MaxStream 9XTend-PKG-E Manuel télécharger pdf (Page 16)

9XTend‐PKG‐E™EthernetRFModem–ProductManualv2.x4x[2007.01.04]

©2007MaxStream,Inc.,Confidential&Proprietary‐AllRightsReserved 16

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‘A d d r e ss 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):

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.

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.]

Table3‐01. SummaryofSleepModeConfigurations

Sleep Mode

(Setting)

Transition into

Sleep Mode

Transition out of Sleep

Mode (wake)

Commands

Power

Consumption

Serial Port Sleep

(SM = 2)

Automatic transition to Sleep Mode

occurs after a user-defined period of

inactivity (no transmitting or receiving of

data).

Period of inactivity is defined by the ST

(Time before Sleep) Command.

When a serial byte is received on

the DI pin

(SM), ST < 210 mA

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

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.

(SM), ST, HT,

LH, PW

< 210 - 224 mA

when sleeping

(SM=4, 1 sec.,

@120K baud)

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 61 62

Commentaires sur ces manuels

Pas de commentaire

MaxStream 9XTend-PKG-E Manuel Page 16

Commentaires sur ces manuels

Produits connexes et manuels pour Mise en réseau MaxStream 9XTend-PKG-E