Campbell Scientific 253-L and 257-L (Watermark 200) Soil Matric Potential Sensors - Manual (Page 29)

253-L and 257-L Soil Matric Potential Sensors
TABLE 7-7. Wiring for Programming Example #3
CR1000 AM16/32 Sensor Wire Function
12V 12V
G GND
C1 RES
C2 CLK
VX1 or EX1 COM ODD H
SE1 (1H) COM ODD L
Ground COM GROUND
SE2 (1L) COM EVEN H
Ground COM EVEN L
1000 ohm
resistor from
SE2 to EX2
1H 107 Black Excitation
1L Red Positive Signal
GROUND Purple Negative Signal
GROUND Clear Shield
2H 253 White Positive Signal
2L Black Negative Signal
GROUND Clear Shield
Continue wiring sensors to multiplexer with 107 probes
attaching to odd numbered channels and 253 sensors to even
numbered channels.
AM16/32 in 4x16 mode.
‘CR1000
Public T107_C(5), WP_kPa(5), kOhms(5)
Dim i
Units T107_C()=Deg C
Units kOhms=kOhms
Units WP_kPa=kPa
DataTable(Hourly,true,-1)
DataInterval(0,60,Min,10)
Average(5, T107_C, FP2, 0)
Sample(5, WP_kPa, FP2)
Sample(5, kOhms, FP2)
EndTable
BeginProg
Scan(60,Sec, 3, 0)
PortSet(1,1) 'Turn AM16/32 Multiplexer On
Delay(0,150,mSec)
i = 1
SubScan (0,uSec,5)
PulsePort(2,10000)
'Soil temperature measurement
Therm107(T107_C(i),1,1,VX1,0,250,1,0)
'253 Soil Moisture Sensor measurements
BrHalf(kOhms(i),1,mV250,2,VX2,1,250,true,0,250,1,0)
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