T-GPS User Manual Version 1.2 | 39
7.3.9
Setting of the Output Time Interval of TXD1
In certain applications there is a requirement for an additional serial port output TXD1, which
may require a delayed output time. This is provided by menu option 14, which can be set as
follows: Set the output time interval of the second TXD1. Three settings can be made using the
and
‘+’
.
Press ‘
ENTER
’ to save.
•
LED displays 1 4 □ 1 ――――, the second TXD1 communicates once per hour.
•
LED displays 1 3 □ ――1 ――,
the second TXD1 communicates once per minute.
•
LED displays 1 3 □ ――――1, the second TXD1 communicates once per second.
7.4
Output Ports
The output message format for the Serial Port Output (TXD0) is as follows;
a)
Baud rate: 9600, 4800, 2400 and 1200 optional.
b)
Data format: one start bit, 8 information bits, one stop bit, XN (Exclusive Or Not) check,
check the time data between frame <T> and check bit, ASC II code.
c)
Information format: once per second, the format is as follows:
＜Ｓ＞＜Ｔ＞
D D D D D D D D D D D D D D D
＜Ａ＞
Note:
＜Ｓ＞
: start of pulse per second.
＜Ｔ＞
: start of frame.
H1: hour(tens). H2: hour(units)
M1: minute (tens), M2: minute(units)
S1: second(tens), S2: second(units)
D1: date(tens), D2: date(units)
M1: month(tens), M2: month(units)
Y1: year (thousands), Y2: year(hundreds), Y3: year(tens), Y4: year(units)
C: check byte
＜Ａ＞
: standard time end.
Here, ‘S’ is level with PPS rising edge.
For example, it is 08:20:30 Feb.10, 2020, when the T-GPS3000A is synchronised, the
information format sent by the T-GPS3000A is ST08203010022020 <F7H> A.
If the GPS has just powered-on, or has lost synchronisation, the information format will not
appear <S>, that is, the information outputted with the <T> as its frame head is not time-
synchronised, while information with <S><T> as its frame head has a synchronised time.
