XBee‐PRO®900HP/XBee‐PRO®XSCRFModules
©2014DigiInternationalInc. 118
LH (Wake-up Initializer Timer) Command
MD (RF Mode) Command
Command Summary Description
AT Command: ATLH
<Sleep (Low Power)> LH Command
adjusts the duration of time for which
the RF initializer is sent.
When receiving modules are put into
Cyclic Sleep Mode, they power-down
after a period of inactivity [specified by
ST (Time before Sleep) Command] and
will periodically awaken and listen
for transmitted data. In order for the
receiving modules to remain awake, they
must detect~35ms of the wake-up
initializer. LH Command must be used
whenever a receiver is operating in
Cyclic Sleep Mode. This lengthens
the Wake-up Initializer to a specific
amount of time (in tenths of a second).
The Wake-up Initializer Time must be
longer than the cyclic sleep time that is
determined by SM (Sleep Mode)
Command. If the wake-up initializer
time were less than the Cyclic Sleep
interval, the connection would be at risk
of missing the wake-up initializer
transmission. Refer to Figures 3.1 & 3.2
of the SM Command description to view
diagrams of correct and incorrect
configurations. The images help
visualize the importance that the value
of LH be greater than the value of SM.
Binary Command: 0x0C (12 decimal)
Parameter Range:0 – 0xFF
[x 100 milliseconds]
Default Parameter Value: 1
Number of bytes returned: 1
Related Commands: HT (Time before
Wake-up Initializer), SM (Sleep Mode), ST
(Time before Sleep)
Command Summary Description
AT Command: ATMD
<Networking & Security> The MD
command is used to select/read the RF
Mode (Peer-to-peer or
Repeater Modes) of the module.
Repeater Mode enables longer range via
an intermediary module. When MD=3,
the module will act as a “store and
forward” repeater. Any packets not
addressed to this node will be repeated.
A Repeater End Node (MD=4) handles
repeated messages, but will not forward
the data over-the-air. Refer to the
Repeater Mode section [p. 40] for more
information.
Binary Command: 0x32 (50 decimal)
Parameter Range: 0, 3, 4
Default Parameter Value: 0
Number of bytes returned: 1
Parameter
Configuration
0
Peer-to-Peer
(transparent operation)
3
Repeater & End Node
4
End Node
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