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Campbell Manufacturing R410, RF400, RF415 L-9, EXAMPLE #7, It ≈ 0.43 mA

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Appendix L. RF400/RF410 Average Current Drain Calculations

EXAMPLE #7 (Remote RF400/RF410 in “<0.4 mA, 4 sec Cycle” standby mode )

The RF400/RF410s in this example are configured for the lowest possible average standby mode current (Advanced Setup Menu selection 7). The same amount of data are collected as in Example 1, however the frequency of collection is extended to once an hour.

It = Is + Id + Ir + Ii

Calculating each term:

Is = table mA value = 0.4 mA

Id =		[45 (ms) + 2 N (ms)]		⋅ 73 mA =	65 ms	⋅ 73 mA = 0.001mA
					3,600,000 ms
		T (ms)
Ir =		20 (ms)	⋅ 24 mA = 0.0001 mA
	3,600,000 (ms)
Ii =		5000 ms	⋅ 24 mA = 0.033 mA
	3,600,000 (ms)

It ≈ 0.43 mA

SUMMARY

Choosing a lower current standby mode does not always result in an overall lower average current for the base RF400/RF410 because, by selecting a lower current standby mode, the base RF400/RF410 must generate a longer “long header” which involves more transmit time at 73 mA. However, the remote site will normally benefit from a lower standby mode current since it does not usually transmit a “long header.”

If the remote station is doing call-backs, then the remote RF400/RF410 must initiate the connection by sending a “long header” so the remote RF400/RF410’s average current drain may be higher than that of the base RF400/RF410. Data collection may be a mixture of scheduled calls and call- backs (possibly event driven).

As collection intervals become longer, the effects of “time of inactivity to sleep” and data amount lessen and the average current drain approaches the stated standby mode current.

L-9

Contents

RF400/RF410/RF415 Spread Spectrum Data Radio/Modem Warranty and Assistance – CAUTION – Page RF400 Series Table of Contents Introduction Quick Start Software Setup Troubleshooting D. Advanced Setup Standby Modes E. RF400 Series Port Pin Descriptions Short-Haul Modems H. Distance vs. Antenna Gain, Terrain, and Page Page RF400 Series Spread Spectrum Data Radio/Modems 1. Introduction 2. RF400 Series Specifications 3. Quick Start Step 1 – Set Up Base RF400 Step 2 – Set Up Remote RF400 Step 3 – LoggerNet/PC208W Set-up Step 4 – Connect 4. System Components 4.1 RF400 Series Data Radios 4.1.1 Indicator LEDs 4.1.2 Setup Menu 4.1.3 Networking 4.1.4Error Handling and Retries 4.1.4.2 Number of Retries 4.1.4.3 Number of Time Slots for Random Retry 4.1.4.4 Number of Bytes Transmitted before Delay 4.1.4.5 Sync Timer Setting 4.1.5 Received Signal Strength 4.2Power Supplies The RF400 series radio will sustain damage if the DC Pwr jack voltage ever exceeds Volts 4.3 Serial Cables 4.4 Antennas for the RF400 Series FCC OET Bulletin No. 63 (October 1993) approved antennas Page Page 4.5 Antenna Cables and Surge Protection 4.5.1 Antenna Cables 4.5.2 Electro-staticIssues 4.5.3Antenna Surge Protector Kit 5.Software Setup 5.1Point-to-point 5.2 Point-to-multipoint 5.3 Example Setups 5.3.1Direct PC to RF400 Series Base Station Setup Page 5.3.2Remote Station Setup Page 5.3.3 LoggerNet Configuration 5.3.4PC208W Configuration Page 6. Troubleshooting Page Page Appendix A. Part 15 FCC Compliance Warning Page Appendix B. Setup Menu B-2 B-3 B-4 Appendix C. RF400 Series Address and Address Mask Combined Network/ Radio Addresses C-2 C-3 C-4 Appendix D. Advanced Setup Standby Modes D-2 Appendix E. RF400 Series Port Pin Descriptions CS I/O FUNCTION E-2 Appendix F. Datalogger RS-232Port to RF400 Series Radio Page Appendix G. Short-HaulModems G-2 Appendix H. Distance vs. Antenna Gain, Terrain, and Other Factors Overview Link Analysis Transmitter Power Cable Loss Antenna Gain Receiver Sensitivity Path Loss Real World Distance Estimates Examples Range from ~9 to ~22 miles Range from ~14 to 30+ H-8 Appendix I. Phone to RF400 Series Page 2)AT Command Character: “-” Page Appendix J. Monitor CSAT3 via RF400 Series J-2 J-3 Page Appendix K. RF400/RF410 Pass/Fail Tests TESTING SC12 CABLE and PC COM PORT K-2 TESTING RF400/RF410s TESTING ANTENNAS K-5 TABLE K-1.900 MHz Gain Antenna Test Distances Antenna Power Ratio Distance Apart Over ¼ Wave Appendix L. RF400/RF410 Average Current Drain Calculations L-2 EXAMPLE #1 It ≈ 6.1 mA L-3 EXAMPLE #2 It ≈ 6.9 mA L-4 EXAMPLE #3 It ≈ 12.4 mA L-5 EXAMPLE #4 It ≈ 2.4 mA L-6 EXAMPLE #5 It ≈ 4.1 mA L-7 EXAMPLE #6 It ≈ 0.6 mA L-8 EXAMPLE #7 It ≈ 0.43 mA L-9 L-10 Page Campbell Scientific Companies Campbell Scientific, Inc. (CSI) Campbell Scientific Africa Pty. Ltd. (CSAf) Campbell Scientific Australia Pty. Ltd. (CSA) Campbell Scientific do Brazil Ltda. (CSB)