Digi XBee3 802.15.4 User Manual

Networking Networking terms
Digi XBee3® 802.15.4 RF Module User Guide
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Networking terms
The following table describes some common terms we use when discussing networks.
Term Definition
Association Establishing membership between end devices and a coordinator.
Coordinator A full-function device (FFD) that allows end devices to associate to it and can queue
and deliver indirect messages.
End device When in the same network as a coordinator. Devices that rely on a coordinator for
synchronization and can be put into states of sleep for low-power applications.
PAN Personal Area Network. A data communication network that includes one or more
end devices and optionally a coordinator.
MAC Mode configuration
Medium Access Control (MAC) Mode configures two functions:
1. Enables or disables the use of a Digi header in the 802.15.4 RF packet.
When the Digi header is enabled (MM = 0 or 3), duplicate packet detection is enabled as well as
certain AT commands.
MAC Modes 1 and 2 do not include a Digi header, which disables many features of the device. All
data is strictly pass-through. These modes are intended to provide some compatibility with
third-party 802.15.4 devices.
2. Enables or disables MAC acknowledgment request for unicast packets.
When MACACK is enabled (MM = 0 or 2), transmitting devices send packets with an ACK
request soreceiving devices send an ACK back (acknowledgment of RF packet reception)to
the transmitter. If the transmitting device does not receive the ACK, it re-sends the packet
upto three times or until the ACK is received.
MAC Modes 1 and 3 disable MAC acknowledgment. Transmitting devices send packets without
an ACK request soreceiving devices do not send an ACK back to the transmitter.
Broadcast messages are always sent with the MACACK request disabled.
The followingtable summarizesthe functionality.
Mode Digi header MAC ACK
0 (default) X X
1
2 X
3 X
The default value for the MM configuration parameter is 0 which enables both the Digi header and
MAC acknowledgment.

Digi XBee3 802.15.4 Specifications

General

Brand	Digi
Model	XBee3 802.15.4
Category	Control Unit
Language	English