Lh (Wake-Up Initializer Timer) Command; Md (Rf Mode) Command - Digi XTend User Manual

LH (Wake-up Initializer Timer) Command

<Sleep (Low Power)> The LH Command is used to set/read the duration of time during which the wake-up initializer is
sent. When receiving modules 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 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 receiving module is operating in Cyclic Sleep Mode. The Wake-up Initializer
Time must be longer than the cyclic sleep time that [as determined by SM (Sleep Mode) parameter]. 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 located under the SM command description to view diagrams of correct and incorrect configurations.
The images emphasize that the LH value must be greater than the SM value.
AT Command: ATLH
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)

MD (RF Mode) Command

<Networking and Security> The MD command is used to select/read the settings that enable the Polling and Repeater
Modes on the module.
Polling Mode - A 'Polling Base' is responsible for polling remotes. A 'Polling Remote' requires a poll in order to
transmit.
Repeater Mode - A 'Repeater' re-sends RF data unless the transmission is addressed to it or if the transmission has
already been detected. A 'Repeater End Node' handles repeated messages, but will not repeat the message over-the-
air.
Refer to the Polling and Repeater Mode sections of the 'RF Communication Modes' chapter for more information.
AT Command: ATMD
Binary Command: 0x31 (49 decimal)
Parameter Range: 0 - 6
Parameter
0
1
2
3
XTend RF Module User Guide
Configuration
Transparent Operation (Repeater Base)
[reserved - not used]
[reserved - not used]
Polling Base
Command descriptions
41