Communication methods between computers and video equipment that are hardware based and software controlled. In the computers, RS-232 is carried through the serial port to another serial port, where the data streams serially between the computer and its peripherals - mouse, plotter, printer, etc. In the computer field there is usually a handshake protocol between the ports that operate bi-directionally. Video equipment can be controlled by either RS-232 or by RS-422 system, and as the RS-422 method connects several devices on the same line in parallel in a simple way, it is more popular in the video market. Computer controlled VCRs, editing controllers, switchers and other studio equipment are found in most video studios. In order to successfully link two pieces of hardware, they must use the same communication protocol.
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