Xylem SDI-12 RADAR - Manual (Page 34)

example of an extended “read Slope” command:
Command response Time Values Description
“aXrS!” “a0011” 1 sec 1 read Slope
Subsequent Command response Description
“aD0!” “a+1.00” Slope is 1.00
SDi-12 CommaND & reSPoNSe
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example of an extended “Write Slope” command:
Command response Time Values Description
“aXwS1.234!” “a0011” 1 sec 1 write Slope
Subsequent Command response Description
“aD0!” “a+1.234” Slope is 1.234
Normally, the radar transmits the service request within 530mS of receipt of the break. as with some
data loggers, this leaves insufficient time to sustain continuous measurements once per second.
The Power_mode is an internal setting which puts the radar in a fast measure mode. in this mode
the radar is always awake and automatically collecting data from the radar unit and storing it at
1-second intervals. in this mode the sensor uses additional power. Changing this mode will allow
and disallow the use of some measurement types.
This command is used to change the power mode. The radar comes from the factory with the power
mode set to the Sleep mode. This setting is stored in non-volatile FLaSH memory within the sensor.
once a new value is written, a copy is sent to the sensor data buffer for verification. This data can
be viewed by using a subsequent “D” command. To read or verify the value any other time, use the
“XrPm” command.
Command response Description
“aXrPm!” “a0011” read Power_Mode
“aXwPmn!” “a0011” write Power_Mode
where:
a is the sensor address (“0-9”, “a-Z”, “a-z”, “*”, “?”).
XrPm are upper case characters.
XwPm are upper case characters.
n is the new setting (0 or 1)
0 = Sleep between measurements
1 = make continuous measurements
extended read Power_Mode and write Power_Mode