WEG CFW100 User Manual - page 7
Interface Description
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)
Figure 2.1: Module with RS485 interface
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
1
connector.
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:
Table 2.1: RS485 connector pinout for the module (CFW100-CRS485)
Pin
Name
Description
7
RS485 - B
RS485 (Terminal B)
6
RS485 - A
RS485 (Terminal A)
8
0 V
Reference 0 V
9
PE
Grounding connection
10
-
---------------------
Table 2.2: Configuration of the switches to configure the RS485
Switch Setting
Option
S1.1 = OFF e S1.2 = OFF
RS485 Termination off
S1.1 = ON e S1.2 = ON
RS485 Termination on
S1.1 = OFF e S1.2 = ON
This combination is not
allowed
S1.1 = ON e S1.2 = OFF
S1.1 = ON e S1.2 = OFF
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.
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