The necessity of SA809 wireless transceiver module with DTMF functionality for intercom in access control systems

With the advancement of wireless technology, the security of access control systems has evolved beyond simple door control. The new generation of access control system solutions emphasizes both security and convenience. Features such as voice intercom and quick command operations are highly valued. Advanced access control systems can also be integrated with cameras and surveillance devices, enabling comprehensive security protection through interactive communication with the access control system using digital keypads. The latest access control solutions can be implemented using DTMF functionality for intercom purposes.

The DTMF intercom functionality allows users to send specific digital signals by pressing numeric keys on the transmitting end, which are then identified by the receiving end. This enables digital communication between users, such as calling on designated channels, sending specific commands for visitor verification, and facilitating remote door unlocking.

The SA809 series is a self-developed RF transceiver module by NiceRF, consisting of the SA809-TX transmitter module and the SA809-RX receiver module. The transmitter can be used with any analog intercom device with DTMF functionality, such as Motorola's GP338. The receiver decodes the signals received from the transmitter, performs verification, and then outputs high power through Mosfet. With a transmitting power of up to 5W, the SA809-TX ensures long communication distances, making it a cost-effective wireless remote control solution. Additionally, the SA809 can be customized based on specific customer requirements. It is produced and tested with strict lead-free technology, complying with RoHS and Reach standards.

Introduction to SA809 DTMF Intercom Solution：

The transmitter end is equipped with DTMF functionality, and the module can transmit DTMF tone signals of any length and any numeric combination by switching to PTT ON mode. Pressing any numeric key from 0 to 9 will trigger the DTMF transmission function once.

After the receiver is powered on, it enters the DTMF reception mode, and the output end controls the Mosfet to output a 3-second high-level signal. The receiver has a sensitivity of up to -124dBm, allowing users to achieve control over a distance of more than 5 kilometers in open areas using commonly available analog walkie-talkies with DTMF functionality.

The module internally uses a 1.5PPM TCXO crystal oscillator with a 25KHz bandwidth, ensuring stable frequency even with temperature variations. By connecting to a PC terminal, users can freely set frequencies ranging from 400MHz to 480MHz with a 25KHz interval, providing a total of 6400 channels. Additionally, combining the option to set 1-9 digit password combinations ensures the security and reliability of the system control.

Upon power-up, the receiver enters DTMF reception mode, and the output terminal controls the Mosfet to output a high-level signal for 3 seconds. The receiver has a sensitivity of up to -124dBm, allowing users to achieve control over a distance of more than 5 kilometers in open areas using commonly available analog intercoms with DTMF functionality.

The module internally uses a 1.5PPM TCXO crystal oscillator and a 25KHz wideband, maintaining frequency stability even with temperature variations. By connecting to a PC, users can freely set frequency points ranging from 400MHz to 480MHz with 25KHz intervals, providing a total of 6400 channels. Combined with the configurable 1 to 9 digit password combinations, this ensures the security and reliability of the system control.

How to configure SA809-Rx?

In conclusion, the DTMF intercom feature of the SA809 wireless transceiver module not only enables remote unlocking in the access control system but also provides additional convenience through voice interaction and command transmission. The DTMF intercom feature enhances the functionality and flexibility of the access control system, further improving its security and convenience.