Xylem H-424MS V1.1 - Manual (Page 20)

Example of a H-424MS Extended "Write Wakeup Interval" command:
Command Response Time Values Description
------------------- ------------------------ ------ --------- -----------------------------
"aXWI20!" "a0011" 1 sec 1 Write Timer Setting
Command Response Description
------------------- ------------------------ ----------------------------
"aD0!" "a+20." Timer verified at 20.0 seconds
2.9 Write Wake Interval and Write Inactivity Timer Commands
The Wake Interval and Inactivity Timer values control the H-424MS's power save operation.
These values can be written by the SDI-12 host with the following commands. Note only the
settings of the H-424MS which is jumpered for “Master” operation can be accessed.
These commands allows the user to write (change) the timer values. The new value is stored in
non-volatile EEPROM within the H-424MS. Once the new timer 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 observe the timer settings any other time, use the "Read
Wake Interval" or “Read Inactivity Timer” commands.
Command Response Description
------------- ------------------------- -----------------------------
"aXWWddd!" "a0011" Write Wake Interval
"aXWIddd!" "a0011" Write Inactivity Timer
Where:
a is the sensor address ("0-9", "A-Z", "a-z", "*", "?").
XWW are upper case characters.
XWI are upper case characters.
ddd is the new timer value. Valid settings are from 1 to 255 seconds.
The input format is very flexible. Some examples are shown below.
20.0
10
255.0
2-8 SDI-12 Command and Response Protocol
H-424MS