User Manual

Appendix B. SDI-12 Commands/Changing Settings
The factory default water conditions are set to 1, which is smooth. The water
condition settings should closely mimic the actual water conditions during
normal river flow.
Change this setting by first using the aXSWC+n! command (where n=0
(custom), 1 (smooth), 2 (medium), or 3 (rough)) followed by the aXGWC!
(Get Water Conditions) command. TABLE B-5 shows an example of the
command and response for changing this setting.
TABLE B-5. Example for Setting Water Conditions
Initial Command Response
0XSWC+2!
Where,
0—sensor’s address;
2—the new water condition setting
(2 = medium).
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 command;
1—the number of values that will be
placed in the buffer.
Subsequent Command Response
0XGWC!
Where zero is the sensor address.
This is the send water conditions
command.
0+2<cr><If>
Where,
0—sensor’s address;
2—the new water condition setting
(2 = medium).
B.1.6 Set Power Operation Mode
The following three power operation modes are available:
• 1 (ON—sensor is always on until a new set power command is received.)
• 2 (AUTO—sensor is powered by an incoming request from the SDI-12
bus and sends back a response including the information on power up
time.)
• 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.
B-5