Xylem H-339 - Manual (Page 11)

1-6 Operation
H-339
W ATER LOG Series Using H-339 for Time Sync: The W ATER LOG Series of data loggers have ® ®
a menu option that allow the user to enable or disable time sync from the H-339. When enabled the
W
ATER LOG data logger will try to sync to the GPS time once a day just after midnight, universal ®
standard time. Time updates will happen as listed in the following table.
CONFIGURATION TIME UPDATE PROCESS
Data Logger Only, No
GOES Radio The data logger time clock is
updated.
Data Logger and SE-100 or
SE-300 Radio The data logger and the GOES
radio time clock are both updated.
Data Logger and SE-1200 The SE-1200 has a built in GPS
system to keep its time accurate,
and the data logger can sync from
this system making the H-339
unneeded for this configuration.
Data logger and Telonics
GOES radio. The data logger time is updated
but the Telonics radio will not
allow its time clock to be changed
once the radio is enabled.
Table # 2
Position Data
The position data is returned in a format of DDMM.mmmm for the latitude and DDDMM.mmmm
for the longitude. This format stands for Degrees, Minutes, Decimal Minutes. For example a value
of 3851.3334 is 38 degrees, 51 minutes, and 3334/10,000 minutes.
To convert this to degrees, minutes, seconds; take the .mmmm portion of the value and multiply by
60. For example, take the value 3851.3334, and multiply 0.3334 by 60 to obtain seconds;
0.3334 * 60 = 20.004 seconds
Now 3851.3334 DDMM.mmmm Equals 38 degrees 51 minutes and 20.004 seconds.