XIB-R【PDF 13/36 页】BOARD INTERFACE RS232/485

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Serial Port Sleep (SM = 2)

"Wake on serial port activity

Serial Port Sleep is a Sleep Mode setting in which the modem runs in a low power state until data

is detected on the DI pin.

When Serial Port Sleep is enabled, the modem goes into Sleep Mode after a user-defined period of

inactivity (no transmitting or receiving of data). This period of time is determined by ST (Time

before Sleep) Command. The modem returns to Idle Mode once a character is received through

the DI pin.

Cyclic Sleep (SM = 3-8)

Cyclic Sleep is the Sleep Mode setting in which the XCite Module enters into a low power state and

awakens periodically to determine if any transmissions are being sent.

When Cyclic Sleep settings are enabled, the XCite Module goes into Sleep Mode after a user-

defined period of inactivity (no transmission or reception on the RF channel). The user-defined

period is determined by ST Parameter. [See ST (Time before Sleep) Parameter]

While the modem is in a low-power state, CTS

de-asserted (high) to indicate that data should not

be sent to the modem during this time. When the modem awakens to listen for data, CTS

asserted and any data received on the DI Pin is transmitted. The PWR pin is also de-asserted (low)

when the modem is in Cyclic Sleep Mode. These pins are asserted each time the modem cycles

into Idle Mode to listen for valid data packets and de-asserts when the modem returns to Sleep

Mode.

The modem remains in Sleep Mode for a user-defined period of time ranging from 0.5 seconds to

16 seconds (SM Parameters 3 through 8). After this interval of time, the modem returns to Idle

Mode and listens for a valid data packet for 100 ms. If the modem does not detect valid data (on

any frequency), the modem returns to Sleep Mode. If valid data is detected, the modem transi-

tions into Receive Mode and receives the incoming packets. The modem then returns to Sleep

Mode after a Period of inactivity that is determined by ST "Time before Sleep" Parameter.

The modem can also be configured to Wake-up from cyclic sleep when the SLEEP pin is de-

asserted (low). To configure a modem to operate in this manner, PW (Pin Wake-up) Command

must be issued. Once the Sleep pin is de-asserted, the modem is forced into Idle Mode and can

begin transmitting or receiving data. It remains active until no data is detected for the period of

time specified by the ST parameter, at which point it resumes its low-power cyclic state.

Note: The cyclic interval time defined by SM (Sleep Mode) Command must be shorter than the interval

time defined by LH ("Wake-up Initializer Timer") Command. For example: If SM=4 (Cyclic 1.0 second

sleep), the LH Parameter should equal 0xB ("1.1" seconds). With these parameters set, there is no risk

of the receiving modem being asleep for the duration of the wake-up initializer transmission. The fol-

lowing section "Cyclic Scanning" explains in further detail the relationship between "Cyclic Sleep" and

"Wake-up Initializer Timer"

Cyclic Scanning. Each RF transmission consists of a wake-up initializer and payload data. The

wake-up initializer contains initialization information and all receiving modems must Wake-up dur-

ing the wake-up initializer portion of data transmission in order to synchronize with the transmitter

and receive the data.

The cyclic interval time defined by the SM (Sleep Mode) command must be shorter than the interval

time defined by LH (Wake-up Initializer Timer) command.

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