4. INSTALLATION
4-15
NRQ: Request NAVTEX messages
Command to request specific NAVTEX message(s) to be sent to IBS port. Messages may be
sent in any order. Each message sent from the IBS port shall be preceded by the NRX sentence.
$-NRQ,x,h,h*hh<CR><LF>
Note 1: the transmitter coverage area mask is defined as a 32 bit mask 0xFF.FF.FF.FF where
the least significant bit represents transmitter coverage area ’A’, the next bit is ’B’ and so on up
to bit 25 which is ’Z’. Bits 31-26 shall be set to ’0’. To select a transmitter coverage area its
corresponding bit shall be set to ’1’; to deselect a transmitter coverage area its corresponding
bit shall be set to ’0’.
Note 2: the message type mask is defined as a 32 bit mask 0xFF.FF.FF.FF where the least
significant bit represents message type ’A’, the next bit is ’B’ and so on up to bit 25 which is ’Z’.
Bits 31-26 shall be set to ’0’. To select a message type its corresponding bit shall be set to ’1’;
to deselect a message type its corresponding bit shall be set to ’0’.
NMK: Set NAVTEX mask
Command to set B
1
.B
2
mask for specific NAVTEX message(s) to be stored in internal message
memory & echoed to the IBS port.
$-NMK,x,h,h*hh<CR><LF>
Note 1: the transmitter coverage area mask is defined as a 32 bit mask 0xFF.FF.FF.FF where
the least significant bit represents transmitter coverage area ’A’, the next bit is ’B’ and so on up
to bit 25 which is ’Z’. Bits 31-26 shall be set to ’0’. To select a transmitter coverage area its
corresponding bit shall be set to ’1’; to deselect a transmitter coverage area its corresponding
bit shall be set to ’0’.
Note 2: the message type mask is defined as a 32 bit mask 0xFF.FF.FF.FF where the least
significant bit represents message type ’A’, the next bit is ’B’ and so on up to bit 25 which is ’Z’.
Bits 31-26 shall be set to ’0’. To select a message type its corresponding bit shall be set to ’1’;
to deselect a message type its corresponding bit shall be set to ’0’.
Example usage:
&NVNMK,518,00001E1F,00000023*42
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