Xylem H-335 - Manual (Page 27)

H-335
SDI-12 Command and Response Protocol 2-11
Example of a H335 extended "Write Coefficient" command:
Command Response Tim e Values Description
"aXWC1-1!" "a0011" 1 sec 1 Set Coefficient 1 to -1 indicating
the inclinometer rotates
counter-clockwise as the gate
opens.
Subsequent Command Response
"aD0" a-1
2.11 Extended “Write Coefficient” Command
The H-335 processes the sensor measurement data with a set of coefficients. Each coefficient is
programmable, allowing the H-335 to be used on gates with different geometries, and to scale the
height and distance output values to user desired engineering units. This command allows the user
to write (change) any of the coefficient values. The new value is stored in non-volatile EEPROM
within the sensor. Once the new value is written to the EEPROM, a copy is sent to the sensor data
buffer for verification. This data can be viewed by using a subsequent "D" command. To verify any
coefficient any other time, use the "Read Coefficient" command.
Command Response Description
"aXWCnddd!" "a0011"
Write Coefficient n
Where:
a is the sensor address ("0-9", "A-Z", "a-z", "*", "?").
XWC are upper case characters.
n is the coefficient number to program, 1 to 4
ddd is the new coefficient value. The input format is
very flexible. Some examples are shown below.
20.0
0.195
-500
5.93E-4
This command takes 001 seconds to complete and places 1 value in the data buffer. Use the “aD0"
command to collect and view the data.