Xylem H-3531 FlashLite - Manual (Page 56)

5-18 SDI-12 Command and Response Protocol
H-3531
5.17 Extended Read Power_Mode and Write Power_Mode
The Quad, 0-5V output, and 4-20mA output are updated whenever a measurement is made. For
industrial applications such as 4-20mA where the H-3531 FlashLite™ is connected to a SCADA
or PLC system and low-power is not of concern, the H-3531 FlashLite™ can be programmed to
make continuous measurements. This command is used to change the power mode. The H-3531
FlashLite™ comes from the factory with the power mode set to the Sleep mode. 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 "aD0" 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, 3 or 4):
0 = Sleep between measurements
1 = Sleep with sensor bias On (reserved for factory use)
2 = Sleep with sensor bias and reference On (reserved for factory use)
3 = Make measurements and update all outputs based on measure rate
4 = Power profile for Modbus
This command takes 001 seconds to complete and places 1 value in the data buffer. Use the
“aD0" command to collect and view the current value.
Example of a H-3531 Extended "Read Power_Mode" command:
Command
Response Time Values Description
"aXRPM!" "a0011" 1 sec 1 Read Power_Mode
Command Response Description
"aD0!" "a+0" Mode = Sleep
Example of a H-3531 Extended "Write Power_Mode" command:
Command
Response Time Values Description
"aXWPM3!" "a0011" 1 sec 1 Write Power_Mode
Command Response Description
"aD0!" "a+3" Mode 3 = Continuous mode