Campbell Scientific AM16/32B Relay Multiplexer - Manual (Page 28)

AM16/32B Relay Multiplexer
# 3 Clock and Delay — With the CR23X and CR10(X) the clock line is
he pulse port command
s.
hen using a 21X o either an
nnection to an excitation port is preferred because
P22) is required to send the clock
he instruct to provide a 10 ms delay with
5000 mV of excitation. A control port can be used to clock the AM16/32B if
n excitation port is not available. The 21X and CR7 instruction sequence
ired to clock with a control port is: instruction Set Port(s) (P20) (set port
Excitation with Delay (P22) (delay 20 ms without
ed by instruction Set Port(s) (P20) (set port low).
ction
Step Loop Index (P90) is used when a measurement instruction within a loop
is instruction allows 2 – 4 sensors per SET to
ut channels. The instruction sends each
p
put Location is indexed.
ps specified in
ssigned to indexed input
ions ( three.
pass:
cond pas sensor
rd pass: 6 numbers
Removing the program, the following situation
ults:
2 3 4 5 6
pass: 2
cond pas sensor
rd pass: bers
ithout Step Loop Index (P90) the measurement values for the 2nd and 4th
sensors will be overwritten in their input locations. The 1st, 3rd, 5th, and 6th
p
ed.
connected to a control port. Instruction Do (P86) with t
(71– 78) pulses the clock line high for 10 ms. Instruction Excitation with
nal 10 m Delay (P22) can be added following the Do (P86) to delay an additio
W or CR7, the clock line may be connected t
excitation or control port. Co
only one instruction Excitation with Delay (
pulse. T
ion should be configured
a
requ
high), instruction
excitation), follow
# 4 Step Loop Index — With the CR23X, CR10(X), 21X or CR7, instru
has more than one repetition. Th
be measured by 2 – 4 analog inp
measurement value to a sequentially assigned input location without
overwriting any other current iteration value. Without this instruction, the
input location within the loop will advance by only one location per loo
iteration even though the measurement instruction’s In
Example: 2 sensors per SET, 6 sensors total; two re
measurement instruction; two measurement values a
locat
--); P90 step of 2. Loop count of
Input locations
First 1 2 3 4 5 6
1 2
Se
Thi s: 3 4
5
the step loop instruction from
res
Input Locations
First 1
1
Se s: 3 4
Thi 5 6 num
W
measurement values will reside in the first 4 input locations.
Step Loop Index (P90) is available in the CR23X, CR10(X), CR7, and 21X
(with 3
rd PROM). For 21X dataloggers without 3 rd PROM (no instruction Ste
Loop Index (P90)), a separate measurement instruction (with one rep) is
required for each sensor measured within the loop. The input location
parameter within both measurement instructions is index
For example: 2 sensors per SET; one rep in each of two measurement
instructions; two measurement values assigned to indexed input locations (--),
one begins with input location 1, the other with input location 4; no Step Loop
Index (P90). A total of six sensors to be measured; loop count is three.
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