Section 4. Sensor Support
44
FIGURE. Pulse Input Types
(p. 7) illustrates pulse input types measured by the
CR200(X). Dedicated pulse input channel P_SW can be configured to read
high- frequency pulses or switch closure, while P_LL can be configured to read
a low-level AC signal. With a 100 kOhm pull-up resistor added to the wiring
panel P_LL, C1, or C2 can measure pulse input signals (See
Pulse Input (P_SW
p. 44).
Figure 30: Pulse Input Types
4.4.1.1
Pulse Input (P_SW)
Internal hardware routes high-frequency pulse to an inverting CMOS input
buffer with input hysteresis. The CMOS input buffer is guaranteed to be an
output zero level with its input
≥
2.7 V, and guaranteed to be an output one with
its input
≤
0.9 V. An RC input filter with approximately a 1 µs time constant
precedes the inverting CMOS input buffer, resulting in an amplitude reduction
of high frequency signals between the P_SW terminal block and the inverting
CMOS input buffer as illustrated in FIGURE. Amplitude reduction of pulse-
count waveform. For a 0 to 5 Volt square wave applied to P_SW, the maximum
frequency that can be counted in pulse input mode is approximately 1 kHz.
Figure 31: Amplitude Reduction of Pulse-Count Waveform (before and
after 1 ms time constant filter)
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: ......