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XStream‐PKG‐E™EthernetRFModem–ProductManualv5.x00[2006.02.24]

3.1.3. Receive Mode

If a modem detects RF data while operating in Idle Mode, the modem transitions into Receive

Mode to start receiving RF packets.

Figure3‐04. ReceptionofRFDataÆ

After a packet is received, the modem checks the

CRC (cyclic redundancy 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.

The modem returns to Idle Mode after 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.

3.1.4. Sleep Mode

Sleep Modes enable the XStream Modem to operate at minimal power consumption when not in

use. Three Sleep Mode options are available:

• Pin Sleep (Host Controlled)

• Serial Port Sleep (Wake on Serial Port activity)

• Cyclic Sleep (Wake on RF activity)

For the modem to transition into Sleep Mode, the modem must have a non-zero SM (Sleep Mode)

Parameter and one of the following must occur:

1. The modem is idle (no data transmission or reception) for a user-defined period of time

[Refer to ST (Time before Sleep) Command].

2. SLEEP pin is asserted (only for Pin Sleep option).

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

Setting

Transition into

Sleep Mode

Transition out of

Sleep Mode

Commands

Pin Sleep

(SM = 1)

A microcontroller can shut down and wake modems by

asserting (high) SLEEP pin.

Note: The module will complete a transmission or

reception before activating Pin Sleep.

De-assert SLEEP pin. SM

Serial Port Sleep

(SM = 2)

Automatic transition to Sleep Mode occurs after a user-

defined period of inactivity (no transmitting or receiving

of data). The period of activity is defined using the ST

(Time before Sleep) Command.

When serial byte is

received on the DI pin.

SM, ST

Cyclic Sleep

(SM = 3-8)

Automatic transition to Sleep Mode occurs in cycles as

defined by the SM (Sleep Mode) Command.

Note: The cyclic sleep time interval must be shorter than

the “Wake-up Initializer Timer” (set by LH Command).

After the cyclic sleep time

interval elapses.

Note: Modem can be

forced into Idle Mode if PW

(Pin Wake-up) Command

is issued.

SM, ST, HT, LH,

For more information about Sleep Modes, refer to the individual commands listed in “Related

Commands” column of the table.

1 2 ... 10 11 12 13 14 15 16 17 18 19 20 ... 55 56

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