Campbell Scientific CR9000X Measurement and Control System - Manual (Page 240)

Section 7. Measurement Instructions
7-16
Each element in the array corresponds to a line number in the program. To
accommodate all of the instructions in the program, the array must be
dimensioned to a number greater than or equal to the total number of lines in
the program, including blank lines and comments. The Dest array must also be
dimensioned as a long integer (e.g., Public Array(20) AS LONG).
The execution time for an instruction may vary. For instance, it
may take longer to execute instructions when the datalogger is
communicating with another device.
7.5 Peripheral Devices
AM25T (Dest, Reps, Range, AM25TChan, ASlot, DiffChan, TCType, Tref,
ExCardSlot, ClkPort, ResPort, ExChan, RevDiff, SettlingTime, Integ,
Mult, Offset)
This Instruction controls the AM25T Multiplexer.
Parameter
Enter AM25T PARAMETERS
Dest
Var. or Array
The Variable in which to store the results of the instruction. When Reps are used the results are stored in
an array with the variable name. An array must be dimensioned to have elements for all the Reps.
Reps
Constant
The number of repetitions for the measurement. For analog measurements, entering reps as a negative
number forces all reps to be on the same channel except for with CR9058E module.
Note: Enter 0 to only measure the output from the PRT.
Range The voltage range for the measurement. V ranges output volts, mV ranges output millivolts.
Constant ± 5 Volt Analog Input
Module ± 50 Volt Analog Input
Module
Alpha
Code
Num
Code
R *
Option
Code
Voltage
Range
(±mV)
Alpha
Code
Num
Code
R *
Option
Code
Voltage
Range
±
mV5000 0 100 5000 V50 6 N/A 50 V
mV1000 1 101 1000 V10 7 N/A 10 V
mV200 4 104 200 V2 10 N/A 2 V
mV50 5 105 50 mV500 11 N/A 500 mV
mV200C 16 116 200 Alpha Codes ending with a C signify that the channel will be pulled into
See Section
3.2.2 for more
info on the C
& R range
code options.
mV50C 17 117 50 Operational Input Voltage Limits & checked for open input. See Section 3.1.2.
AM25TChan
Constant
The input channel on the AM25T for the first measurement
ASlot
Constant
The number of the slot that contains the CR9050 Module used to measure the AM25T reference
temperature and connected sensors.
DiffChan
Constant
The channel number on the CR9050 Module that will be used to make the actual measurements from the
AM25T.
TCType The code for the thermocouple type.
Constant Alpha Code Numeric Code Thermocouple Type
mV -1 Output mV
TypeT 0 Copper Constantan
TypeE 1 Chromel Constantan
TypeK 2 Chromel Alumel
TypeJ 3 Iron Constantan
TypeB 4 Platinum Rhodium
TypeR 5 Platinum Rhodium
TypeS 6 Platinum Rhodium
NOTE