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Section 5. Measurement and Control
Peripherals
Peripheral devices expand the CR200(X) input / output capacity. Classes of
peripherals are discussed below according to use.
Read More!
For complete information on available measurement and control
peripherals, go to
APPENDIX. Sensors and Peripherals
(Appendix p. 29),
www.campbellsci.com
, or contact a Campbell Scientific applications engineer.
5.1 Control Output
Controlling power to an external device is a common function of the CR200(X).
On-board control terminals are available for binary (on / off) control.
Many devices are conveniently controlled with the SW Battery (Switched 12
Volt) terminal on the CR200(X). Applications requiring more control channels
or greater power sourcing capacity may be satisfied by using control ports C1 –
C2 in conjunction with single-channel switching relays.
5.1.1
Binary Control
5.1.1.1
Digital I/O Ports
Each of 2 digital I/O ports (C1 - C2) can be configured as an output port and set
low (0 V) or high (5 V) using the PortSet () or WriteIO () instructions. A digital
I/O port is normally used to operate an external relay driver circuit because the
port itself has limited drive capacity. Drive capacity is determined by the 5V
supply and a 330 ohm output resistance. It is expressed as:
Vo = 4.9V - (330 ohms) * Io
Where Vo is the drive limit, and Io is the current required by the external
device.
FIGURE. Control Port Current Sourcing
(p. 50) plots the relationship.
Содержание CR200
Страница 32: ...Section 2 Quickstart Tutorial 22 ...
Страница 45: ...Section 3 Overview 35 3 3 Specifications ...
Страница 46: ...Section 3 Overview 36 ...
Страница 58: ...Section 4 Sensor Support 48 ...
Страница 62: ...Section 5 Measurement and Control Peripherals 52 ...
Страница 78: ...Section 8 CR200 X Configuration 68 ...
Страница 102: ...Section 9 Programming 92 ...
Страница 138: ...Section 11 Programming Resource Library 128 ...
Страница 156: ...Section 16 Support Software 146 ...
Страница 160: ...Section 17 Care and Maintenance 150 ...
Страница 166: ...Section 18 Troubleshooting 156 18 3 3 Diagnosis and Fix Procedures 18 3 3 1 Battery Voltage Test ...
Страница 167: ...Section 18 Troubleshooting 157 18 3 3 2 Charging Circuit Test Solar Panel ...
Страница 168: ...Section 18 Troubleshooting 158 18 3 3 3 Charging Circuit Test Transformer ...
Страница 169: ...Section 18 Troubleshooting 159 18 3 3 4 Adjusting Charging Circuit Voltage ...
Страница 170: ...Section 18 Troubleshooting 160 ...
Страница 184: ...Appendix A Glossary 14 ...
Страница 190: ...Appendix B Status Table and Settings 20 ...
Страница 192: ...Appendix C Serial Port Pin Outs 22 ...
Страница 211: ......