Campbell CR800 Series - FIGURE 23: Pulse Input Wiring Example - Anemometer; Pulse Sensor Wiring; Pulse Input Terminals and Measurements

Section 5. Overview
72
Pulse Input Terminals and Measurements
Pulse Input
Terminal Input Type Data Option
CRBasic
Instruction
P Terminal
• Low-level ac
• High-
frequency
• Switch-closure
• Counts
• Frequency
• Run
average of
frequency
PulseCount()
C Terminal
• Low-level ac
with LLAC4
(p.
562)
module
• High-
frequency
• Switch-closure
• Counts
• Frequency
• Running
average of
frequency
• Interval
• Period
• State
PulseCount()
TimerIO()
5.2.3.3 Pulse Sensor Wiring
Read More See Pulse Measurement Tips (p. 377).
An example of a pulse sensor connection is illustrated in figure Pulse Input
Wiring Example — Anemometer Switch
(p. 72). Pulse sensors have two active
wires, one of which is ground. Connect the ground wire to a (signal ground)
terminal. Connect the other wire to a P terminal. Sometimes the sensor will
require power from the CR800, so there may be two added wires — one of which
will be power ground. Connect power ground to a G terminal. Do not confuse
the pulse wire with the positive power wire, or damage to the sensor or CR800
may result. Some switch closure sensors may require a pull-up resistor.
FIGURE 23: Pulse Input Wiring
Example — Anemometer