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NEMA ANSI C12.18:2006
Protocol specification for ansi type 2 optical port
Details the criteria required for communications between a C12.18 device and a C12.18 client via an optical port. The C12.18 client may be a handheld reader, a portable computer, a master station system, or some other electronic communications device.
NEMA: National Electrical Manufacturers Association [nema]