Xylem System 5000 User Manual - Manual (Page 60)

OUTPUTS
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Selected Format
Displays the format based on the selections of the above two options.
SHEF Code
Displays the SHEF code used for this
particular Task. Two character codes
are expected but not enforced. The
Use Task Name button simply places
the Task Name into the SHEF Code
field.
The Edit Binary Task Format screen
allows the number of bytes,
precision, sign mode, and function
to be chosen for the selected Task.
Bytes
Each data value is converted into a
Pseudo Binary format consisting of 1 to 4 bytes. Using more bytes allows a wider range and
precision, at the expense of using more space within the transmission window. Each byte in this
format uses 6 bits for data, one bit is always set to a 1, and one bit for parity. A single byte with
6 bits used for data gives a range of 0 to 63; a 4 byte value can have a range of 0 to 16777215.
Fine-tuning of a transmission can be found by properly assigning each Task only the number of
needed bytes. This will, of course, make the decoding process a bit more difficult as well.
Precision
Defines the number of digits to the right of the decimal point that should be preserved. For
example, a water level value in meters will still require millimeter resolution. Setting the precision
to 3 would allow this. On the other hand, if a Task measuring wind direction returns only whole
numbers, the number of digits needed would be zero.
Selected Range
Displays the available range of values given the selected Bytes and Precision.
Sign Mode
This option indicates if the values will be only positive values or if they may include negative
numbers. Signed numbers can be in two’s complement or signed magnitude format.