CR300-Series Datalogger
34
Pulse input terminals and the input types they can measure are shown in
TABLE 6-3. Pulse Measurement Input Types, Terminals,
and Data Options
Input Type
Pulse Input Terminal
Data Option
High-frequency
SE 1-4
C1-C2
P_SW
P_LL
Counts
Frequency
Running average of
frequency
Low-level AC
P_LL
Switch-closure
P_SW
C1-C2
6.3 Period Averaging – Details
SE
terminals
1-4
on the CR300 are also configurable for measuring the period
of a digital signal. The specified number of cycles is timed with a resolution of
13 ns, making the resolution of the period measurement 13 ns divided by the
number of cycles chosen. The signal transition threshold is 2.5 V.
Period-average measurements use a high-frequency digital clock to measure
time differences between signal transitions, whereas pulse-count measurements
simply accumulate the number of counts. As a result, period-average
measurements offer much better frequency resolution per measurement
interval, as compared to pulse-count measurements.
Maximum frequency: 200 kHz
Resolution: 13 ns ÷ number of cycles to be measured
6.4 Digital Input/Ouput – Details
Terminals
C1
,
C2
,
P_SW
, and
SE 1-4
can be configured for digital input or
output. As input terminals, they can measure the state, low (0 V) or high
(threshold 3.3 V), of an input. As output terminals, they can be set low (0 V) or
high (
SE 1-4
and
P_SW
to 3.3 V, and
C1-C2
to 5 V). With limited drive
capacity, digital output terminals are normally used to operate external relay-
driver circuits. Drive current and high-state voltage levels vary between
terminals. See TABLE
(p. 47)
Pulse-width modulation can be done on terminals
SE1
–
SE4
. See the
PWM()
instruction in
CRBasic Editor Help
for more information.
6.5 Communication – Details
6.5.1 Communication Ports
The CR300 is equipped with hardware ports that allow communication with
other devices and networks, such as:
•
PC
•
Smart sensors
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