Interface Description; Rs485 Communication Module (Cfw100-Crs485); Rs485 Module's Connector; Rs485 Interface Characteristics - WEG CFW100 User Manual

2 INTERFACE DESCRIPTION

The interfaces for serial communication RS485 or USB available for the CFW100 frequency inverter depend on
the selected communication module for the product. Following are presented information about the connection
and installation of the equipment, using different communication modules.
2.1

RS485 COMMUNICATION MODULE (CFW100-CRS485)

This plug-in module for the CFW100 frequency inverter has one RS485 interface. This standard RS485 interface
has two functions:
Point to Point Connection with remote keypad, via mini USB

Connection via RS485 for network operation, via terminals.

NOTE!
Although RS485 communication signal is available on both connectors – mini USB and control
terminal – these signals are the same (internally). For this reason, it is not possible to use RS485
interface as command source or reference source and remote keypad at the same time.
2.1.1

RS485 module's connector

The RS485 interface connections are available via control terminal using the following pin assignment:
2.1.2

RS485 Interface Characteristics

The interface follows the EIA/TIA-485 standard.

It allows communication baud rates from 9600 up to 38400 Kbit/s.

The interface is electrically isolated and with differential signal, which grants more robustness against

electromagnetic interference.
It allows the connection of up to 32 devices to the same segment. More devices can be connected by using

repeaters .
2
A maximum bus length of 1000 meters.

1
For connections that require distances greater than 3 meters, use remote keypad connection via control terminal.
2 The limit of devices that can be connected on the network depends on the protocol used.
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.ctiautomation.net - Email: info@ctiautomation.net
Figure 2.1: Module with RS485 interface
Table 2.1: RS485 connector pinout for the module (CFW100-CRS485)
Pin Name
7 RS485 - B
6 RS485 - A
8 0 V
9 PE
10 -
Table 2.2: Configuration of the switches to configure the RS485
Switch Setting
S1.1 = OFF e S1.2 = OFF
S1.1 = ON e S1.2 = ON
S1.1 = OFF e S1.2 = ON
S1.1 = ON e S1.2 = OFF
S1.1 = ON e S1.2 = OFF
1 connector.
Description
RS485 (Terminal B)
RS485 (Terminal A)
Reference 0 V
Grounding connection
---------------------
Option
RS485 Termination off
RS485 Termination on
This combination is not
allowed
Interface Description