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Campbell Scientific CWS220 Wireless Sensor Network (CWB100, CWS220, and CWS900 - Page 16

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Wireless Sensor Network 2. Specifications 2.1 Wireless Sensor Network Radio The CWB100 and CWS sensors use a 25 mW FHSS radio. Three models are available depending on location of usage. Table 2.1-1 shows model numbers and locations used for all models. 2.1.1 Electrical TABLE 2.1-1. CWS FHSS Radio Specifications Model Where Used Frequency FHSS Channels CWSxxx, CWB100 CWSxxxA, CWB100A U.S. Canada, 902-928 MHz 50 Australia, and New Zealand CWSxxxE, CWB100E Europe Transmitter Power Output: 868 MHz 16 25 mW (+14 dBm) Receiver Sensitivity: -110 dBm (0.1% Frame Error rate) Current Drain Standby: Receiving: Transmitting: 3 μA 18 mA typical (full run) 45 mA Average operating current w/1 second access time: 15 μA Operating Temperature Range: -25° to +50°C (-13° F to + 122°F) Additional Features GFSK modulation Data interleaving Forward Error Correction BCH (31,21) Data scrambling Quality of Service management RSSI 8

Section	Page
Revision and Copyright Information	1
Warranty	3
Assistance	4
Table of Contents	5
Wireless Sensor Network	9
1. Understanding a Wireless Sensor Network	9
1.1 General Description	9
1.2 CWB100 Wireless Base Station	10
1.3 CWS220 Wireless Infrared Radiometer	11
1.4 CWS655 Wireless Water Content Reflectometer	12
1.5 CWS900 Wireless Sensor Interface	13
2. Specifications	16
2.1 Wireless Sensor Network Radio	16
2.1.1 Electrical	16
2.1.2 Typical RF Range	17
2.1.3 RSSI	17
2.1.4 Service Discovery Protocol	17
2.1.5 Antenna Options	18
2.2 CWB100 Specifications	18
2.2.1 CWB100 Physical Specifications	18
2.2.2 CWB100 Electrical Specifications	18
2.2.3 CWB100 Environmental Specifications	19
2.2.4 Datalogger Compatibility	19
2.3 CWS220 Specifications	19
2.3.1 CWS220 Physical Specifications	19
2.3.2 CWS220 Electrical Specifications	20
2.3.3 CWS220 Environmental Specifications	20
2.4 CWS655 Specifications	20
2.4.1 CWS655 Physical Specifications	20
2.4.2 CWS655 Electrical Specifications	20
2.4.3 CWS655 Environmental Specifications	21
2.5 CWS900 Specifications	21
2.5.1 CWS900 Physical Specifications	21
2.5.2 CWS900 Electrical Specifications	21
2.5.3 CWS900 Environmental Specifications	22
3. Getting Started: Creating a Wireless Sensor Network	22
3.1 Hardware and Software Required for a WSN	22
3.1.1 A205 CWS to PC Interface	22
3.1.2 Required Cables	23
3.1.3 Configuration CD	24
3.1.4 Configuration Software	24
3.1.5 Driver Installation	24
3.2 Creating a Model of the WSN	24
3.2.1 Wireless Sensor Planner and Network Planner	24
3.2.2 Installing Wireless Sensor Planner	25
3.2.3 Using Wireless Sensor Planner	25
3.2.3.1 Simple WSN Example	26
Placing Devices on the Drawing Canvas	26
Adding Communication Links to Devices	27
3.3 Configuring the Devices in the WSN	29
3.3.1 Configuring the CWB100	29
3.3.2 Configuring the CWS655	31
3.3.3 Configuring the CWS900	32
3.4 Sending the Sensor Configuration File to the Datalogger	32
3.5 Programming the Datalogger	33
Determining Size of the Array	34
Determining the Scan Rate	34
Inserting the CWB100() Instruction	34
Finishing the Program	35
3.6 Connecting the CWB100 to the Datalogger	35
3.7 Powering CWS Sensors and Initiating Auto-discovery	35
3.8 Verify that Data is being Transmitted	36
3.9 Physical Connections	36
3.9.1 Connecting the Base Station to the Datalogger	36
3.9.2 Connecting Sensors to the CWS900	37
4. Programming the Datalogger	37
4.1 Array Declaration	37
4.2 CWB100() Instruction	38
4.2.1 Configuration String	39
4.2.2 Field Names	40
4.2.3 Status Monitoring	40
4.3 ArrayIndex() Instruction	41
4.4 CWB100RSSI() Instruction	42
4.5 CWB100Routes() Instruction	42
4.6 Program Example	43
5. CWS Button and LED Behavior	45
5.1 Sensor Link to Base Station	45
5.2 Sensor Battery Voltage	45
5.3 CWS Sensor Search for Base Station	45
6. Testing the Network	46
7. Maintenance	48
7.1 Replacing a Sensor in the Network	49
7.2 Stopping or Loading a New Datalogger Program	49
8. Troubleshooting	50
Appendix A. Using DevConfig for CWS Setup	53
Appendix B. Measurement Names and Meanings	57
B.1 CWS220 Default Names	57
B.2 CWS655 Default Names	57
B.3 CWS900 Default Names	58
B.3.1 Wind Vector Calculations	60
Measured raw data:	60
Calculations:	60
Appendix C. Battery Life	65
C.1 Battery Characteristics	65
C.2 Effect of Polling Interval and Repeaters on Battery Life	65
C.3 RF Connection Type Setting	66
C.4 Repair of a Lost Connection	67