In this tutorial you will change the Device ID of a RF module. The Device ID is what uniquely identifies each module on a Personal Area Network (PAN). The PanID is a 5 digit numeric identifier (00000-99999). As shown in the below diagram the PanID is used to group RF Modules (including base stations).
![]() The Device ID is two character identifier. You can change the Device ID of any RF module using the CHDEVID command. The PrivateEyePi server requires a numeric ID (like 89), but you can change the ID using any characters (like AB) from 34-122 on the ASCII table (basically most of the letters on a keyboard).
Theoretically this allows you to have 7,744 unique identifiers for a sensor, but only 100 with PrivateEyePi on each PAN.
You can also use frequencies and channels to further diversify your network, if required. Each device supports 6 frequencies, 10 channels per frequency, 99,999 PAN's per channel, and 7,744 Device ID's per PAN. Theoretically this design supports 16M devices in a given area.
What you will need:
Step 1 : Open a terminal session on the Raspberry Pi and establish connectivity with the device on which you wish to change the DeviceID. Type the following command:
python rf_config.py 03 HELLO
Watch for the following response:
sending : a03HELLO response is : a03HELLO---- You don't always need to do this step. You could start with step 2, but its a good idea to check if the device you are wanting to configure is up and running and accepting and responding to commands.
Step 2 : Use the CHDEVID command to change the device ID
In this example I will change the Device with Device ID of 03 to 45.
python rf_config.py 03 CHDEVID45 sending : a03CHDEVID45 response is : a03CHDEVID45
The fact that you received "
a03CHDEVID45 " as a response means that the change was successful. You can now test if the device is responding to the new ID by sending a HELLO message to the new Device ID.python rf_config.py 45 HELLO sending : a45HELLO response is : a45HELLO---- In above examples we changed the Device ID over the air, but you could also use the same commands over the serial port of a device. Note that in order to communicate with a device over the serial port the device must be a Type 2 sensor. Refer xyz tutorial on Sensor Types.
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