Product manual

9XTend‐PKG‐R™RS‐232/485RFModem–ProductManualv1.2.4
©2005MaxStream,Inc.ConfidentialandProprietary 17
3.2.4. Sleep Mode
Software Sleep
Sleep Modes enable the XTend Modem to operate at minimal power consumption when not in
use. Three Sleep Mode options are available:
• Host Controlled (Pin Sleep)
• Wake on Serial Port activity (Serial Port Sleep)
• Wake on RF activity (Cyclic Sleep)
For the modem to transition into Sleep Mode, SM (Sleep Mode) Parameter must have a non-zero
value and one of the following must occur:
1. The modem is idle (no data transmission or reception) for a user-defined period of time [See
ST (Time before Sleep) Command]
[OR]
2. GPI2 pin is asserted [GPI2 is equivalent to DTR (Data-Terminal-Ready) under RS-232
operation. Refer to the RS-232 Operation [p7] section for more information.]
While in Sleep Mode, the modem will not transmit or receive data until the modem first shifts
back to Idle Mode. The return to Idle Mode is triggered by the de-assertion of GPI2 or the arrival
of a serial byte through the DI pin. Sleep Mode is enabled and disabled using SM Command.
Table3‐02. SummaryofSleepModeConfigurations
Sleep Mode
Setting
Transition into
Sleep Mode
Transition out of
Sleep Mode
Related
Commands
Power
Consumption
Pin Sleep
(SM=1)
Host can shut down and
wake modems. Assert GPI2
(SLEEP) pin.
Note: The module will
complete a transmission or
reception before activating
Pin Sleep.
De-Assert GPI2 (SLEEP)
pin.
SM Typically 17 mA
Serial Port Sleep
(SM=2)
Automatic transition into
Sleep Mode after user-
defined period of inactivity
(no transmitting or
receiving). Period of
inactivity set using ST
Command.
When serial byte is received
on the DI pin.
SM, ST Typically 45 mA
Cyclic Sleep
(SM=4-8)
Transitions into and out of Sleep Mode in cycles (user-
selectable wake-up interval of time set by SM Command).
The Cyclic Sleep interval time must be shorter than “Wake-
up Initializer Timer” (set by LH Command).
(Can be forced into Idle Mode using GPI2 (SLEEP) pin if
PW (Pin Wake-up) Command is issued.)
HT, LH, PW, SM, ST
Typically 25 mA
(when sleeping, SM=4 ,
1 sec, @120K baud)
FormoreinformationaboutSleepModes,refertotheindividualcommandslistedin“RelatedCommands”
columnofthetable.SMCommandisthebeststartingpoint.

3.2.5. Shutdown
Hardware Sleep
Shutdown Mode offers the lowest power mode available to MaxStream modem users (< 1 µA).
This mode is not supported by the stand-alone XTend RF Modem, but is available through the
OEM RF Module that is mounted inside the stand-alone XTend RF Modem.
Contact MaxStream Technical Support for more information.