Campbell Scientific CS700 Tipping Bucket Rain Gage and CS700H Heated Rain Gage - Manual (Page 33)

Appendix A. CS700H Operation
TABLE A-3. Snow Sensor Power Options
Mode (X20
command) Snow Enabled
X22 command
Description
0 Snow sensor doesn’t have power
applied. Cannot detect real snow;
however it indicates snow is always
present. Auto
1 Snow sensor only has power applied
when the Ambient temperature is below
the Active On temperature. Can only
detect snow when temperature is in this
range.
0 Snow sensor doesn’t have power
applied. Cannot detect real snow,
however it indicates snow is always
present. Manual
1 Snow sensor always has power applied,
and can detect snow at any time.
A.5 SDI-12 Interface
You may use the SDI-12 capabilities to communicate with the microprocessor
in the rain gage. This mode is enacted on each command by proceeding each
SDI-12 command with an ascii ‘*’ rather than a “break’. When the ascii ‘*’ is
detected, all of the timing/break requirements of the SDI-12 are removed.
Commands may be entered in a datalogger program or from a terminal
program such as “Hyperterminal”.
You must use 1200 baud, 7 bits, even parity and no
handshaking. The “a” is the sensor address in the displayed
commands. By default, the CS700H is set to address “0”. NOTE
A-5