unit will not enter standby mode under the following conditions.

●USB interface connected - the transceiver will not enter standby mode whilst the USB interface is

connected to a PC. The USB interface should be disconnected once the AtoN is configured and

deployed.

●GPS acquisition - the transceiver will not enter standby mode for the first 12 minutes of operation with

GPS position available after power is first applied. This period is used to acquire the current number

of UTC leap seconds from the GPS system. This only occurs at initial power up and subsequently on

four occasions during each calendar year when it is possible for the number of leap seconds to

change.

●Off-position algorithm - the transceiver will not enter standby mode when the off position algorithm is

active and the transceiver is determined to be off position. Whilst off position the GPS receiver is

permanently enabled in order to monitor the position according to the algorithm provided in IALA

A-126 Annex A1. Should the transceiver return on position standby operation will resume

During operation the transceiver will output AITXT sentences to the NMEA0183 port 1 indicating any conditions

blocking entry to standby mode.

T1 T1+S

T3+S

If entry into standby mode is blocked by one or more of these conditions the power

consumption of the transceiver will increase significantly.

Data messages and data sources

Page 45

9 Data messages and data sources

The transceiver can be configured to transmit a range of data messages in addition to the standard AIS AtoN

position report. The purpose, content and means of configuring supported message types is described in the

table below.

Configuration of the AtoN for capture of data for messages #6 and #8 is described in the following sections.

The options available for data capture depend on the transceiver variant.

9.1 Product variants without the extended sensor interface

The data payload for binary messages #6 or #8 must be provided by external equipment interfaced to the

transceiver using the transceiver NMEA0183 port 1 available at the Power and transceiver interface connector

described in section 5.5.1. The payload data for the message is requested by the transceiver using a

proprietary MCR sentence and provided by the external equipment using the MPR sentence defined in section

10.2.10. Full detail of the protocol for interface of external equipment using this interface is available in an

application note “Interfacing third party sensor interfaces” which is available on request from your supplier.

ID Message

type Description and use Content sources

6 Addressed

binary data

This message is addressed to another

individual AIS station, usually an AIS base

station, which is configured to decode the

message content. The message content is

binary data in a standardised or proprietary

format. The message may be used to

communicate status information about the

AtoN and / or metrological and hydrological

data captured at the AtoN.

The binary content for this

message can be generated by

the extended sensor interface,

or provided by suitably

configured third party

equipment. See sections 9.1

and 9.2 for further information.

8 Broadcast

binary data

This message is broadcast to all other AIS

stations. The message content is binary data in

a standardised or proprietary format. The

message may be used to communicate status

information about the AtoN and / or

metrological and hydrological data captured at

the AtoN.

The binary content for this

message can be generated by

the extended sensor interface,

or provided by suitably

configured third party

equipment. See sections 9.1

and 9.2 for further information.

12 Addressed

safety

message

This message is addressed to another

individual AIS station and contains safety

related text. The text can warn of a failure of

the AtoN equipment, alert an approaching

vessel to danger of collision with the AtoN or

indicate that the AtoN is operating off position

See section 7.3.6 for further

information.

14 Broadcast

safety

message

This message is broadcast to all other AIS

stations and contains safety related text. The

text can warn of a failure of the AtoN

equipment or indicate that it is operating off

position

See section 7.3.6 for further

information.

Data messages and data sources

Page 46

9.2 Variants with the extended sensor interface

The extended sensor interface provides a wide range of input and output capabilities as listed in section 6.2.

The transceiver is supplied ready with direct support for a specific set of external sensing equipment and AtoN

status inputs. The extended sensor interface can also be adapted through software changes to support almost

any equipment that might be encountered in an AtoN application. If your application requires interface to

equipment other than that listed here please contact your supplier to discuss your requirements.

The default configuration of the extended sensor interface provides:

●Data for message #8, DAC 001, FI 31 for IMO Metrological and Hydrological data

○Metrological data is captured from an Airmar PB200 weather station

○Hydrological data is captured from an Impress Sensors & Systems S12C pressure and

temperature sensor (SDI-12 interface sensor)

●Data for message #6, DAC 235, FI 10 for UK GLA AtoN monitoring message

○Data is captured from voltage measurements and other inputs to the extended sensor interface

○See IALA A-126, Annex C, Example 1 for the definition of this message structure

9.2.1 Configuration for message #8 (DAC 001, FI 31) for Metrological and Hydrological data

In order to transmit this message the transceiver must be appropriately configured and interfaced to compatible

sensors which are also configured as described below.

Transceiver configuration

The transceiver must be configured with a schedule for message #8 index 1.

●The schedule can be either FATDMA or RATDMA. The recommended interval for this message is 12

minutes (27000 slots). Configure the transceiver with a schedule for message #8 index 1 using

proAtoN following the guidance in section 7.3.2.

●Note that each message #8 FI 31 occupies two slots.

●In order for the sensors to be detected and configured appropriately they must be connected to the

transceiver and powered prior to application of power to the transceiver.

Airmar PB200 Weather station connection

Metrological information is collected by an Airmar PB200 weather station connected to the transceiver

extended sensor interface. The NMEA0183 interface variant of the PB200 weather station is required.

The installation must provide a suitable power supply (and optional heater power supply) for the PB200

weather station as this is not provided by the transceiver. Please refer to Airmar product documentation for

power supply requirements.

The wiring information below relates to the NMEA0183 cable description in revision 06 of the PB200 installation

instructions. Please confirm the signal names and wiring colours with the latest installation guide supplied with

the PB200 prior to connection. The sensor is connected to the extended sensor interface NMEA0183/RS422

port available at the transceiver sensor interface connector X.

Transceiver sensor

interface connector X pin

and function

Signal description

PB200

NMEA0183

cable wire

colour

PB200

number

PB200

signal

name

D (S_RS422_TX1_A) Data from transceiver to sensor Yellow 7 A/+ IN

E (S_RS422_TX1_B) Data from transceiver to sensor Orange 8 B/- IN

F (S_RS422_RX1_A) Data from sensor to transceiver White 3 A/+ OUT

G (S_RS422_RX1_B) Data from sensor to transceiver Blue 9 B/- OUT

T1+S

T3+S

Data messages and data sources

Page 47

Impress S12C pressure and temperature sensor connection

Water pressure (depth / tide level) and temperature are collected by an Impress Sensors & Systems S12C

sensor connected to the transceiver extended sensor interface. The S12C sensor communicates using an

SDI-12 bus data interface (see section 6.2.8 for further information).

The installation must provide a suitable power supply for the SDI-12 bus as this is not provided by the

transceiver. Please refer to the S12C sensor documentation for power supply requirements.

The sensor is connected to the extended sensor interface SDI-12 port available at the transceiver sensor

interface connector Y. A ground for the SDI-12 bus is also required and this may be obtained at any one of the

GND pins listed in the tables.

Impress S12C pressure and temperature sensor configuration

The SDI-12 bus address of the S12C sensor must be configured as zero (the default address) in order for it to

be detected by the transceiver.

Data mapping for message #8 (DAC 001, FI 31) for Metrological and Hydrological data

The mapping of data collected by the sensors to the message #8 FI 31 data fields is provided in the table below.

Transceiver sensor interface

connection

Signal

description

S12C sensor

wire colour

S12C signal

name

Sensor interface connector Y,

Pin E (SDI_DATA)

SDI-12 bus

data line

Yellow SDI-12 output

Sensor interface connector X,

Pin T (GND)

Power and transceiver interface

connector Pin N or S

GND

Connect also

to SDI-12

bus supply

GND

Blue Supply- (0V)

Message #8 FI 31 data

field Data source Notes

Longitude Transceiver internal GNSS

Latitude Transceiver internal GNSS

Position accuracy Transceiver internal GNSS

Time stamp Transceiver internal GNSS

Average wind speed Airmar PB200 weather station

WIMWD wind speed output

The wind speed provided by the

sensor is averaged over 10

minutes before output

Wind gust Airmar PB200 weather station

WIMWD wind speed output

This value is the peak wind

speed recorded during the

previous 10 minute period

Wind direction Airmar PB200 weather station

WIMWD wind direction output

The wind direction provided by

the sensor is averaged over 10

minutes before output

The wiring information below relates to the cable description provided with the S12C sensor at

the time of writing. Please confirm the signal names and wiring colours with the latest

installation guide supplied with the S12C prior to connection.

Data messages and data sources

Page 48

Wind gust direction Airmar PB200 weather station

WIMWD wind direction output

The direction of the wind at the

peak wind speed during the

previous 10 minute period

Air temperature Airmar PB200 weather station

WIMDA air temperature output

The air temperature provided by

the sensor is averaged over 10

minutes before output

Relative humidity NA Data not provided

Dew point NA Data not provided

Air pressure Airmar PB200 weather station

WIMDA barometric pressure

output

The barometric pressure

provided by the sensor is

averaged over 10 minutes

before output

Air pressure tendency Airmar PB200 weather station

WIMDA barometric pressure

output

The air pressure is monitored

over a 30 minute period and

‘steady’, ‘increasing’ or

‘decreasing’ tendency reported

as appropriate

Horizontal visibility NA Data not provided

Water level IMPRESS S12C sensor water

level

Water level averaged over the

data reporting interval specified

for this message.

Water level trend NA Data not provided

Surface current speed NA Data not provided

Surface current

direction

NA Data not provided

Current speed #1, #2

and #3

NA Data not provided

Current direction #1, #2

and #3

NA Data not provided

Current measuring level

#1, #2 and #3

NA Data not provided

Significant wave height NA Data not provided

Wave period NA Data not provided

Wave direction NA Data not provided

Swell height NA Data not provided

Swell period NA Data not provided

Swell direction NA Data not provided

Sea state NA Data not provided

Water temperature IMPRESS S12C sensor water

temperature

Current temperature reported by

the sensor

Message #8 FI 31 data

field Data source Notes

Data messages and data sources

Page 49

9.2.2 Configuration for message #6, DAC 235, FI 10 for UK GLA AtoN monitoring message

In order to transmit this message the transceiver must be appropriately configured and interfaced to

appropriate signals as described below.

Transceiver configuration

The transceiver must be configured with a schedule for message #6 index 1.

●The schedule can be either FATDMA or RATDMA. The recommended interval for this message is 12

minutes (27000 slots). Configure the transceiver with a schedule for message #6 index 1 using

proAtoN following the guidance in section 7.3.2.

●The destination MMSI for addressed messages must also be configured as described in section

7.3.1. This should be the MMSI of a shore station that will receive and display the monitoring

message

●Note that each message #6 FI 10 occupies one slot.

Data mapping for #6, DAC 235, FI 10 for UK GLA AtoN monitoring message

The data mapping from the extended sensor interface inputs to the message #6 FI 10 fields is defined in the

following table.

Precipitation (type) NA Data not provided

Salinity NA Data not provided

Ice NA Data not provided

Message #6 FI 10 data

field Data source Notes

Analogue voltage

(internal)

Supply voltage to the transceiver No additional connections are

required for this measurement

Analogue voltage

(external 1)

Extended sensor interface

isolated analogue input 1

See pin allocation in section

5.5.4 and input description in

section 6.2.1

Analogue voltage

(external 2)

Extended sensor interface

isolated analogue input 2

See pin allocation in section

5.5.4 and input description in

section 6.2.1

Status bits (internal, 5

bits)

Copy of status bits used in

message #21

See section 7.3.7 for information

on configuration of status

source.

Status bits (external, 8

bits)

Bit 0 - Isolated digital input 1

Bit 1 - Isolated digital input 2

Bit 2 - Isolated digital input 3

Bit 3 - Isolated digital input 4

Bit 4 - Isolated digital input 5

Bit 5 - Set to 1 if lamp current

sense >=100mA, else set to 0

Bit 6 - non isolated digital input 1

Bit 7 - non isolated digital input 2

See sections 5.5.3 and 5.5.4 for

pin allocations and sections

6.2.3, 6.2.4 and 6.2.5 for

descriptions of these inputs.

Off position status Transceiver off position algorithm No additional connections are

required for this measurement

Message #8 FI 31 data

field Data source Notes

Manual configuration

Page 50

10 Manual configuration

The transceiver is configured using standardised NMEA0183 (IEC61162-1/2) sentences developed for

configuration of AIS Aids to Navigation transceivers.

10.1 Basic Type 1 AIS AtoN configuration (FATDMA operation)

The following information is the minimum required configuration for a Type 1 AIS AtoN reporting message #21

only.

●The AtoN station must be configured with the 'real' AtoN MMSI using the AID command.

●The AtoN station must be configured with an Name, Charted position, operating radio channels and

dimensions using the ACF and ACE commands.

●The AtoN should be configured to broadcast message 21 using the AAR command. Note that the

slots selected for the AIS AtoN transmissions in FATDMA mode must be reserved by a base station

operating in the area in which the AIS AtoN will be deployed.

10.2 NMEA0183 / IEC61162 configuration sentences

The following section documents the standardised NMEA0183/IEC61162 sentences used for AIS AtoN

configuration and control.

Please refer to IEC61162-1 (Edition 4) for complete details of the configuration sentence structure.

The configuration sentence formats described in this section are used to both configure the device and as the

response format from the device when queried for current status. The query command format is as follows:

For example the query command $ECAIQ,AAR*21 requests the transceiver output an AAR sentence

containing the currently configured broadcast rates for the AtoN station.

Configuration sentences are communicated using the transceiver USB interface.

10.2.1 AAR - Configure broadcast rates for AtoN station

This sentence assigns the schedule of slots that will be used to broadcast Message 21 and other allowed AIS

AtoN Station messages. It provides the start slot and interval between the slots used for consecutive

transmissions for the message. The AIS AtoN Station should apply the information provided by this sentence

to autonomously and continuously transmit the VDL messages until revised by a new AAR sentence. The AIS

AtoN Station, upon receipt of an AAR Query for this information, will generate sentences for configured

messages providing the current broadcast schedule. New AAR assignments will override existing AAR

assignments.

T1 T1+S

T3+S

$--AIQ

ccc

*hh<CR><LF>

Sentence formatter of data being requested

(

e.g.,AAR)

$--AAR,xxxxxxxxx,xx,xx,xx,xx,xxxx,x.x,x,xx,xx,xxxx,x.x,a*hh<CR><LF>

Sentence status flag (see note 7)

Slot interval channel 2 (see note 6)

Start slot channel 2 (see note 5)

UTC minute for channel 2

UTC hour for channel 2

FATMA or RATDMA setup (see note 4)

Slot interval channel 1 (see note 6)

Start slot channel 2 (see note 5)

UTC minute for channel 2

UTC hour for channel 2

Message ID index (see notes 3 & 8)

Message ID (see note 2 & 8)

MMSI (see notes 1 & 8)

Manual configuration

Page 51

10.2.2 ACE - Extended general AtoN Station configuration

This sentence and the ACF sentence are used to configure the AtoN Station parameters when it is initially

installed, and later in order to make changes to the way it operates. This sentence supports system

administration of the AIS AtoN Station operation.

Note 1 The MMSI is defined in the AID sentence. This field contains the linkage between the MMSI definition (AID),

Message 21 configuration (ACF, and ACE) and scheduling (AAR) of Message 21 transmissions.

Note 2 Message ID is the message identification of the message being scheduled. When Message ID is 0 this indicates

that the slots being defined will be used for chaining messages. These slots are not reserved on the VDL via a

Message 20 until the competent authority requires their use and will reserve the slots at that time for the proper

duration. These slots can be used for chaining or for MPR single transmission.

Note 3 Message ID Index is used when there are multiple versions of a Message ID. This index value should start at 1.

Note 4 Used to select whether the AAR is configuring an FATDMA schedule or RATDMA/CSTDMA schedule (0 indicates

FATDMA, 1 indicates RATDMA)

Note 5 For all messages which need to be transmitted in FATDMA mode, starting slot ranging from −1 to 2249 should be

used. A value of –1 discontinues broadcasts of the message when the AAR sentence is sent to the AtoN Station,

and indicates that no message has been broadcast if the AAR sentence is received from the AtoN Station. A null

field indicates no change to the current start slot setting when sent to the AtoN Station, and indicates that the start

slot has not been set, i.e. is unavailable, when the AAR sentence is received from the AtoN Station. For an

RATDMA transmission schedule, this field will be Null.

Note 6 For all messages which need to be transmitted, in FATDMA mode slot Interval ranging from 0 to (24*60*2250;once

per day) and in RATDMA/CSTDMA mode, time interval ranges from 0 to (24*60*60) s. A null field indicates no

change to the current slot interval setting when sent to the AtoN Station, and indicates that the slot interval has not

been set, i.e. is unavailable, when the AAR sentence is received from the AtoN Station.

Note 7 This field is used to indicate a sentence that is a status report of current settings or a configuration command

changing settings. This field should not be null.

“R’ = sentence is a query response

“C” = sentence is a configuration command to change settings.

Note 8 The MMSI/Message ID/Message ID index are used to reference a table of messages loaded using MPR,

ACF/ACE; this sentence defines the broadcast schedule for each message. Each message in this table is

referenced by the combination of MMSI, Message ID, and Message ID index.

Note 1 AtoN status bits, indication of the AtoN status, default “00hex”: for a Virtual AtoN, this field should be

00hex. The three most significant bits represent the page ID.

Note 2 The off-position indicator is generated when this threshold is exceeded (distance in metres).

Note 3 Determines the behaviour of AtoN for message acknowledgement (Message 7 and 13):

0 will provide acknowledgement as defined by manufacturer,

1 will not provide acknowledgement.

Note 4 Off-position behaviour:

0 – maintain current transmission schedule,

1 – use new reporting interval configured by AAR using message ID index.

Note 5 Synch lost behaviour:

0 – silent,

1 – continue as before.

Note 6 Name of the AtoN: maximum 34 characters.

Note 7 Reference point of reported position; should be given as dimension (aaabbbccdd) of the buoy.

(See IALA A-126)

Sentence status flag (see note 8)

Dimensions (see note 7)

Name of AtoN (see note 6)

Synch lost behaviour (see note 5)

Off position behaviour (see note 4)

cknowledgment procedure (see note 3)

Off position threshold (see note 2)

toN status bits (see note 1)

MMSI

$--ACE,xxxxxxxxx,hh,xxxx,x,x,x,c--c,xxxxxxxxxx,a,*hh<CR><LF>

Manual configuration

Page 52

10.2.3 ACF - General AtoN Station configuration

This sentence and the ACE sentence are used to configure Message 21 content for the AtoN

Station and all of the Synthetic/Virtual AtoN Stations associated with the AtoN Station.

10.2.4 AFB - Forced broadcast

This sentence is used to force a transmission of the indicated VDL message, this message is already known

to the AIS AtoN Station through AAR/MPR or ACE/ACF/AAR configuration commands.

Note 8 This field is used to indicate a sentence that is a status report of current settings or a configuration command changing

settings. This field should not be null.

“R’ = sentence is a query response,

“C” = sentence is a configuration command to change settings.

Note 1 Identifies the source of the position, see ITU-R M.1371 Message 21 parameter (type of electronic position fixing

device).

Note 2 Nominal or charted position.

Note 3 0 = low > 10 m,

1 = high < 10 m; differential mode of DGNSS. VHF channel number, see ITU-R M.1084.

Note 4 VHF channel number, see ITU-R M.1084.

Note 5 0 = default manufacturer power level (nominally 12,5 W),

1 to 9 as defined by the manufacturer.

Note 6 Virtual AtoN flag

0 = Real AtoN at indicated position (default),

1 = Virtual AtoN,

2 = Synthetic AtoN (flag remains 0 in message 21 but the repeat indicator must be > than 0).

Note 7 This field is used to indicate a sentence that is a status report of current settings or a configuration command

changing settings. This field should not be null.

“R’ = sentence is a query response,

“C” = sentence is a configuration command to change settings.

Note 8 The MMSI/Message ID/Message ID Index are used to reference a table of messages loaded using

MPR/ACF/ACE. This sentence defines the broadcast schedule for each message. Each message in this table is

referenced by the combination of MMSI, Message ID and Message ID Index.

Note 1 If the start slot is null, the AtoN Station will use RATDMA for transmission.

Sentence status flag (see note 7)

Virtual flag (see note 6)

Type of AtoN

Power level (see note 5)

Tx channel 2 (see note 4)

Tx channel 1 (see note 4)

Rx channel 2 (see note 4)

Rx channel 1 (see note 4)

Position accuracy (see note 3)

Longitude – E/W (see note 2)

Latitude – N/S (see note 2)

$--ACF,xxxxxxxxx,x,llll.llll,a,yyyyy.yyyy,a,x,xxxx,xxxx,xxxx,xxxx,x,xx,x,a*hh<CR><LF>

Type of EPFS (see note 1)

MMSI (see notes 1 & 8)

Sentence status flag (see note 2)

Channel 1/2

Start slot (see note 1)

UTC minute for start slot

UTC hour for start slot

Message ID index

Message ID

MMSI

$--AFB,xxxxxxxxx,xx,xx,xx,xx,xxxx,x,a*hh<CR><LF>

Manual configuration

Page 53

10.2.5 AFC - AtoN function ID capability

This sentence is used to provide the capability information of implemented function ID by the EUT. This

sentence is initiated with a QAFC and the response is the AFC.

10.2.6 AID - MMSI configuration

This sentence is used to load, for an AtoN Station, its Real, Virtual and chained MMSI(s). The MMSI from the

factory shall be as defined by the manufacturer. Each AtoN Station will maintain a table of its MMSI(s) and the

messages associated with these MMSI(s). This sentence is also user to load the destination MMSI for

addressed messages. To set the destination MMSI using this sentence set the ‘Virtual, Real or Chained’ field

to 0. Note that only one destination MMSI can be configured

Note 2 This field is used to indicate a sentence that is a status report of current settings or a configuration command

changing settings. This field should not be null.

“R’ = sentence is a query response

“C” = sentence is a configuration command to change settings.

Note 1 Each bit corresponds to the function ID number and the bit value “0” indicates the function ID number is

not supported and “1” indicates supported. The most significant bit is function ID “0”.

Note 1 The MMSI of the station being addressed. The initial factory setting should be defined by the manufacturer, for

example 000000000.

Note 2 The indicator to define if the MMSI is being created/changed (1) or deleted (0). If own station MMSI is deleted it

should revert to the factory setting. If a Virtual AtoN is deleted, then all associated messages for that Virtual AtoN

are also deleted.

Note 3 The current MMSI to be created/changed/or deleted.

Note 4 Real AtoN, chained, or Virtual AtoN – Real is own station, chained indicates an MMSI that this station is

responsible for relaying messages to and from, a Virtual AtoN indicates an MMSI that this station is responsible for

generating at least a Message 21.

“R” – Real AtoN;

“V” = Virtual/Synthetic AtoN;

“P” = parent AtoN in the chain;

“C” = child AtoN in the chain.

“0” = Set destination MMSI for addressed messages.

Note 5 This field is used to indicate a sentence that is a status report of current settings or a configuration command

changing settings. This field should not be null.

“R’ = sentence is a query response,

“C” = sentence is a configuration command to change settings.

Status of implementation fro each function ID (see note 1)

MMSI

$--AFC,xxxxxxxxx, hhhhhhhhhhhhhhhh*hh<CR><LF>

Sentence status flag (see note 5)

Virtual, Real or Chained (see note 4)

MMSI (see note 3)

Create or delete MMSI (see note 2)

Current MMSI of the AtoN station (see note 1)

$--AID,xxxxxxxxx,x,xxxxxxxxx,a,a*hh<CR><LF>

Manual configuration

Page 54

10.2.7 AKE - Configure encryption key

This sentence assigns the encryption key that will be used by the AES algorithm to communicate configuration

and status information via the VDL. This sentence allows for the entire 128 bit encryption key to be entered,

the user must know the current encryption key. The initial encryption key, when shipped from the manufacturer,

will be all 0's.

10.2.8 ARW -Configure the receiver turn-on times

This sentence defines the operational period for the receivers. When chaining the duration of receiver wake up

time must be sufficient to allow correct operation of a chain.

10.2.9 MCR - Configure proprietary AtoN control

The payload of this sentence will be proprietary information used to control the AtoN Station.

Note 1 This field is used to indicate a sentence that is a status report of current settings or a configuration command

changing settings. This field should not be null.

“R’ = sentence is a query response,

“C” = sentence is a configuration command to change settings.

Note 1 0 = use interval setting as defined below;

1 = turn receiver on.

Note 2 Interval between receiver activation:

1 – 60 min if UTC hour is set to 24;

1 – 256 h if UTC hour is 0- 23;

(Note: 168 h is once per week).

Note 3 Maximum awake time (1 440 min is 24 h).

Note 4 This field is used to indicate a sentence that is a status report of current settings or a configuration command

changing settings. This field should not be null.

“R’ = sentence is a query response,

“C” = sentence is a configuration command to change settings.

Note 1 This field is used to indicate a sentence that is a status report of current settings or a configuration command

changing settings. This field should not be null.

“R’ = sentence is a query response,

“C” = sentence is a configuration command to change settings.

Sentence status flag (see note)

New AES encryption key

Current AES encryption key

MMSI of the AtoN station

$--AKE,xxxxxxxxx,c--c, c--c,a*hh<CR><LF>

Sentence status flag (see note 4)

Duration of receiver wake up (see note 3)

Receiver wake up interval (see note 2)

UTC minute

UTC hour

Receiver on or interval (see note 1)

MMSI of the AtoN station

$--ARW,xxxxxxxxx,x,xx,xx,xxx,xxxx,a*hh<CR><LF>

Sentence status flag (see note)

Payload up to the 80 character length

MMSI

$--MCR,xxxxxxxxx,c--c,a*hh<CR><LF>

Manual configuration

Page 55

10.2.10MPR - Message configuration of payload re-broadcast

This message will be used to command the AIS AtoN Station to rebroadcast the payload or to define a new

message for autonomous, continuous transmission. The AAR configuration with message ID/message ID

index for a specific MPR must precede the MPR to identify it as autonomous continuous transmission. If it is a

single transmission, this payload will be broadcast using the slots reserved by the AAR with message

ID/message ID Index = 0, or it will use the next available slot.

10.2.11TSP - Transmit slot prohibit

This sentence is used to prohibit an AIS station from transmitting in the specified slots. The AIS Station

receiving this sentence should not use the next occurrence of the indicated slots. This sentence is designed to

be used to protect interrogation responses from interference from Base Station transmissions and for use with

AtoN Stations. For an AtoN Station the Unique Identifier is the AtoN Station Real MMSI.

Note 1 The following messages are supported by ITU-R M.1371 Messages 6, 8, 12, 14, 25, 26 and other appropriate

messages.

Note 2 0 = use AAR definition,

1 = use next available slot.

Note 3 This field is used to indicate a sentence that is a status report of current settings or a configuration command

changing settings. This field should not be null.

“R’ = sentence is a query response,

“C” = sentence is a configuration command to change settings.

Note 1 The MMSI is defined in the AID sentence and is the MMSI of the Real AtoN.

Note 2 The sequential identifier provides an identification number from 0 to 99 that is sequentially assigned and is

incremented for each new TSP sentence. The count resets to 0 after 99 is used. This sequential identifier is used

to identify the Base Station’s response to this TSP-sentence when it replies with a slot prohibit status report (see

TSR-sentence).

Note 3 1 = Channel 1,

2 = Channel 2.

Note 4 This is for record keeping. It contains the hour, minute, and second of this request.

Note 5 This is the slot from which the following slot offsets are referenced.

Note 6 Slot offset of the first slot in the block of slots to be blocked from use by the Base Station.

0 indicates no prohibited slots.

Sentence status flag (see note 3)

Payload

Sequence number

Total number of sentences

Broadcast behaviour (see note 2)

Message ID index

Message ID (see note 1)

$--MPR,xxxxxxxxx,xx,xx,x,xx,xx,c--c,a*hh<CR><LF>

MMSI

$--TSP,c--c,x.x,x,HHMMSS.SS,x.x,x.x,x.x,x.x,x.x,x.x,x.x,a,a*hh<CR><LF>

Sentence status flag (see note 9)

Prohibit duration control (see note 8)

Consecutive time slots in third block (see note 7)

Slot offset of third block of consecutive time slots (see note 6)

Consecutive time slots in second block (see note 7)

Slot offset of second block of consecutive time slots (see note 6)

Consecutive time slots in first block (see note 7)

Slot offset of first block of consecutive time slots (see note 6)

Reference slot (see note 5)

UTC hour, minute and second of requested blocking of slot use (see no

Channel selection (see note 3)

Sequential identifier (see note 2)

MMSI (see note 1)

Manual configuration

Page 56

10.2.12VER - Version

This sentence is used to provide identification and version information about a talker device. This sentence is

produced either as a reply to a query sentence. The contents of the data fields, except for the unique identifier,

should be manufactured into the talker device. The unique identifier is the AtoN Station Real MMSI. In order to

meet the 79-character requirement, a "multi-sentence message" may be needed to convey all the data fields.

Note 7 Total number of consecutive slots to be blocked from use by the Base Station. The first slot of the block is also part

of the count. Therefore, the minimum value is 1.

1-5 = number of prohibited slots.

Note 8 This field is used to control the prohibited slots. This field should not be null.

C = immediately restore for use all slots currently prohibited from use,

E = the slot prohibition expires for the slots identified in this sentence after their next occurrence,

P = prohibit the use of slots identified in this sentence. Slots are restored for use using “C” or “R”,

R = restore the use of slots identified in this sentence.

Note 9 This field is used to indicate a sentence that is a status report of current settings or a configuration command

changing settings. This field should not be null.

“R’ = sentence is a query response,

“C” = sentence is a configuration command to change settings.

Note 1 The device type is used to identify the manufactured purpose of the device. Choice of the device type identifier is

based upon the designed purpose of the device. It is set into the equipment based upon the primary design of the

device and remains constant even if the user defined talker identifier feature is used (see BCF-sentence). For AIS

device types, use one of the following talker identifier mnemonics:

AB: independent AIS Base Station;

AD: dependent AIS Base Station;

AI: mobile class A or B (see IEC 61993-2 and IEC 62287-1) AIS station;

AL: limited AIS Base Station;

AN: AIS aids to navigation station;

AR: AIS receiving station;

AS: AIS physical shore station;

AT: AIS transmitting station;

AX: AIS simplex repeater station;

DU: duplex repeater station;

UP: microprocessor controller;

U#: (0 ≤ # ≤ 9) user configured talker identifier.

Note 2 The unique identifier is used for system level identification of a station, 15 alphanumeric character maximum. For

an AtoN Station, this is the Real AtoN MMSI number.

Note 3 The data field length may be 32 characters maximum. The length of 32 characters is chosen in order to be

consistent with similar data field lengths in the IEC 61162 standard. When large character lengths are used and the

80 character sentence limit would be exceeded for a single sentence, a series of successive VER sentences

should be used to avoid the problem (using data fields 1 and 2 to ensure the multiple VER sentences are properly

associated by the listener). Null fields can be used for data fields contained in other sentences of the series. Every

VER sentence shall contain the unique identifier.

Note 4 The manufacturer’s serial number for the unit. Note, this “internal” manufacturer’s serial number may or may not

match the physical serial number of the device.

Note 5 Vendor identification.

Note 6 Depending on the number of characters in each data field, it may be necessary to use a “multi-sentence message”

to convey a “VER reply.” The first data field specifies the total number of sentences needed, minimum value 1. The

second data field identifies the sentence number, minimum value 1.

$--VER,x,x,x,aa,c--c,c--c,c--c,c--c,c--c,c--c*hh<CR><LF>

Hardware revision (see note 3)

Software revision (see note 3)

Model code (see note 3

Manufacturer serial number (see notes 3 &4)

Unique identifier (see note 2)

Vendor ID (see note 5)

Device type (see note 1)

Sequential message identifier (see note 7)

Sentence number, 1 to 9 (see note 6)

Total number of sentences needed, 1 to 9 (see note 6)

Manual configuration

Page 57

10.3 Proprietary configuration sentences

The following section documents the proprietary NMEA0183/IEC61162 sentences used for AIS AtoN

configuration and control. These sentence relate mainly to configuration of data capture and integration with

external equipment.

10.3.1 Status Bit Source

The MCR SBS command is used to set the source for the AtoN status bits which are transmitted in AIS AtoN

position reports (message #21). Refer to sections 6.1.1 and 6.1.3 for further information on the available

interfaces for status information.

10.3.2 Status Bit Source Query

This command issued to query the transceiver for the current Status Bit Source configuration. The response

will be in the format described in 10.3.1.

10.3.3 Lamp / RACON configuration

The MCR LRC command is used to configure the fixed status of a connected Lamp and / or RACON. This

affects the setting of the related status bits transmitted in message #21.

Note 7 The third data field provides the sequential message identifier. The sequential message identifier provides a

message identification number from 0 to 9 that is sequentially assigned and is incremented for each new

multi-sentence message. The count resets to 0 after 9 is used. For a VER reply requiring multiple sentences, each

sentence of the message contains the same sequential message identification number. It is used to identify the

sentences containing portions of the same VER reply. This allows for the possibility that other sentences might be

interleaved with the VER reply that, taken collectively, contain a single VER reply. This data field may be a null field

for VER replies that fit into one sentence.

Note 1 Status bit source is either:

0 = ACE sentence provides status bits

1 = Transceiver basic IO connections provide status bits

2 = Extended sensor interface provides status bits (applies only to variants including the extended

Note 2 This field is used to indicate a sentence that is a status report of current settings or a configuration command

changing settings. This field should not be null.

“R’ = sentence is a query response,

“C” = sentence is a configuration command to change settings.

Note 1 This field is used to indicate a sentence that is a status report of current settings or a configuration command

changing settings. This field should not be null.

“R’ = sentence is a query response,

“C” = sentence is a configuration command to change settings.

Note 1 Set the lamp fitted status, 1 = lamp fitted, 0 = lamp not fitted

Note 2 Set the RACON fitted status, 1 = RACON fitted, 0 = RACON not fitted

Note 3 Set the RACON monitored status, 1 = RACON monitored, 0 = RACON not monitored

Sentence status flag (see note 2)

Status bit source (see note 1)

MMSI

$--MCR,xxxxxxxxx,SBS,x,a*hh<CR><LF>

Sentence status flag (see note 1)

MMSI

$--MCR,xxxxxxxxx,Q,SBS,a*hh<CR><LF>

Sentence status flag (see note 4)

RACON monitored (see note 3)

RACON fitted (see note 2)

Lamp fitted (see note 1)

MMSI

$--MCR,xxxxxxxxx,LRC,x,x,x,a*hh<CR><LF>

Manual configuration

Page 58

10.3.4 Lamp / RACON configuration query

This command issued to query the transceiver for the current Lamp / RACON configuration. The response will

be in the format described in 10.3.3.

10.3.5 General MCR query

$----Q,MCR*hh

This query command will return all the MCR commands as used for direct transceiver configuration.

A general query for MCR using $--Q,MCR will also return ACQ (Acquisition Configuration) information for all

messages. This is used as part of the configuration of a complete AtoN that includes a sensor module; the

information within the ACQ details the acquisition time the sensor module needs from the transceiver before a

transmission is going to take place, thus allowing the sensor module sufficient time to collect and average data

as required for a transmission.

When the AIS Transceiver is not configured with a sensor module the ACQ data is not required but will still get

displayed when queried.

Note 4 This field is used to indicate a sentence that is a status report of current settings or a configuration command

changing settings. This field should not be null.

“R’ = sentence is a query response,

“C” = sentence is a configuration command to change settings.

Note 1 This field is used to indicate a sentence that is a status report of current settings or a configuration command

changing settings. This field should not be null.

“R’ = sentence is a query response,

“C” = sentence is a configuration command to change settings.

Sentence status flag (see note 1)

MMSI

$--MCR,xxxxxxxxx,Q,LRC,a*hh<CR><LF>

Technical specification

Page 59

11 Technical specification

11.1 Applicable equipment standards

11.2 AIS Transceiver specification

11.2.1 Physical

11.2.2 Environmental

IEC62320-2

Edition 1.0, 2008

Maritime navigation and radiocommunication equipment and systems –

Automatic identification system (AIS) – Part 2: AIS AtoN Stations – Operational

and performance requirements, methods of testing and required test results

ITU-R M.1371-4

April 2010

Technical characteristics for an automatic identification system using time-division

multiple access in the VHF maritime mobile band

IEC61162-1

Edition 4.0, 2010

Maritime navigation and radiocommunication equipment and systems – Digital

interfaces – Part 1: Single talker and multiple listeners

IEC61162-2

Edition 1.0, 1998

Maritime navigation and radiocommunication equipment and systems –

Digital interfaces – Part 2: Single talker and multiple listeners, high-speed

transmission

IEC61108-1

Edition 1.0, 2002

Global Navigation Satellite Systems (GNSS) –Part 1: Global positioning system

(GPS) - Receiver equipment - Performance standards, methods of testing and

required test results

IEC60945

2002

Maritime navigation and radiocommunication equipment and systems –

General requirements – Methods of testing and required test results

SDI-12

Version 1.3, 2009

A Serial-Digital Interface Standard for Microprocessor-Based Sensors

Transceiver

dimensions

288mm (height) x 180mm (maximum diameter), excluding bird deterrent.

SRT Marine Systems plc 4180003 Carbon AIS Aid to Navigation Transceiver User Manual Carbon manual

Software Radio Technology plc Carbon AIS Aid to Navigation Transceiver Carbon manual

Contents

User manual - section 2

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