NGT-200 USER MANUAL
NGT-200 UM.E 20210520-02
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The request sent to AIS station contains the following DSC message in accordance
with ITU-R M.825-3 :
120, 120
Format specifier –
Individual call
41,30,00,33,30
MMSI requested station (
as example only
)
103
Category –
Information
41,30,00,55,50
Self-identification = tester’s MMSI no.
111
Message –
Report ship’s name/identification
117
End of sequence – Ack.RQ
xxx
ECC – modulus-2 checksum (can variate)
117,117
End of sequence – Ack.RQ
5.3.2
TEST AIS Class B
The
TEST AIS Class B
has following subitems:
AUTO TEST MODE
–
the automatic mode for
complex test of AIS station class B;
Interrogate Msg 18
– request for message
18 and wait for response;
Interrogate Msg 24
– request for message
24 and wait for response.
AUTO TEST MODE
– the automatic mode for complex test of AIS station class
B.
It is recommended to enter the MMSI number of
the AIS station before starting tests. This allows
ignoring the messages from other AIS stations.
It will help to perform tests by means of antenna
(through broadcast) in a port area.
You may directly input MMSI using numeric
buttons, or select the position by buttons
◄
and
►
, set it up by buttons
+
,
-
.
Press
Enter
after the MMSI code was input.
The 000000000 MMSI code means the filter is
not applied, so the device will receive all
messages from any AIS station.
=== TEST AIS-B ===
AUTO TEST MODE
Interrogate Msg 18
Interrogate Msg 24
== MMSI FILTER ==
MMSI: 000000000
Pow: 00 dBm
No filter
F1 – Clear filter
Start – ENTER
