The function of matrix switch control box

The matrix switch control box is a device that combines and distributes the RF signals input by multiple input devices, and outputs the available RF signals in multiple channels at the same time. Most of the existing matrix switch control boxes use the asynchronous serial interface rs232. The control mode is controlled, and its working principle is: the switch matrix circuit is connected to the upper control circuit through the asynchronous serial interface rs232. Among them, the upper control circuit and the asynchronous serial interface rs232 are only connected to three control lines: the receiving line, the sending line and the ground line. The number of control lines is greatly reduced. The switch matrix circuit needs to parse the rs232 serial communication protocol. After successful parsing, the required 72-bit ttl control signal is output, and then the 72-bit control signal is connected to the pin driver to realize control of the switch matrix. .