14
Detail
4
DSC operations in detail
4.1
MMSI Number
To operate VHF with DSC the equipment needs to be configured with vessel’s MMSI
number. If not configured before installation, the VHF will prompt for programming of the 9-
digit MMSI number, at start-up.
The vessel’s MMSI number is programmable from the DSC menu (4.5). It can be pro-
grammed only once from this menu after which changing of the programmed MMSI will be
possible only through the service interface.
If the MMSI number has been programmed correctly, the number is displayed in the default
idle display after start-up. It is recommended to turn the VHF off and on before use after
MMSI programming.
4.1.1
Sub-Addressed MMSI
The VHF supports setting the 10th digit of the MMSI number to a non-zero value. This is to
be used for being able to individually address multiple VHF’s on board a single vessel (with
the same 9-digit MMSI).
The 10th digit of the MMSI number can be programmed by the operator. After programming
the vessel MMSI number the 10
th
digit will always be set to 0.
Programming the 10
th
digit is done via the menu (4.5.6.1)
If the unit is configured to a non-zero X10 value, it will only respond to received individual
routine calls matching all 10 digits in the MMSI number. Transmitted routine calls or acknowl-
edgements to individual routine calls are using the self-ID with non-zero digit 10.
If X10 is programmed to zero the unit reaction modes, if receiving an individual call with non-
zero X10 in the address or self-ID, can be selected using the menu (4.5.6.2).
Selecting 1 Acknowledge non-zero, the unit will receive the call. A call acknowledgement
will be returned to exactly the same address as received in the self-ID (default after program-
ming the MMSI number).
Selecting 2 Acknowledge zero, the unit will receive the call. A call acknowledgement will be
returned to address as received in the self-ID, but with X10 set to zero.
Selecting 3 Reject call, will ignore the received call.
4.1.2
Using extended sub-address in a calling sequence
Entering the station call menu (1.1) allows you to address an RT call request to another radio
supporting the extended address format. If the receiver MMSI is not a coast station (00*), it is
possible to enter either 9 or 10 digits in the Enter Receiver MMSI window. Entering 9 digits
will automatically set the 10th digit to zero for the receiver address.
All other call flows than RT station call requests to a ship station are not supporting this
feature.
It is possible to create entries in the contact list with 9 or 10 digit MMSI numbers, unless they
are group station (0*) or coast station (00*) numbers.
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Summary of Contents for RT5020 VHF DSC Duplex
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