Sutron Corporation 8310 & 7310 Users Manual 8800-1125Rev. 2.7 (BETA) 4/16/2014 pg. 254
the standard GSM 7-bit character set without inserting additional characters. This is undesirable
as it would reduce the number of bytes that can be sent over SMS from 160 to 80 (in the worst
case). To work around this limitation, SMS messages that contain a Pseudobinary message will
automatically be translated to replace non-supported characters with supported characters.
Please note that this requires that the characters be translated back upon reception and before
they can be passed to a decoder.
The following table describes the character translation that’s performed:
SHEF and SHEFFIX Formats
“SHEF” format conforms to NESDIS Standard Decimal format specifications. The format is ASCII
and readable by persons without the aid of a computer.
The standard decimal format is human readable while binary formats require some processing
before the values can be read. The standard decimal format is generally twice as long as the
binary transmission. This means that less data can be sent in the same amount of time using the
standard decimal format.
An example of a standard decimal format message is shown below. This message comes from a
station with three sensors in the self-timed group. The sensors have been named HG, PC and
TA. The battery voltage is the voltage of the battery just prior to transmission.
:HG 0 #15 10.20 10.15 :PC 0 #15 50 49 :TA 0 #15 -22.1 -22.0 :VB 0 12.2
Battery
TemperaturePrecip
Gauge Height
Offset Time
Data Interval
Newest gauge reading
Older gauge reading (by data interval time)
The names HG, PC, TA and VB used in the transmission are called SHEF Physical Element codes
(PE codes) and are the names given to the outputs in the 8310. Be sure to change the output
names if you want specific codes sent in the transmission. NESDIS has a recommended list of
SHEF PE codes on its website at http://noaasis.noaa.gov/DCS/htmfiles/schefcodes.html
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