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EV1527 and Learning Code Remotes Explained Simple | Ripple Security and Technology

EV1527 and Learning Code Remotes Explained Simple

So what is EV1527 and Learning Code?

EV1527 is a format of learning code receivers commonly used by radio frequency transmitters such as garage door remotes. The format was designed to allow a large keyspace (number of possible unique remote identifiers) and a practical number of possible channels on each remote while still remaining cost effective.

To put it simply, learning code systems have fixed codes assigned to each remote (which do not change). These codes are then learnt into the receiver which allows them to change the state of a relay. This learning function is usually performed through a button on the receiver being held down while pressing the desired button on the transmitter.

The EV1527 data transmission format uses the following layout to identify the remote and buttons:

Each bit can be either a 0 or 1 in value. Using 20 bits for identifying the remote allows 2^20 possible remote identifiers which is a little over 1 million. This means that there is a 1 in 1 million chance of another remote having the same identifier. For this reason, the EV1527 format is not used for high security applications.

The 4 bits for button identification are a great strength of the EV1527 format. This allows for 16 channels to be controlled through one remote transmitter. This feature is perfect for systems which require activation of many different relays via one remote. 

These chip-sets can be found in devices ranging from 3V to 12V. It is important to note that the transmission distance of EV1527 chip-sets is limited by the voltage of the device.


EV1527 is often used in residential alarm systems, gate control and garage door controllers. When compared to traditional fixed code formats such as PT2262 (key space of 6561 unique addresses), EV1527 offers a much more secure and practical list of applications.

Higher security options

If EV1527 isn't going to make the cut for your setup, try a rolling code systems.

Previous article All new TideRF 4 channel Kit!


JosephHoich - February 12, 2024

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JosephHoich - February 6, 2024

Sotiris Salavracos - May 29, 2023

Please for an information
I try to find a control board to self-produce and send codes type EV1527 for learning and copy
other duplicator controls with the same code and change this code with the next code for learning and copying.
If you know something about it, please inform me
Thank you

Undisclosed - September 29, 2022

Note that in the common basic protocol the full transmission (remote control keypress) consists of a preamble of one appr.. 320 microseconds pulse (“1”) followed by 31 zeros of the same time size (320 X 31 ~ 9900 micros, immediately followed by the 20 bits address and 4 command (button) bits all of the same time size.

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