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RS-422
RS-422, also known as TIA/EIA-422, is a technical standard originated by the Electronic Industries Alliance, first issued in 1975, that specifies electrical characteristics of a digital signaling circuit. Wikipedia
Connector types: Not specified
Mark(1): Negative difference
Maximum binary rate: 100 kbit/s – 10 Mbit/s
Maximum devices: 10 (1 driver and 10 receivers)
Maximum distance: 1,200 meters (3,900 ft)