Xylem H-3531 FlashLite - Manual (Page 68)

5-30 SDI-12 Command and Response Protocol
H-3531
5.22 Extended Read/Write NOAA Mode Enable
The H-3531 FlashLite™ can be put into a NOAA Mode. This mode is for applications that
require NOAA. In NOAA mode the data collection platform requests data from the H-3531
FlashLite™ every second for 3 minutes and then is done for 3 minutes. In this mode the
atmospheric pressure and temperature values are updated during the 3 minutes that the data
collection platform is not requesting any data. When NOAA Mode is enabled the H-3531
FlashLite™ measurement response time is less than 1 second. Meaning that the Data command
can be sent within 1 second after the measure command is issued. When the enable value is set to
a ‘1' then the NOAA Mode is enabled and when it is set to a ‘0' then NOAA Mode is disabled.
Command Response Description
“aXRNE!” “a0011” Read NOAA Mode enable
“aXWNEd!” “a0061” Write NOAA Mode enable
Where: a is the sensor address ("0-9", "A-Z", "a-z", "*", "?").
XRNE are upper case characters.
XWNE are upper case characters.
d is the new enable value(0/1)
When the user enables NOAA Mode it takes 6 seconds because it updates the Atmospheric and
Temperature values until the 3 minute no activity gap.
Example of a H-3531 Extended "Read NOAA Mode Enable" command:
Command
Response Time Values Description
"aXRNE!" "a0011" 1 sec 1 Read NOAA Mode Enable
Command Response Description
"aD0!" "a+0" NOAA Mode disabled
Example of a H-3531 Extended "Write NOAA Mode Enable" command:
Command
Response Time Values Description
"aXWNE1!" "a0061" 6 sec 1 Enable NOAA Mode
Command Response Description
"aD0!" "a+1" NOAA Mode enabled
Example of a H-3531 "aM!" command in NOAA Mode:
Command
Response Time Values Description
"aM!" "a0011" 1 sec 1 Measure in NOAA Mode
Command Response Description
"aD0!" "a+AA.AA" Returns Stage