NavCom LAND-PAK Rev.N User Manual
Page 123
Technical Reference Manual Rev. N
Blk = All;
Blu = IOP w/Internal Radio
;
Red = IOP & LBM
;
Grn = Engine only
121
0x8d - Decoded RTCM Special Message (#16) - 14 + N bytes
This message contains the Decoded RTCM Special Message (#16) containing the decoded
GPS Week, Reference Station ID, Reference Station Health, and ASCII characters, usually
identifying the Reference Station.
Record
Usage
Command - No
Response - Yes
Input: Not used;
Output: reports reference station information from the RTCM 16 record
received
Ref
Message Field Description
Data
Type
Units
Range
Scale
Byte
Count
STX
02
(hex)
U08
1
PRA1 99 (hex)
U08
1
PRA2 66 (hex)
U08
1
ID
8d (hex)
U08
1
Length 0x00xx (14 + n)
U16
2
W1
Decoded GPS week, since Jan 6, 1980
U16
0 - 65535
2
W2
Decoded GPS time of week
U32
sec
0 - 604800 Lsb: 0.1
4
W3
Reference station ID
U16
2
W4
Reference station health
U08
1
Repetitive Block
Wn1
ASCII character per RTCM SC-104 v2.1
U08[] ASCII
1[]
End Repetitive Block
W5
Reserved
U08
1
CKSM Checksum
U08
1
ETX
03
(hex)
U08
1
1: Wn1 will be repeated N times for the length of the message; 90 bytes maximum.
2: An RTCM message will always be reported with an even number of ASCII characters.
Thus, if an odd character length RTCM message is decoded, then the first reported
ASCII character in the message string will be an ASCII ‘space’ (0x20) filler character.
3: W1 and W2 are filled with zeros at power-up until the first 0x8d message is decoded.