Xylem H-424MS V1.0 - Manual (Page 24)

2-8 SDI-12 Command and Response Protocol
H-424MS
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