Campbell Scientific AM25T 25-Channel Solid State Multiplexer - Manual (Page 22)

AM25T Solid State Multiplexer
6.2.2 Example CR23X Program
The CR23X uses Instruction 134 for measuring thermocouples or voltages
with the AM25T. Example 5 is a portion of a datalogger program that uses the
instruction to measure 25 type T thermocouples. Instruction 134 automatically
compensates for long lead lengths.
TABLE 6-5. Wiring for CR23X Example
Function AM25T CR23X
+12V Power 12 V 12 V
Power and Shield Ground G
Clock CLK C1
Reset RES C2
RTD Excitation EX E1
Analog Ground AG
Common High HI 1H
Common Low LO 1L
Example 5. CR23X Program for Measuring 25 Type T Thermocouples
;{CR23X}
;
*Table 1 Program
01: 1
Execution Interval (seconds)
01: AM25TMultiplexer (P134)
1: 25
Reps
2: 21 10 mV, 60 Hz Reject, Slow Range
3: 1 AM25T Channel
4: 1 DIFF Channel
5: 21 Exchan 1, 60 Hz Reject
6: 1 Clock Control
7: 2 Reset Control
8: 1 Type T (Copper-Constantan)
9: 1 Ref Temp (Deg. C) Loc [ RefTemp ]
10: 2 Loc [ TC_1 ]
11: 1.0 Mult
12: 0.0 Offset
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