Campbell Scientific AM16/32B Relay Multiplexer - Manual (Page 27)

AM16/32B Relay Multiplexer
I=I+1
'The Resistance measurement measures the PRT resistance:
Resistance (PRTResist(I),1,mV50,7,Ix1,1,500,True ,True ,0,250,0.01,0)
'With a multiplier of 0.01 (1/100) the value returned is R/Ro (Resist/Resist @ 0 deg)
'the required input for the PRT temperature calculation instruction.
NextSubScan
Portset (1 ,0)
'Set C1 Low to disable Multiplexer
'Calculate the Temperature from R/Ro:
PRT (PRTTemp(1),16,PRTResist(1),1.0,0)
CallTable Avg15Min
'Call the DataTable
NextScan
EndProg
5.2 og Programming
Edlog is used to program our CR10(X), 21X, CR23X, and CR7.
5.2.1 Single Loop
generalized structure of a program loop is as follows:
TABL I e
Edl
Instruction Sequence
When a number of similar sensors are multiplexed and measured, the
Instructions to clock the AM16/32B and to measure the sensors are placed
within a program loop. For the CR23X, CR10(X), 21X, and CR7, the
E 5-1. Single Loop nstruction Sequenc
# IN CTION FUN STRU CTION
1 Set port high to activat e AM16/32B
2 Begin loop
3 /32B & delay Clock AM16
4 Step loop index
(required in some configurations)
5 Measure sensor
6 Additional processing
7 End loop
8 Additional program loops
9 Set port low to deactivate AM16/32B
#1, #9 Activate/Deactivate the AM16/32B — The control port connected to
reset (RES) is set high to activate the AM16/32B prior to the advance and
measure sequence and set low following the measurement loop(s). For the
CR10X, CR23X, and CR10, 21X, CR7 dataloggers with OS series PROMs,
ction Do (P86) to set and reset the port (for CR10, 21X, and CR7
).
#2, #7 Begin and End a Loop — For the CR23X, CR10(X), 21X, and CR7
of Loop (P87), and by
f Loop (P87), the 2nd
n count) defines the number of times the instructions within
loop are executed before the program exits the loop.
use instru
with earlier PROMs, use instruction Set Port(s) (P20)
dataloggers, a loop is defined by instruction Beginning
uction End (P95). Within instruction Beginning o instr
parameter (iteratio
the
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