RFD21815 View Datasheet(PDF) - Unspecified

Part Name

Description

Manufacturer

RFD21815

Shield for Arduino

Unspecified 

© Copyright, RF Digital

10/15/2012 12:58 PM

RoHS CE • ESTI

RFD21815 FCC • IC

Approved & Certified

13715 Alton Pkwy • Irvine • CA • 92618

Tel: 949.610.0008 • www.RFdigital.com

Fast Answers: support@rfdigital.com

RFDP8

Shield for

Arduino

RFD21815

Learn & Network mode

Electronic Serial Number

Every RF Digital Module has its own 32-bit unique identifier (over 4 billion unique

values), known as the Electronic Serial Number, or ESN. This value is assigned at the

factory and cannot be changed by the user.

Network Mode

The UART and the Receiver with logic output can be configured to accept data only

from transmitters with which it has been associated, i.e. in its network. When in

network mode, a module must “learn” the ESN of any module which it wishes to

“hear." The LEARN signal (listed in the UART and receiver sections below) is usually

an input, pulled to GND through an external resistor. When LEARN is driven high for

at least 20ms and then allowed to return to GND, the module enters learning mode.

While in learning mode, the LEARN signal is changed to an output and driven high

which will light up D3 (learn LED). During this time, the module will learn the ESN of

the first module that sends any data; the data will be discarded, the ESN of the

transmitting module will be learned by the receiving module. The receiving module

indicates that it has learned the ESN by toggling the LEARN LED on and off quickly

three times. After learning the transmitting modules ESN, or after 10 seconds pass,

the module will exit learning mode by driving LEARN low and changing it back to an

input.

Modules can learn up to 60 unique ESN’s. ESN’s cannot be deleted individually. The

list of learned ESN’s can be completely cleared by holding the LEARN signal high for

at least 10 seconds and then releasing it. The module will erase it’s ESN list, and then

drive the LEARN LED in a fast alternating high/low pattern for a few seconds to

indicate that the ESN list is now empty.

Once a module has learned the ESN of another module, it will accept any and all data

from that module only and not any other modules. Up to 60 unique transmitters can be

taught to one receiver. If a module is configured to any of the 3 Network modes and it

has not learned any transmitters ESN, then it will not receive and therefore it will not

output any data, until it learns at least one transmitter.

This network feature can be used for peer-to-peer networks, point to multi-point

networks, multi-point to multi- point networks. The association can be between two

units for simple functions like opening a garage door or with many units to form

complex networks with multiple nodes.

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