OTT HydroMet SUTRON XLINK 100, Руководство по эксплуатации и техническому обслуживанию

Страница: 178 / 248

Page 178 of 248
[ 5B 1
16.6 SHEF and SHEFFIX Data Format
SHEF is a format that is commonly used by Sutron's satellite transmitters. It is an ASCII format that is easy
to read and contains some self-descriptive information.
The format of the transmission data is:
: <LABEL1> <OFFSET> #<INTERVAL> <DATA1> <DATA1> ... <DATA1)>
: <LABEL2> <OFFSET> #<INTERVAL> <DATA2> <DATA2> ... <DATA2> ...
: <LABEL(N)> <OFFSET> #<INTERVAL> <DATA(N)> <DATA(N)> ... <DATA(N)>
LABEL This is the Label entered as a part of the setup for each
measurement. The label can be a SHEF two-character parameter
code such as HF for gauge height or PC for cumulative precipitation,
or it can be any string you enter. Refer to
http://noaasis.noaa.gov/DCS/htmfiles/schefcodes.html for a list of
SHEF codes commonly used.
OFFSET This number indicates how long ago the sensor reading was made.
The number is in minutes, and it refers to the most recent data. It is
relative to transmission start.
INTERVAL The interval indicates how often the measurement was made. It
corresponds to the setting
Meas Interval.
DATA This is data collected and logged by the station through
measurements. Only logged data may be transmitted. If
Tx Data
Content is set to Exclude, no data from that measurement will be
transmitted.
Like the binary formats, the SHEF format groups all the related data
from one measurement. The data is transmitted in ASCII with sign
and decimal point (if needed). If a data value has not yet been
recorded (or has been erased) the letter M for missing data will be
sent. The most recent data is always sent first. The number of values
sent for each measurement is set on a measurement by
measurement basis.
APPEND
OPTIONS There are a multitude of optional values that may tacked on at the
end of the transmission. Please see
A
PPEND
O
PTIONS
.
16.6.1 SHEF Example
Here is a message with three active measurements. Each is set to include two readings. The random buffer
contains the string EXT. This string was given by an external device through the RS-232 port. Notice how
much longer this message is compared to the earlier binary examples.