485 sharing type number: AD2804G

485 sharing apparatus is a section to solve multiple 485 master control equipment common to control the front end 485 from equipment (like the table, the ball machine, decoder, etc.) the best auxiliary tool, in many video monitoring project, the original monitoring just staff through the control keyboard to monitor yuntai, yuntai image data transmission to monitor let staff monitoring. The video data is stored on magnetic tape, or no storage. With the popularity of the hard disk video recorder, yuntai get video data transmission, storage to hard disk video recorder become feasible. But in construction for construction, found a problem: hard disk video recorder and keyboard control through the same 485 bus to control yuntai, due to the hard disk video recorder and control keyboard 485 data communication line out