Digi XStream-Pkg Manual download pdf (Page 18)

XStream‐PKG‐R™RS‐232/485RFModem–ProductManualv5.x00[2006.02.24]

Cyclic Scanning. Each RF transmission consists of an RF Initializer and payload. The wake-up

initializer contains initialization information and all receiving modems must wake during the

wake-up initializer portion of data transmission in order to be synchronized with the transmitting

modem and receive the data.

Figure3.7. CorrectConfiguration(LH>SM)

Lengthofthewake‐upinitializerexceedsthetimeintervalofCyclicSleep.Thereceiverisguaranteedtodetect

thewake‐upinitializerandreceivetheaccompanyingpayloaddata.

Figure3.8. IncorrectConfiguration(LH<SM)

Lengthofwake‐upinitializerisshorterthanthetimeintervalofCyclicSleep.Thisconfigurationisvulnerable

tothereceiverwakingandmissingthewake‐upinitializer(andthereforealsotheaccompanyingpayloaddata).

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Digi XStream-Pkg Manual Page 18