Single-fiber dual-optical interface RS485/422/232 multi-mode optical link module. 1-electric and 2-optical; Single-fiber transmission; Achieve high-speed long-distance transmission of RS485/422/232 signal; Completely solve the engineering problems such as electromagnetic interference, ground loop interference and lightning damage in communication; Realize point-to-point, bus, star and hybrid optical networks. Transparent data transmission; No need to change the original communication protocol and software; Rate: 0-500Kbps, self-adaptive; 9-40VDC wide voltage isolated power supply; Applicable optical fiber: multi-mode 62.5/125um and 50/125um; Optical fiber transmission distance: 0-2km; ST optical fibre splice; -40-+85℃ industrial grade working temperature; DIN35mm standard lead rail mounting.