You can use the TB34—a DB9F-to-terminal-block adapter fromSealevel Systems—to connect RS-485 field wiring to the serial port on USBserial adapters, Ethernet serial servers, and other Sealevel RS-485 ...
The proper method of wiring an RS-485 network is described, with recommendations for twisted-pair cabling and correctly locating termination resistors. Received waveforms are shown for examples of ...