XBee‐PRO®900HP/XBee‐PRO®XSCRFModules
©2014DigiInternationalInc. 125
SL (Serial Number Low) Command
SM (Sleep Mode) Command
ST (Time before Sleep) Command
Command Summary
Description
AT Command: ATSL <Diagnostics> Read the serial number
low word of the module.
Binary Command: 0x26 (38 decimal)
Parameter Range:0 – 0xFFFF [read-only]
Number of bytes returned: 2
Related Commands: SH (Serial Number
High)
Command Summary
Description
AT Command: ATSM
<Sleep Mode (Low Power)> SM Command is used to adjust
Sleep Mode settings. By default, Sleep Mode is disabled and the
module remains continually active. SM Command allows the
module to run in a lower-powerstate and be configured in one
of eight settings. Cyclic Sleep settings wake the module after
the amount of time designated
by SM Command. If the module detects a wake-up initializer
during the time it is awake, it will synchronize with the
transmitter and start receiving data after the wake-up
initializer runs its duration. Otherwise, it
returns to Sleep Mode and continue to cycle in and out of
inactivity until the Wake-up Initializer is detected. If a Cyclic
Sleep setting is chosen, the ST, LH and HT parameters must
also be set as described in the “Sleep
Mode” section of this manual.
Binary Command: 0x01
Parameter Range:0,1 3-8
Parameter
Value
Configuration
0 Disabled
1Pin Sleep
3
Cyclic 0.5 second sleep
(Module wakes every 0.5
seconds)
4 Cyclic 1.0 second sleep
5 Cyclic 2.0 second sleep
6 Cyclic 4.0 second sleep
7 Cyclic 8.0 second sleep
8 Cyclic 16.0 second sleep
Default Parameter Value: 0
Number of bytes returned: 1
Related Commands:
For Pin Sleep – PC (Power-up Mode), PW
(Pin Wake-up)
For Serial Port Sleep – ST (Time before
Sleep)
For Cyclic Sleep – ST (Time before Sleep),
LH (Wake-up Initializer Timer), HT (Time
Before Wake-up Initializer), PW (Pin Wake-
up)
Command Summary
Description
AT Command: ATST
<Sleep Mode (Low Power)> ST
Command sets the period of time (in
tenths of seconds) in which the module
remains inactive before entering
into Sleep Mode. For example, if the ST
Parameter is set to 0x64 (100
decimal), the module will enter into
Sleep mode after 10 seconds of
inactivity
(no transmitting or receiving). This
command can only be used if
Cyclic Sleep or Serial Port Sleep Mode
settings have been selected using
SM (Sleep Mode) Command.
Binary Command: 0x02
Parameter Range:0x10 – 0xFFFF
[x 100 milliseconds]
Default Parameter Value: 0x64 (100
decimal)
Number of bytes returned: 2
Related Commands: SM (Sleep Mode), LH
(Wake-up Initializer Timer), HT (Time
before Wake-up Initializer)
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