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OM-S01 to achieve all the way RS-232 or RS-485 or RS-422 through a pair of optical fiber on the long-distance transmission, the product has a RS-485/422 interface supporting multi-machine communications, networking easy points. At the same time, due to use of optical fiber as the transmission medium, with high isolation voltage, anti-electromagnetic interference, anti-lightning strike and so on. 232/485 fiber optic converter is widely used in various industrial control, distributed data acquisition and so on, particularly suitable for power system automation, traffic control and other departments.