Home » Campbell Scientific Manuals » Electronics Accessories » Campbell Scientific CWS220 » Manual Viewer

Campbell Scientific CWS220 Wireless Sensor Network (CWB100, CWS220, and CWS900 - Page 33

Programming the Datalogger

View all Campbell Scientific CWS220 manuals

Add to My Manuals
Save this manual to your list of manuals

Page 33 highlights

Wireless Sensor Network transmitted by wireless sensors. See Section 4.2.1 for more information on the format and use of the configuration string. After the configuration settings have been sent to the base station and wireless sensors, the sensor configuration file may be sent to the datalogger. The datalogger must then be programmed to access that file using the third parameter of the CWB100 instruction. See Section 5 for programming details. To send the sensor configuration file to the datalogger, connect a serial cable or USB-to-serial cable to the RS-232 port between the computer and the datalogger. Select the Send a sensor configuration file to the datalogger attached item in the Configure Devices list, then select Click Here. Enter the correct COM port number for the cable that attaches to the datalogger. Ensure that the datalogger is powered as described in the dialog box. The datalogger's PakBus address does not need to be specified for this transaction but if a security code is present in the datalogger, that code needs to be entered in the Datalogger Security Code field. Click Connect to send the configuration file to the datalogger. 3.5 Programming the Datalogger The datalogger program must include a destination array large enough to store all the values returned by the wireless sensors and a scan that includes a CWB100() instruction. The scan interval must be large enough to allow the sensors time to transmit. In this example, the program will simply collect data from the two wireless sensors once per minute and store a sample of each value collected. For additional details and advanced programming examples, see Section 4. Begin by opening the CRBasic editor in LoggerNet, PC400 or RTDAQ software. Select New CR1000 Program File to begin editing the datalogger program. For information on writing datalogger programs or using the CRBasic editor, see the CR1000 and LoggerNet manuals. Additionally, the CRBasic editor help file has an example program for the wireless sensor instructions. 25

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

Match case Limit results 1 per page

Wireless Sensor Network

transmitted by wireless sensors.

See Section 4.2.1 for more information on the

format and use of the configuration string.

After the configuration settings have been sent to the base station and wireless

sensors, the sensor configuration file may be sent to the datalogger.

The

datalogger must then be programmed to access that file using the third

parameter of the CWB100 instruction.

See Section 5 for programming details.

To send the sensor configuration file to the datalogger, connect a serial cable or

USB-to-serial cable to the RS-232 port between the computer and the

datalogger.

Select the

Send a sensor configuration file to the datalogger attached

item

in the Configure Devices list, then select

Click Here

Enter the correct COM

port number for the cable that attaches to the datalogger.

Ensure that the

datalogger is powered as described in the dialog box.

The datalogger’s PakBus

address does not need to be specified for this transaction but if a security code

is present in the datalogger, that code needs to be entered in the Datalogger

Security Code field.

Click Connect to send the configuration file to the

datalogger.

3.5

Programming the Datalogger

The datalogger program must include a destination array large enough to store

all the values returned by the wireless sensors and a scan that includes a

CWB100() instruction.

The scan interval must be large enough to allow the

sensors time to transmit.

In this example, the program will simply collect data from the two wireless

sensors once per minute and store a sample of each value collected.

For

additional details and advanced programming examples, see Section 4.

Begin by opening the CRBasic editor in LoggerNet, PC400 or RTDAQ

software.

Select New CR1000 Program File to begin editing the datalogger

program.

For information on writing datalogger programs or using the

CRBasic editor, see the CR1000 and LoggerNet manuals.

Additionally, the

CRBasic editor help file has an example program for the wireless sensor

instructions.