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Device from the set above2pcsQuidoDuplex RS is a set of two I/O modules for RS485 line (two wires only) with a special firmware designed specificaly to transmit digital I/Os over RS485 line as an autonomous system - no PCs or PLCs needed. If one input is turned on, the corresponding output on the other unit is also turned on. Bi-directional.

Example of bi-directional I/Os over RS485 line.