Infrared remote control plays an important role in the field of smart home, and its communication protocol is the key to achieve device control. The following are several common infrared remote control communication protocols, which enable the infrared remote control to communicate effectively with a variety of smart devices.
1.NEC protocol: This is one of the most commonly used infrared remote control protocols, widely used in TV remote control, air conditioning remote control and so on. The NEC protocol represents a digital signal by modulating an infrared carrier frequency signal, each digital signal is separated by a 9ms start bit and a 4.5ms start bit, and then consists of a 16-bit address code, a 16-bit data code, and an 8-bit reverse code. This protocol is characterized by the use of 38kHz carrier frequency, and the data “0” and data “1” are encoded differently, respectively, 0.56ms carrier followed by 0.56ms carrier-free “0”, 0.56ms carrier followed by 1.685ms carrier-free “1”.
2.Sony SIRC Protocol: This is an infrared communication protocol developed by SONY Corporation and commonly used in Sony-branded devices. The distinguishing feature of the SIRC protocol is that it uses different time intervals to represent “0” and “1” and has specific start and stop codes.
3.RC-5 protocol: RC-5 is a relatively simple infrared communication protocol, often used in DVD players and audio equipment. It consists of a start bit, a 5-bit address code, a 6-bit command code, and a 1-bit inverse code, for a total of 13 bits of binary data.
4.RC-6 protocol: As an upgraded version of RC-5, RC-6 provides more features and lower bit error rate. It consists of a start bit, a 2-bit system code, a 5-bit address code, an 8-bit command code, a 1-bit inverse code, and a 3-bit extension code, for a total of 20 bits of binary data.
5.Samsung Protocol: This is an infrared communication protocol used by Samsung with specific coding rules and time intervals to control Samsung-branded TVS and other devices.
These communication protocols enable the infrared remote control to accurately communicate and control with various smart devices. For example, through the NEC protocol, the infrared remote control can send specific signals to control the channel switching or volume adjustment of the TV. The RC-5 protocol allows the infrared remote control to communicate with the DVD player to achieve playback, pause and other functions. What these protocols have in common is that they all use infrared light waves for signal transmission, but the specific coding rules and time intervals are different to adapt to different devices and application scenarios.
To sum up, the communication protocol of the infrared remote control is the basis for realizing smart home control, which enables the infrared remote control to effectively communicate and control with various devices, thereby enhancing the user’s smart home experience.