RFXCOM RFXtrx433 Especificações descarregar pdf (Página 21)

Chapter 2. Related Work/Fundamentals 14

980 320 980320

275275 1320275

"1""0"

Figure 2.6.: The bit timings of the UK and EU protocol types in µs.

two address parts. It is uncertain which part of the address represents the group or the device

code, however, bit 48 and 49 obviously describe the state code.

on: 1100011110011011000111101001110001111101001101110011000111

off: 1100011110011011000111101001110001111101001101101011000111

fixed adress1 adress2state

Figure 2.7.: On/oﬀ-message of the wall switch HE307EU.

Note that dimming functions use normal on/oﬀ-codes instead of separate control bits. Dimmers

can consequently be controlled by every type of transmitter, allowing higher ﬂexibility. For example

the dimming unit HE888 will start with the last saved brightness when turned on. By sending

a succession of on-messages, the brightness will decrease slowly until the output is turned oﬀ.

Turning the device oﬀ and on again, will restart the dimming process from maximum brightness.

The output level is saved automatically for the next start-up of the device.

Since the 0 and 1 bits are not of equal length, the whole package duration varies slightly. Therefore

no ﬁxed transmission rate can be stated. The data package from ﬁgure 2.7 contains 24 "0" and 34

"1" elements, consequently its transmission would need 67.43 ms. Each data package is followed

by a short break of up to 10 ms to allow receivers to process their data. A full transmission with

seven data packages and seven breaks will need 542 ms, resulting in a data rate of 1.84 actions/s

or 107 Bit/s

Intertechno

Intertechno (IT) is a low cost, wireless home automation system designed for simple control

tasks, such as on/oﬀ switching and scheduled switching. Complex regulations or controls are not

possible. It is very similar to HomeEasy and oﬀers about the same span of products. Intertechno

hardware or compatible devices can often be found in local hardware stores. Due to low cost and

the great availability, Intertechno devices are very common.

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RFXCOM RFXtrx433 Especificações Página 21