RS-485 wiring - Facility Explorer - LIT-12014353 - FX-SC9BASE-0 - FX90 Supervisory Controller - 14.x

FX90 Supervisory Controller Installation Guide

Product
Controls > Supervisory Controls > FX90 Supervisory Controller
Document type
Installation Guide
Document number
LIT-12014353
Version
14.x
Revision date
2024-03-18
Product status
Active

On the FX90 Supervisory Controller's top side, two RS-485 ports operate as COM1 and COM2. Each port is capable of up to 115,200 baud, and uses a 3-position, screw terminal connector.

Use shielded, twisted-pair, 18-22 AWG cabling to wire in a continuous daisy chain fashion to other RS-485 devices: minus-to-minus, plus-to-plus, and shield-to-shield. Connect the shield wire to earth ground at one end only.

For more information about wiring guidelines, refer to FX-PC Series Controllers MS/TP Communications Bus Technical Bulletin (LIT-12011670).

Figure 1. RS-485 wiring example

Callout

Description

1

RS-485 port A (COM1)

2

RS-485 port B (COM2)

3

A maximum of four total option modules are supported. The FX90 Supervisory Controller license determines the options available.