Specifications

5-1
Section 5. Measurement and Control
Peripherals
Peripheral devices are available for expanding the CR1000’s on-board input /
output capabilities. Classes of peripherals are discussed below according to
use. Some peripherals are designed as SDM (Synchronous Devices for
Measurement) devices. SDM devices are intelligent peripherals that receive
instruction from and send data to the CR1000 over a proprietary 3-wire serial
communications link utilizing channels C1, C2, and C3.
Read more! For complete information on available measurement and
control peripherals, go to www.campbellsci.com, or contact a Campbell
Scientific applications engineer.
5.1 Analog Input Expansion
Mechanical relay and solid state relay multiplexers are available to expand the
number of analog sensor inputs. Multiplexers are designed for single-ended,
differential, bridge resistance, or thermocouple inputs.
5.2 Pulse Input Expansion Modules
Pulse input expansion modules are available for switch closure, state, pulse
count and frequency measurements, and interval timing.
5.3 Serial Input Expansion Modules
Capturing input from intelligent serial output devices can be challenging.
Several Campbell Scientific serial I/O modules are designed to facilitate
reading and parsing serial data. Campbell Scientific recommends consulting
with an applications engineer when deciding which serial input module is
suited to a particular application.
5.4 Control Output
Controlling power to an external device is a common function of the CR1000.
Devices are available for binary (on / off) or analog (variable) control.
Many devices can conveniently be controlled with the SW-12 (Switched 12
Volt) terminal on the CR1000. Applications requiring more control channels
or greater power sourcing capacity can usually be satisfied by using one of
Campbell Scientific’s multiple-channel control modules or by using control
ports (C1 - C8) in conjunction with single-channel switching relays.