Campbell Scientific AM416 Multiplexer User Manual
Page 23
AM416 RELAY MULTIPLEXER
17
EXAMPLE PROGRAM - THERMOCOUPLE
AND SOIL BLOCK MEASUREMENT
(PROGRAM IS FOR CR10(X) - 33
LOCATIONS ALLOCATED TO INPUT
STORAGE)
*
1
Table 1 Programs
01:
60
Sec. Execution Interval
REFERENCE TEMPERATURE FOR
THERMOCOUPLES
01:
P11
Temp 107 Probe
01:
1
Rep
02:
4
IN Chan
03:
1
Excite all reps w/EXchan 1
04:
1
Loc [:REFTEMP ]
05:
1
Mult
06:
0
Offset
ENABLES MULTIPLEXER
02:
P86
Do
01:
41
Set high Port 1
BEGINS MEASUREMENT LOOP
03:
P87
Beginning of Loop
01:
0
Delay
02:
16
Loop Count
CLOCK PULSE
04:
P86
Do
01:
72
Pulse Port 2
05:
P22
Excitation with Delay
01:
1
EX Chan
02:
2
Delay w/EX (units=.01 sec)
03:
0
Delay after EX (units=.01 sec)
04:
1
mV Excitation
05:
0
MEASURES 1 THERMOCOUPLE PER LOOP
06:
P14
Thermocouple Temp
(DIFF)
01:
1
Rep
02:
1
2.5 mV slow Range
03:
1
IN Chan
04:
1
Type T (Copper-Constantan)
05:
1
Ref Temp Loc REFTEMP
06:
2--
Loc [:TC #1 ]
07:
1
Mult
08:
0
Offset
MEASURES 1 SOIL MOISTURE BLOCK PER
LOOP
07:
P5
AC Half Bridge
01:
1
Rep
02:
14
250 mV fast Range
03:
3
IN Chan
04:
2
Excite all reps w/EXchan 2
05:
250
mV Excitation
06:
18--
Loc [:SOIL M #1]
07:
1
Mult
08:
0
Offset
ENDS MEASUREMENT LOOP
08:
P95
End
DISABLES MULTIPLEXER
09:
P86
Do
01:
51
Set low Port 1
CALCULATES BRIDGE TRANSFORM ON
SOIL MOISTURE BLOCKS
10:
P59
BR Transform Rf[X/(1-X)]
01:
16
Reps
02:
18
Loc [:SOIL M #1]
03:
1
Multiplier (Rf)
11:
P
End Table 1
INPUT LOCATION LABELS:
1:REFTEMP
19:SOIL M #2
2:TC #1
20:SOIL M #3
3:TC #2
21:SOIL M #4
4:TC #3
22:SOIL M #5
5:TC #4
23:SOIL M #6
6:TC #5
24:SOIL M #7
7:TC #6
25:SOIL M #8
8:TC #7
26:SOIL M #9
9:TC #8
27:SOIL M#10
10:TC #9
28:SOIL M#11
11:TC #10
29:SOIL M#12
12:TC #11
30:SOIL M#13
13:TC #12
31:SOIL M#14
14:TC #13
32:SOIL M#15
15:TC #14
33:SOIL M#16
16:TC #15
34:_________
17:TC #16
35:_________
18:SOIL M #1
36:_________