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Chapter 2. Related Work/Fundamentals 15

There are two diﬀerent types of devices: The classic system, which uses manual address selection

and a newer system with learning function. In this work, only the manual system is considered.

Figure 2.8.: Two IT receivers: classical devices with manual address selection on the left and a

newer one with learning capability on the right. (source: www.intertechno.at)

Speciﬁcations The address range of the classic version includes four bits for the family code

and four bits for the device number; accordingly a total of 256 diﬀerent devices can be addressed

individually. The family code can range from A to P (equals 0 to 15) and has the purpose to

group devices to simplify numbering and classiﬁcation. These groups can be switched as a whole

by some remotes. Both codes can be set via rotary encoder or dip switches. Transmitter and

receiver can be linked by setting the same address on both units (family and device code). Units

with manual address selection have a built in IC HX2262 (transmitter) or HX2272 (receiver) as

their centerpiece. These chips were designed for remote controls, and are commonly found in a

variety of products, such as garage door openers or in infrared remote controls. They have 12

tri-state inputs which can be used as address or data lines (see ﬁgure 2.9). Self-learning devices

use a dedicated microcontroller instead.

HX2262

Data

out

Radio

A0..A3

A.. P

familycode

A4..A7

0..15

device number

familycode

keys

D0..D3

enable

HX2272

Data

Radio

outputs

D0..D3

A0..A3

A.. P

A4..A7

0..15

device number

Figure 2.9.: Diagram showing the structure of a HX2262/72 couple.

By using the popular HX2262 chip, Intertechno devices are often compatible to other automation

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