Title: Hardware Installation Guide.pdf
For RS-485 communication, the following type of RS-485 cable is required: 24 AWG (minimum) twisted pair (with shields.) Either 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 maximum (Belden 9842 4-wire or 9841 2-wire, plenum cabling Belden 88102, West Penn, or equivalent.) The drop cables (to readers and other devices) should be kept as short as possible, no longer than 10 feet.RS-232 Communications