49
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.
Summary of Contents for CR200
Page 32: ...Section 2 Quickstart Tutorial 22 ...
Page 45: ...Section 3 Overview 35 3 3 Specifications ...
Page 46: ...Section 3 Overview 36 ...
Page 58: ...Section 4 Sensor Support 48 ...
Page 62: ...Section 5 Measurement and Control Peripherals 52 ...
Page 78: ...Section 8 CR200 X Configuration 68 ...
Page 102: ...Section 9 Programming 92 ...
Page 138: ...Section 11 Programming Resource Library 128 ...
Page 156: ...Section 16 Support Software 146 ...
Page 160: ...Section 17 Care and Maintenance 150 ...
Page 167: ...Section 18 Troubleshooting 157 18 3 3 2 Charging Circuit Test Solar Panel ...
Page 168: ...Section 18 Troubleshooting 158 18 3 3 3 Charging Circuit Test Transformer ...
Page 169: ...Section 18 Troubleshooting 159 18 3 3 4 Adjusting Charging Circuit Voltage ...
Page 170: ...Section 18 Troubleshooting 160 ...
Page 184: ...Appendix A Glossary 14 ...
Page 190: ...Appendix B Status Table and Settings 20 ...
Page 192: ...Appendix C Serial Port Pin Outs 22 ...
Page 211: ......