Campbell Scientific AM25T 25-Channel Solid State Multiplexer - Manual (Page 16)

AM25T Solid State Multiplexer
‘Main Program
BeginProg
Scan
(1,Sec,0,0)
AM25T (TC(),25,mV2_5C,1,1,TypeT,Tref,5,4,Vx1,True,0,250,1.0,0)
CallTable Dat15sec
CallTable Dat5min
NextScan
EndProg
6.1.1.2 CR1000 Example Program 2
In this example, one AM25T instruction is used to measure the on-board PRT,
and another AM25T instruction is used to measure ten type T thermocouples.
Table 6-2 provides the wiring for the example.
TABLE 6-2. Wiring for CR1000 Example 2
Function AM25T CR1000
+12 Power 12 V 12 V
Power and Shield Ground Gnd Gnd
Clock CLK 2
Reset RES 1
RTD Excitation EX EX1
Common High HI 1H
Common Low LO 1L
Example 2. CR1000 Program that Uses Separate AM25T Instructions to Measure the PRT
and Thermocouples
'Declare Variables and Units
Public Batt_Volt
Public RTemp_C
Public Temp_C(10)
Units Batt_Volt=Volts
Units RTemp_C=Deg C
Units Temp_C=Deg C
'Define Data Tables
DataTable(Table1,True,-1)
DataInterval(0,60,Min,0)
Sample(10,Temp_C(),FP2)
EndTable
'Main Program
BeginProg
Scan(30,Sec,1,0)
'Default Datalogger Battery Voltage measurement Batt_Volt:
Battery(Batt_Volt)
12