LD2103 V3.0 Page 12 of 33
SRT Marine
Instruction Manual
SRT-MTB
©
Class B Marine AIS
Green (Unit operating OK)
Yellow (Warning)
Red (Fault)
Blue
(Status)
S
Using the transponder
Switching on
When the 12V supply is switched on all four LEDs visible on the front panel of the unit will illuminate twice for a period of one
second on each illumination. The red and blue LEDs will then go out. When the internal GPS starts outputting valid position
information and the TRANSAS AIS CLASS B unit transmits its first position report (message 18) the yellow LED will go out;
note that this process may take up to 30 minutes depending on the switch-on state of the GPS receiver. When the yellow LED
goes out the green LED will illuminate indicating that the unit is now operating correctly.
Switch functions
The blue switch on the front of the unit can be configured
either
to
trigger transmission of a "Safety Related Message" or to place the unit
into "Silent mode". This choice is made during configuration of the unit
using the proAIS application; please refer to the proAIS user guide for
further information on the configuration options.
When configured to transmit a "Safety Related Message" the button
will initiate broadcast of an AIS message containing the vessels MMSI
along with the text "MAYDAY MAYDAY". The button must be pressed
for at least two seconds to initiate this transmission and the blue LED
will illuminate to indicate the message has been sent. Additional
"Safety Related Messages" can not be sent until the blue LED has
extinguished which will occur one minute after an SRM has been sent.
When configured to place the unit into "Silent mode" each press of the switch will toggle the AIS transmitter on or off. The switch
must be depressed for two seconds to change the state of the transmitter. When the transmitter is off, the yellow "Warning" LED
and blue "Status" LEDs will be illuminated and the transponders position will not be broadcast to other vessels. The position of
other vessels will still be received by the unit.
Warning and fault states
If the unit has not been able to transmit a position report during the last expected two reporting intervals (i.e. the nominal
reporting interval cannot be maintained for operational reasons such as a Message 23 quiet period, high channel load
conditions, etc) the yellow LED will illuminate. This is a warning condition only and indicates that your vessels position is not
currently being reported to other vessels. Reception of other vessel AIS information by the TRANSAS AIS CLASS B is not
affected. When the unit is able to commence reporting the yellow LED goes out.
If a fault occurs the red LED will illuminate. This may illuminate briefly if the power supply is interrupted or if the VHF antenna
characteristics are briefly affected.
If the Red LED illuminates continuously the unit should be assumed to be faulty and should either be switched off (power
removed) or if this is not practical any other vessel position information derived from the unit should not be used and it should
also be assumed that the unit is not transmitting valid position information for your vessel.
The unit should be examined by a competent equipment maintainer at the earliest opportunity.
Data port messages
The data port will output the following:
•
(At power-up) boot-loader and main application splash text screens including version numbers, and memory status
