Title: Hardware Installation Guide.pdf
[J1] RS-485 termination. Install in first and last units only. OFF: Termination is not on ON: Termination is on[J3] 2-wire select: install in 2W position only.J 3The (EIA) Electronic Industries Association standard defines RS-485 as an electrical interface for multi-port communications on a bus transmission line. It allows for high-speed data transfer over extended distances (4000 feet/1219 m). The RS-485 interface uses a balance of differential transmitter/receiver to reject common mode noise. For increased reliability over the extended distances, End-Of-Line (EOL) termination is required.RS-485 (2-wire or 4-wire) must be terminated at both ends of the RS-485 line (bus). Terminating the line provides a more reliable communication by minimizing the signal reflection and external noise coupling. Each component provided has on-board terminators. The installer should determine which devices are at the end of the communication line.revision 6 — 301LNL-1200 Output Control Module