2 Channel Rolling Code Transmitter
Using a 2 Channel Rolling Code Transmitter you can easily control a garage door or gate to open and close. Unlike simple remote controls, this transmitter uses a rolling or hopping code which changes for each use of the device.
In order to prevent a person from recording the same code over and over again, a backward window of all of the received codes is compared. If the received code is within this trailing window, the system will not accept the code.
Key Features
The 2 Channel rolling code transmitter has been designed to operate in the 433MHz frequency range and is suited to use with automated gates and garage door operators. Its tough case and low price make it a popular choice among installers.
The transmitter consists of an antenna, circuit board and a battery. It is designed to be mounted on the exterior of a garage door opener or gate controller.
When a user pushes a button on the transmitter, the transmitter transmits an encrypted radio frequency (RF) transmission comprising an interleaved trinary bit fixed code and a rolling code. The receiver demodulates the encrypted RF transmission and recovers the fixed code and rolling code, upon comparison with stored codes, to provide a signal to actuate an electric motor to open or close a movable component.
To provide additional security, the fixed code and the rolling code are shuffled so that alternating trinary bits are comprised of a fixed code bit and a rolling code bit to yield a total of 40 trinary bits. The trinary bits are then packaged in a first 20-trinary bit frame and a second 20-trinary bit frame each having a single synchronization and/or identification pulse indicating the start of the frame and whether it is the first frame or the second frame.
Upon reception of the RF signal from the receiver, the fixed code is compared with a previously stored code in the receiver to determine whether it matches and if so, control is transferred to step 780 where the rolling portion of the code is checked against a non-volatile memory to determine if it has been received. If the rolling portion has been received, control is transferred to a step 782 where the program indicator is switched off and the operation command word is set causing the operator to cause the door to open or close as commanded.
In the event that there is not a match, control is transferred to a step 768 where the next valid code is read until two successive codes have been read or the program mode is terminated. The code window is then gradually reduced until a code does not match or the receiver detects a signal condition indicative of a lack of security.
Specifications
A 2 Channel Rolling Code Transmitter is a great addition to any security system. These transmitters offer longer range, up to 250m (820ft), less interference jamming and excellent reliability. They are also the perfect solution for operating parking lot gates, garage doors or handicap doors.
A rolling code is a cryptographic scheme that uses random numbers to generate a unique sequence of codes which are sent by a remote control or device, then compared to a receiver’s pre-programmed sequence. The resulting encryption is difficult to decipher, even for the most sophisticated computer.
An RF circuitry is used to transmit the codes, which are then demodulated by the receiver. The receiver then compares these codes with stored ones to determine whether or not the transmission was from an authorized source. The aforementioned is the most common use for a rolling code, which is usually incorporated into a passive keyless entry (PKE) system.
The most effective rolling code system is a combination of a hopping code and a fixed code that’s encrypted with a random number generator. These two elements provide a level of security that eavesdroppers simply can’t match.
This double channel receiver is capable of self-learning and automatic recognition of both rolling code and dip switch remote controls. Its memory cip capacity of 200 programmed remote controls is ample for any application.
This transmitter is the most reputable and the best value in its class. Please contact us for more information. Our knowledgeable staff is happy to help! We are here to answer your questions and assist you in the design of a security system that works best for you. We will be able to save you money and time!
Installation Instructions
A 2 Channel Rolling Code Transmitter uses a combination of fixed and rolling codes to communicate with an electronic receiver. Each number that is transmitted is compared against a previously stored code to verify that it is the correct one. If the receiver receives a code that matches, it will activate an electric motor to open or close a movable component. This system is commonly used in automobile security systems to authenticate the transmission of a code and prevent an attacker from opening or shutting down the car door.
A remote learning feature allows you to enter a new transmitter without having to touch the receiver, saving it in the device’s memory. The device will then recognize the remote learning function, making it easier for you to operate the garage door opener. You can train up to three buttons at a time. This process is performed by pressing and releasing the button for up to 20 seconds. After this, the indicator light will flash and HomeLink should activate your device.
Note: ARC and HCS Rolling Code transmitters cannot be saved on the same receiver simultaneously, as these two types of encoding are not compatible with each other. This is because the logic (or dip/switch) CVAR is OFF for ARC, and ON for HCS when the first transmitter stored is an ARC.
Relay activation mode is selected in either impulse or ON/OFF using the programming tool (only with relay 1). Upon receiving a code, the receiver checks whether it is in its memory and activates the corresponding relay. If it is, the pilot lights are activated every 5 seconds to indicate that the corresponding relay has been activated. If it is not, the receiver will continue to check its memory for the next code.