Campbell Scientific CS700 Tipping Bucket Rain Gage and CS700H Heated Rain Gage - Manual (Page 38)

Appendix A. CS700H Operation
A.5.2 Operating Modes
The CS700H can be put into Automatic or Manual Operation Modes. Table
A-6 describes how the modes are entered and the operation of the modes.
TABLE A-6. Operating Modes
Auto/
Manual
X20 Cycle
Enable
X29 Heater
On/Off
X21 Snow
Enabled
X22
Snow
Description
0 X X 1 0 / 1 Auto Mode :
When the Ambient temperature falls below the
Active On temperature X23, and Snow is
detected, then a Heating Cycle is started. (That
is, the heater elements are switched on and off to
keep inside the funnel at the SetPoint
temperature X26.) This is a low power mode, as
the heater cycle only begins when snow is
detected !
0 X X 0 1 Auto Mode :
Same as above, but because the snow sensor is
disabled the snow detected flag is always set.
The Heating Cycle is started when the Ambient
temperature fall below the Active On
temperature X23. This mode uses more power
and should only be used when the system is
supplied by mains power.
1 0 / 1 0 X X Manual Mode :
The Cycle Enable flag X29 is used to force a
Heating Cycle. This is set or cleared by another
system at the site – as it determines whether
heating is required. When the Cycle Enable flag
is “0” the heaters are off. When the Cycle
Enable flag is “1” then the Heating Cycle is
started. (That is, the heater elements are
switched on and off to keep inside the funnel at
the SetPoint temperature X26.) The snow
sensor state can be read using the measure/data
commands, but its state is ignored when
controlling the heaters.
1 0 0 / 1 X X Manual Mode :
The heater elements can be controlled directly
with the Heater On/Off flag X21. When the
flag is “0” the heaters are off, and when the flag
is “1” the heaters are on. Note that the heaters
must be cycled by the controlling system in
order to control the funnel temperature. This
mode must be used with caution !
(X = Don’t Care)
A-10