Johnson Controls S300 Series - RS485 Connection; Setting the End-of-Line Switch (SW1)

To Next Page

To Previous Page

Hardware Installation S300-DIN-RDR2S Module

24 24-10239-413 Rev. A

This document contains confidential and proprietary information of Johnson Controls, Inc.

RS485 Connection

Setting the End-of-Line Switch (SW1)

Network devices at either end of the RS485 network must be set as network

terminated devices. This is done with the use of the End-of-Line (EOL) switch. The

S300-DIN-RDR2S module has one End-of-Line switch consisting of two resistors.

Turn them both on (up) or both off (down) according to the position of the RDR2S

module on the RS485 bus.

Factory Default: ON (both up)

EOL Switch

NOTE

Before changing the EOL position, remove the 24 VDC supply power to

the RDR2S and wait for the Power LED to go off.

Other manuals for Johnson Controls S300 Series