Model: DDU-TM-44/46 or DDU-44/46
Doc. Ref. no. : - m06c/om/101
Issue no. 04
Page 31 of 36
User’s Manual
8. COMMUNICATION GUIDELINES
8.1 Serial Time Frame Input
8.1.1 NMEA-0183[RMC] Format
The $GPRMC sentence contains time and date of position fix, speed and course information. The
following examples show the contents of a typical RMC sentence:
The settings for this serial format is 9600, 8, N, 1.
The full data message of this format shall consist of data fields as follows:
Table 6 NMEA-0183[RMC] Format
Field
Example
Comments
Sentence ID
$GPRMC,
UTC Time
130525.00,
hhmmss.ss,
Status
A,
A = Valid/V = Invalid,
Latitude
4250.5589,
ddmm.mmmm,
N/S Indicator
S,
N = North/S = South,
Longitude
14518.5084,
dddmm.mmmm,
E/W Indicator
E,
E = East/W = West,
Speed over ground
000.1,
Knots,
Course over ground
245.0,
Degrees,
UTC Date
291206,
DDMMYY,
Magnetic variation
,
Degrees,
Magnetic variation
,
E = East/W = West,
Checksum
*25
*CC
Terminator
<CR><LF>
Non-printing characters
8.1.2 NGTS Format
The settings for this format are programmable. The full data message of NGTS format shall consist of 14
printable characters and a concluding CRLF as follows:
Table 7 NGTS Format
Description
Number of
Characters
Character
Position
Range of
Value/Information
Code Identification
1
1
Capital T
Year in Century
2
2,3
0 to 99
Month
2
4,5
1 to 12
Day of Month
2
6,7
1 to 31
Day of Week
1
8
1 to 7
Hours
2
9,10
0 to 23
Minutes
2
11,12
0 to 59
GMT Marker
1
13
0 or 1
Validity Marker
1
14
0 or 1
CRLF
2
15,16
Non-printing character
The transmission sequence shall be from the Code Identification character through to the CRLF with the
most significant digits being transmitted first.
The message shall become automatically available at one second prior to the clock minute epoch.
