RS-485
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RS-485, also known as TIA-485 or EIA-485, is a standard, originally introduced in 1983, defining the electrical characteristics of drivers and receivers for use in serial communications systems. Electrical signaling is balanced, and multipoint... Wikipedia
Data rate: 10Mbps
Available signals: A, B, C
Connector types: Not specified
Maximum devices: At least 32 unit loads
Mode of operation: Different receiver levels: binary 1 (OFF); (Voa–Vob < −200 mV); binary 0 (ON); (Voa–Vob > +200 mV)
Network topology: Point-to-point, multi-dropped, multi-point
Physical media: Balanced interconnecting cable