Title: Hardware Installation Guide.pdf
RS-485 communication requires a 24 AWG (minimum) twisted pair (with shields) cable. Either a 2-wire or 4-wire RS-485 cable configuration can be used. The RS-485 cable should be no longer than 4000 feet (1219 m), 100 ohms minimum impedance (Belden 9842 4-wire or 9841 2-wire, plenum cabling Belden 88102, West Penn, or equivalent). Install a termination jumper only for end of line unit(s).When connecting to the host via RS-485 (2-wire or 4-wire), do not use the 115,200 baud rate because there is no hardware handshake capability. For reliable communication with this baud rate, CTS on the host must be connected to RTS on the controller; RS-485 communication does not provide this.