Series 1 XBees that are running the 802.15.4 firmware support Digital and Analog Line Passing. This feature allows a radio to take an input from one XBee and directly alter the output of another XBee. Essentially acting as a wire replacement for digital and analog signals instead of just
UART data. This is unique to the 802.15.4 firmware and is not possible on any other XBee without using an external microcontroller or a programmable variant. For more information, please refer to the following KB articles:
Digital I/O Line Passing:
http://www.digi.com/support/kbase/kb...ltdetl?id=2188
Analog Line Passing:
http://www.digi.com/support/kbase/kb...ltdetl?id=2180
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