User's Guide

Operation Networking
XBee/XBee-PRO S2C 802.15.4 RF Module User Guide
44
Mac ACK
Config
Destination reachable Destination unreachable
CCA failure
happened
TX status
Retries
TX status
Retries
TX
status
Retries
MAC App MAC App MAC App
Enabled 00
(Success)
up to 3
per app
retry
up to
RR
value
21
(Network
ACK Failure)
3 RR
value
02 (CCA
failure)
3 RR
value
Disabled 00
(Success)
0 up to
RR
value
21
(Network
ACK Failure)
0 RR
value
02 (CCA
failure)
3 RR
value
Peer-to-peer networks
By default, XBee/XBee-PRO S2C 802.15.4 RF Module modules are configured to operate within a peer-
to-peer network topology and therefore are not dependent upon master/slave relationships. This
means that devices remain synchronized without the use of master/server configurations and each
device in the network shares both roles of master and slave. Our peer-to-peer architecture features
fast synchronization times and fast cold start times. This default configuration accommodates a wide
range of RF data applications.
Master/slave networks
In a Master Slave network, there is a coordinator and one or more end devices. When end devices
associate to the coordinator, they become members of that Personal Area Network (PAN). As such,
they share the same channel and PAN ID. PAN IDs must be unique to prevent miscommunication
between PANs. Depending on the A1 and A2 parameters, association may assist in automatically
assigning the PAN ID and the channel. These parameters are specified below based on the network
role (end device or coordinator).
End device association
End device association occurs if CE is 0 and A1 has bit 2 set. See the following table.
Bit Hex value Meaning
0 0x01 Allow PAN ID reassignment
1 0x02 Allow channel reassignment
2 0x04 Auto association
3 0x08 Poll coordinator on pin wake