Specifications

Wireless Sensor Network

2. If the initial attempt fails to link to the base station, the CWS sensor will

delay 5 minutes before attempting to link again. The BLUE LED will be

off during this time. The sensor will try to link to the base at a five

minute interval a total of three times.

3. If the 5-minute interval attempt fails to link to the base station, the CWS

sensor will delay one hour before attempting to link again. The BLUE

LED will be off during this time. The sensor will try to link to the base at

a one hour interval a total of four times.

4. If the hourly attempts fail, the CWS sensor will try to connect to the base

station every 12 hours. At the beginning of each 12 hour interval it will

make three attempts spaced 5 minutes apart. This sequence will be

repeated indefinitely.

If the Setup button is not pressed to initiate auto-discovery, the wireless sensor

will automatically begin a search for the base station 12 hours after being

powered.

If discovery has been successful and the base station later loses power, the

wireless sensor keeps making measurements at the same polling interval. It

does not transmit the measured values because it only transmits data when

polled by the CWB100 base station. After 4-12 hours of no communication

with the base station, the sensor will start the autodiscovery mode and follow

the schedule shown above.

6. Testing the Network

Whenever possible it is best to bench test the network before field

installation.

Test the network by powering the sensors and verifying their RF connectivity.

This is done with the following steps:

1. Configure the wireless sensors (see Section 3, Getting Started: Creating a

Wireless Sensor Network, for details).

2. Write the datalogger program (see Section 4, Programming the

Datalogger, for details).

3. Connect the CWB100 radio base station to the datalogger with the

DATA/A channel wired to the control port specified in the Port parameter

of the CWB100 () instruction.

4. Send the program to the datalogger.

5. Connect the battery pack to the first wireless sensor. When first powered

the red LED light will hold steady for 5 seconds and then turn off. Press

the Setup button on the back of the sensor and hold it in for 8-10 seconds

to force the sensor to start searching for the base station. When the button

is first pressed, the blue LED light will flash 1 to 4 times to indicate the

sensor battery voltage (see Section 5, CWS Button and LED Behavior).

After several more seconds the blue LED will flash about once per second

as the sensor searches for the base station. It may take several minutes for

NOTE