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9XTend ‐ PKG ‐ E? ? Ethernet ? RF ? Modem ? – ? Product ? Manual ? v2.x4x ? [2007.01.04]
3.2.3. Receive Mode
If a modem detects RF data while operating in Idle Mode, the modem transitions to Receive Mode
to start receiving RF packets. Once a packet is received, the modem checks the CRC (cyclic redun-
dancy check) to ensure that the data was transmitted without error. If the CRC data bits on the
incoming packet are invalid, the packet is discarded. If the CRC is valid, the packet proceeds to the
DO Buffer.
Figure ? 3 ‐ 04. Receive ? Mode ? Data ? Flow
* ? Refer ? to ? the ? ‘Address ? Recognition’ ? sec ‐
tion ? for ? more ? information ? regarding ?
address ? recognition.
The modem returns to Idle Mode
when valid RF data is no longer
detected or after an error is
detected in the received RF data. If
serial data is stored in the DI
buffer while the modem is in
Receive Mode, the serial data will
be transmitted after the modem is
finished receiving data and returns
to Idle Mode.
3.2.4. Sleep Mode
Software Sleep
Sleep Modes enable the modem to enter states of low-power consumption when not in use. Three
software Sleep Modes are supported:
? Serial Port Sleep (Wake on Serial Port activity)
? Cyclic Sleep (Wake on RF activity)
In order to enter Sleep Mode, the following condition must be met (in addition to the modem hav-
ing a non-zero SM parameter value):
The modem is idle (no data transmission or reception) for the amount of time defined by the ST
(Time before Sleep) parameter. [NOTE: ST is only active when SM = 4-5.]
When in Sleep Mode, the modem will not transmit or receive data until the modem first transitions
to Idle Mode. All Sleep Modes are enabled and disabled using SM Command. Transitions into and
out of Sleep Modes are triggered by various mechanisms as shown in the table below.
Table ? 3 ‐ 01.
Summary ? of ? Sleep ? Mode ? Configurations
Sleep Mode
Transition into
Transition out of Sleep
Related
Power
(Setting)
Sleep Mode
Mode (wake)
Commands Consumption
the DI pin
Serial Port Sleep
(SM = 2)
Automatic transition to Sleep Mode
occurs after a user-defined period of
inactivity (no transmitting or receiving of When a serial byte is received on
data).
(SM), ST
< 210 mA
Period of inactivity is defined by the ST
(Time before Sleep) Command.
LH, PW
Cyclic Sleep
(SM = 4 - 8)
RF modem transitions in and out of Sleep Mode in cycles (user-selectable
wake-up interval of time is set using the SM command). The cyclic sleep
interval of time must be shorter than the interval of time that is defined by the (SM), ST, HT,
LH (Wake-up Initializer TImer) command.
Note: The modem can be forced into Idle Mode using the SLEEP pin if the
PW (Pin Wake-up) command is issued.
< 210 - 224 mA
when sleeping
(SM=4, 1 sec.,
@120K baud)
? ? 2007 ? MaxStream, ? Inc., ? Confidential ? & ? Proprietary ?‐? All ? Rights ? Reserved ?
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