AT commands
Network and security commands
Digi XBee® 3 802.15.4 RF Module User Guide
129
Bit Meaning
Setting Description
0
1
TX
compatibility
0
Transmissions are optimized as follows:
1. Maximum transmission size is affected by multiple factors (
MM
,
MY
,
DH
,
DL
, and
EE
). See
. In the best
case, with no app header, short source and destination
addresses, and no encryption, the maximum transmission size
is 116 bytes.
2. Multiple messages can be present simultaneously on the active
queue, providing they are all destined for different addresses.
This improves performance.
1
Transmissions operate like the Legacy 802.15.4 module, which means
the following:
1. Maximum transmission size is 95 bytes for encrypted packets
and 100 bytes for un-encrypted packets. These maximum
transmission sizes are not adjusted upward for short
addresses or for lack of an APP header.
2. Only one transmission message can be active at a time, even if
other messages in the queue would go to a different
destination address.
1
Node
Discovery
compatibility
0
Node discovery operates like other XBee devices and not like the
Legacy 802.15.4 module. This means the following:
1. A directed
ND
request terminates after the single response
arrives. This allows the device to process other commands
without waiting for the
NT
to time out.
2. The device outputs an error response to the directed
ND
request if no response occurs within the time out.
1
The module operates like the Legacy 802.15.4 module, which has the
following effect:
1. When the expected response arrives, the command remains
active until
NT
times out. (
NT
defaults to 2.5 seconds.) This
prevents the device from processing any other AT command,
even if the desired response occurs immediately.
2. When the timeout occurs, the command silently terminates and
indicates success, whether or not a response occurred within
the
NT
timeout.
Default
0x00
1
This bit does not typically need to be set. However, when the XBee 3 802.15.4 RF Module is streaming
broadcasts in transparent mode to a Legacy 802.15.4 module (S1 hardware), and
RR
> 0, set this bit to avoid a
watchdog reset on the Legacy 802.15.4 module.
