Operation UART flow control
XBee®-PRO 900HP/XSC RF Modules
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the serial transmit buffer does not have enough space for all of the data bytes, it discards the entire
RF data packet.
The UART Data Present Indicator is a useful feature when using RTS flow control. When enabled, the
DIO1 line asserts (low asserted) when UART data is queued to be transmitted from the module. For
more information, see D1 (DIO1/AD1).
If the device sends data out the UART when RTS is de-asserted (set high) the device could send up to
five characters out the UART port after RTS is de-asserted.
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