Network configurations Basic communications
XBee®-PRO 900HP/XSC RF Modules
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n The device counts each packet only once toward TT, no matter how many times the packet is
retransmitted.
Subsequent packets in acknowledged mode are similar to those in streaming mode, with the addition
of an acknowledgment between each packet, and the possibility of retransmissions. The device sends
subsequent packets without an RF initializer, because the receiving devices are already synchronized
to the transmitting device from the preceding packets and they remain synchronized for the duration
of the transmission event.
Each packet retransmission includes an RF initializer. Once the transmitting device sends all pending
data or reaches the TT limit, the acknowledged transmission event is completed.
n The transmitting device does not transmit again for exactly RN delay slots, if the local RN
parameter is set to a nonzero value.
n The receiving device does not transmit for a random number of delay slots between 0 and (RN-
1), if the local RN parameter is set to a nonzero value.
These delays can lessen congestion following long bursts of packets from a single transmitting device
when several receiving devices may be ready to transmit.
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