XBee-PRO XSC RF Module operation Operating modes
XBee®-PRO 900HP/XSC RF Modules
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Data Out (DO) buffer and flow control
When a device receives RF data, the data enters the DOUT buffer and the device sends it out the serial
port to a host device. Once the DOUT buffer reaches capacity, it loses any additional incoming RF data.
In the following situations, the DOUT buffer may become full and overflow:
1. If the RF data rate is set higher than the interface data rate of the device, the devices receives
data from the transmitting device faster than it can send the data to the host.
2. If the host does not allow the device to transmit data out from the DOUT buffer because of
being held off by hardware or software flow control.
Hardware flow control (RTS)
If you enable RTS for flow control (RT = 2), data will not be sent out the DO Buffer as long as RTS (pin
16) is de-asserted.
Software flow control (XOFF)
You can enable XON/XOFF software flow control using FL (Software Flow Control). This option only
works with ASCII data.
Operating modes
This section describes the different operating modes for the device.
Idle mode
When not receiving or transmitting data, the device is in Idle mode. During Idle mode, the device
listens for valid data on both the RF and serial ports.
The device shifts into the other modes of operation under the following conditions:
n Transmit mode (serial data in the serial receive buffer is ready to be packetized).
n Receive mode (valid RF data received through the antenna).
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