Configuration and commands Sleep commands
XBee®-PRO 900HP/XSC RF Modules
225
LH (Wakeup Initializer Timer)
Sets or displays the duration of time during which the wake-up initializer is sent. When receiving
devices are in Cyclic Sleep Mode, they power-down after a period of inactivity as specified by the ST
parameter and will periodically wake and listen for data transmissions. In order for the receiving
devices to remain awake, they must detect ~35 ms of the wake-up initializer.
You must use LH whenever a receiving device is operating in Cyclic Sleep mode. The wake-up
initializer time must be longer than the cyclic sleep time, which is set by the SM (Sleep Mode)
parameter. If the wake-up initializer time is less than the Cyclic Sleep interval, the connection is at
risk of missing the wake-up initializer transmission.
To view a diagram of the correct configuration, see SM (Sleep Mode).
Binary command
0x0C (12 decimal)
Parameter range
0 - 0xFF [x100 milliseconds]
Default
1
Bytes returned
1
PW (Pin Wakeup)
Enables or disables the sleep pin.
Under normal operation, a device in Cyclic Sleep mode cycles from an active state to a low-power
state at regular intervals until it is ready to receive data. If you set PW to 1, you can use the SLEEP pin
(pin 26) to wake the device from Cyclic Sleep. When you de-assert (low) the SLEEP pin, the device is
operational and will not go into Cyclic Sleep.
Once you assert the SLEEP pin, the device remains active for the period of time specified by the ST
parameter and returns to Cyclic Sleep mode if no data is ready to transmit. PW is only valid if Cyclic
Sleep is enabled.
Binary command
0x1D (29 decimal)
Parameter range
0 - 1
Parameter Configuration
0 Disabled
1 Enabled
Default
0
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