Furuno NX-700A/B User Manual download pdf (Page 65)

4. INSTALLATION

4-19

Output data description

NRX: New NAVTEX received message

The NRX sentence is used to transfar the contents of a received NAVTEX message from the

NAVTEX receiver to another device. As the length of a single NAVTEX message may exceed the

number of characters permitted in a single sentence, many NRX sentences may be required to

transfer a single NAVTEX message.

$CRNRX,xxxx,x,x,x,xx,xx,xxxx,hhmmss,x.x,n--n*hh<CR><LF>

encapsulated message

error rate % (xx.x)

UTC of receipt of message

year

month (1-12)

day (0-31)

freq ('490', '518' or '4209')

number of lines in message (1 to 999)

line number (1 to 999)

message identifier (B

)

NOTE 1: The total number of sentences required to transfer the NAVTEX message from the

NAVTEX radio receiver. The first field specifies the total number of sentences used for a

message, minimum value 1. The Sentence Number field identifies the older of this sentence

in the message, minimum value 1. All sentences contain the same number of fields. For

efficiency it is recommended that null fields be used in the additional sentences where the

data is unchanged from the first sentence (this applies to fields 4 through 12).

NOTE 2: The sequential message identifier provides a unique identifier for each NAVTEX

message represented by a group of sentences. Though the message code (field 4) contains

a NAVTEX message serial number, there are special cases when the message serial

number is set to 00 and has a different meaning or when the same message code can occur

more than once. When these conditions occur, the sequential message identifier can be

relied upon to uniquely identify this NAVTEX message from other NAVTEX messages with

the same message code.

NOTE 3: The NAVTEX message code contains three related entities. The first character

identifies the transmitter coverage area and the second character identifies the type of

message. Both these characters are as defined in Table I of Recommendation ITU-R

M.625-3, combination numbers 1-26. Transmitter identification characters are allocated by

the IMO NAVTEX manual (IMO publication 951E). The remaining two characters are

restricted to numerals with a range of 00 to 99 and represent a serial number for each type

of message. The value of 00 is a special case and not considered a serial number.

NOTE 4: The frequency indicator identifies the frequency that the NAVTEX message was

received on:

0 = not received over air (eg test messages)

1 = 490 kHz

2 = 518 kHz

3 = 4209,5 kHz

4 through 9 are reserved for future use

NOTE 5: The total number of characters indicates the expected size of the message body

sent in this sequence of NRX sentences. It does not include the additional overhead for

reserved characters found in table 1 of IEC 61162-1.

NOTE 6: Status “A” is used for syntactically correct message reception. Status “V” is used for

syntactically incorrect message reception, e.g. end characters NNNN missing.

NOTE 7: The message body may contain reserved characters as defined in IEC 61162-1.

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Furuno NX-700A/B User Manual Page 65

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