Xylem H-3531 FlashLite - Manual (Page 67)

H-3531
SDI-12 Command and Response Protocol 5-29
5.21 Extended Read/Write Fast Mode Enable
The H-3531 FlashLite™ can be put into a Fast Mode. In this mode the atmospheric pressure and
temperature values are updated about every 3 minutes. When Fast Mode is enabled the H-3531
FlashLite™ measurement response time is 1 second. In Fast Mode the Meancount/Averaged
measurements value is not used. When the enable value is set to a ‘1' then the Fast Mode is
enabled and when it is set to a ‘0' then Fast Mode is disabled.
Command Response Description
“aXRFE!” “a0011” Read Fast Mode enable
“aXWFEd!” “a0061” Write Fast Mode enable
Where: a is the sensor address ("0-9", "A-Z", "a-z", "*", "?").
XRFE are upper case characters.
XWFE are upper case characters.
d is the new enable value(0/1)
When the user enables Fast Mode it takes 6 seconds because it updates the Atmospheric and
Temperature values until the next 3 minute update.
Example of a H-3531 Extended "Read Fast Mode Enable" command:
Command
Response Time Values Description
"aXRFE!" "a0011" 1 sec 1 Read Fast Mode Enable
Command Response Description
"aD0!" "a+0" Fast Mode disabled
Example of a H-3531 Extended "Write Fast Mode Enable" command:
Command
Response Time Values Description
"aXWFE1!" "a0061" 6 sec 1 Enable Fast Mode
Command Response Description
"aD0!" "a+1" Fast Mode enabled
Example of a H-3531 "aM!" command in Fast Mode:
Command
Response Time Values Description
"aM!" "a0014" 1 sec 4 Measure sensor in Fast Mode
Command Response
"aD0!" “a+AA.AA+BB.BBBB+CC.C+DD.D”
See Measure command for Data response details