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Connecting external sensors and systems
Page 23
6 Connecting external sensors and systems
The transceiver can be interfaced to external sensors and systems for the transmission of sensor data via the
AIS network. Typically metrological and hydrological sensors are interfaced to the transceiver so that local
conditions can be shared with other AIS users.
The transceiver is available with and without extended sensor interfaces as described in section 4. Section 6.1
describes the interfaces available without the extended sensor interface while section 6.2 describes the
interfaces available with the extended sensor interface.
6.1 Basic transceiver interfacing
This section describes the interfaces available without the extended sensor interface. In this version of the
transceiver only the power and transceiver interface connector is used for connection of external equipment.
The interfaces available are:
● Five user configurable input/output signals
● A bi-directional NMEA0183 port
The transceiver also has the ability to measure the incoming power supply voltage. This measurement is used
by the transceivers BIIT (Built In Integrity Test) routines and can be used to trigger changes to the transceiver
health flag in AIS message #21 (the AtoN position report) or additional AIS alert messages if so configured.
6.1.1
Basic user configurable input / output signals
The basic user I/O signals are 3.3V logic level signals and configurable as inputs or outputs. These connections
can be configured as inputs and mapped to the AtoN status bits in AIS message #21 (the AtoN position report).
The default mapping of the signals is described in section 6.1.2. These connections are available via 18 way
connector 2 described in section 5.4.3. 
Configuration of the source and other settings for AtoN status information is described in section 6.1.3.
6.1.2
Basic Lamp and RACON status interfacing
Additional circuitry may be required to interface the lamp or RACON status outputs to the transceiver. Please
contact your supplier with details of the lamp or RACON for further information. 
T1
T1+S
T3
T3+S
!
Voltages above 3.3V must not be connected to these inputs. An external circuit and isolation
may be required to interface external equipment. Isolated status inputs are available with the
extended sensor interface and are described in section 6.2
.