Specifications

Appendix B. Entering SDI-12 Commands/Changing Settings
• 0 (OFF—this mode is typically not recommended; sensor is completely off
until a new set power command is received)
The OFF power mode should only be used by advanced users
who want to turn the sensor off for extended time periods. In this
mode the sensor is completely off and only responds to a new set
power command.
CAUTION
The factory default Power Operation Mode is 1 (ON). In this mode of
operation, the instrument is continuously making measurements and draws
approximately 13.5 mA. The AUTO Power Operation Mode puts the
instrument in quiescent mode between measurement request queries.
Change this setting by first using the aXSPOM+n! command (where n=1 (on),
2 (auto), or 0 (off)) followed by the aXGPOM! (Get Power Mode) command.
Table B-6 shows an example of the command and response for changing this
setting.
TABLE B-6. Example for Setting Power Operation Mode
Initial Command Response
0XSPOM+2!
Where,
0—sensor’s address;
2—the new power mode setting
(2=auto).
00011<cr><If>
Where (from left to right),
0—sensor’s address;
001—the amount of time (in seconds)
that you must wait before sending
another data command;
1—the number of values that will be
placed in the buffer.
Subsequent Command Response
aXGPOM!
Where zero is the sensor address.
This is the get power mode
command.
0+2<cr><If>
Where,
0—sensor’s address;
2—the new power mode setting
(2=auto).
B-5