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Red Book Graphic Message Format

The following NWWS weather data format will be used to stream the Red Book Graphic weather data on port 16000.

FIELD NAME	FORMAT	SIZE	COMMENTS
START_OF_MSG	SOH	1 Byte	- ASCII SOH character (0x01)
	CRCRLF	3 Bytes	(0x0D, 0x0D, 0x0A)
SEQ_NUM	nnn	3 Bytes	The sequence number will be "000"
	CRCRLF	3 Bytes	(0x0D, 0x0D, 0x0A)
WMO_HEADER	TTAAIIsCCCCsYYGGgg <sBBB>	18 to 22 Bytes	- ‘s’ is an ASCII space character (0x20) - <sBBB> is optional
	CRLF or CRCRLF	2 or 3 Bytes	(0x0D, 0x0A) or (0x0D, 0x0D, 0x0A)
AWIPS_ID	NNNXXX	6 Bytes	The AWIP ID will be "RDBOOK"
	CRCRLF	3 Bytes	- (0x0D, 0x0D, 0x0A)
GRAPHIC_TEXT	ENCODED GRAPHIC TEXT	N Bytes	- Graphic text
END_OF_MSG	CRCRLFETX	4 Bytes	(0x0D, 0x0D, 0x0A, 0x03)

To retrieve the Red Book Graphic data as NWSTG broadcasts, use the uudecode tool to decode the GRAPHIC_TEXT field. The decode file name will be TTAAII.CCCC[.BBB].ddhhmm. Where .BBB is optional.

The uudecode tool can be downloaded at various software Web sites, including http://www.tucows.com.