Model: MC-1-M (2U)
Doc. Ref. no. : - m05/om/101
Issue no. 14
Page 65 of 103
User’s Manual
11. Timing Outputs – Serial, IRIG-B / IEEE 1344, NTP
11.1 Timing Output – Serial
11.1.1 NMEA-0183 RMC Time frame output
GPS Master Clock Model MC-1-M transmits NMEA time frame from COM1 terminal at rear panel of unit
at every 1 second at 9600 (baud rate), 8 (Data bits), N (NONE parity), 1 (1 stop bit). The NMEA-0183
$GPRMC serial time string contains time and date of position fix, speed and course information.
NOTE: The serial communication settings of COM1 terminal including type of frame, baud rate, parity and
stop bit are fixed and cannot be changed.
The full data message of this format shall consist of data fields as follows:
Field
Example
Comments
String 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-displayable characters
Table11.1: NMEA-0183 Time string format
The serial communication settings of COM1 terminal including type of frame,
baud rate, parity and stop bit are fixed and cannot be changed.
11.1.2 T-Format Time frame output:
GPS Master Clock Model MC-1-M transmits T-format time frame from COM2 terminal at rear panel of unit
at every 1 second at 9600 (baud rate), 8 (Data bits), N (NONE parity), 1 (1 stop bit). User can change the
serial communication settings using keypad on unit front panel as explained in section 9 or serial
configuration method on COM2 terminal as explained in section 10.2.2.
