Chapter 1
1-2
Communications Methods
1-1 Overview of Communications Methods
■ Introduction
3G3JE Inverters with Communications (referred to as “Communications Models”) use communica-
tions to monitor set values and make settings. In addition, programs for communications are created
at the Inverter's host computer (e.g., a personal computer), and the host computer is used to read
and write data, send operation commands, and change the setup area. Therefore the description
provided here is from the viewpoint of the host computer.
CompoWay/F is OMRON's standard communications protocol for general serial communications.
This protocol uses a standard frame format, as well as commands conforming to the well-established
FINS* commands used for OMRON PLCs. This simplifies communications between the host com-
puter and components.
*FINS (Factory Interface Network Service)
The FINS protocol provides message communications between controllers in OMRON FA networks.
● The 3G3JE supports the following communications functions.
• Reading/writing parameters
• Operation commands
• Changing the setup area
■ Communications Specifications
Item Specifications Default
Transmission line connection Multidrop ---
Communications method RS-485 (2-wire, half-duplex) ---
Synchronization method Start-stop synchronization ---
Communications baud rate 2.4, 4.8, 9.6, or 19.2 kbps 9.6 kbps
Communications code ASCII ---
Communications data bits 7 or 8 bits 7 bits
Communications stop bits 1 or 2 bits 2 bits
Error detection Vertical parity (none, even, or odd)
and BCC (Block Check Character)
Even
Flow control --- ---
Interface RS-485 ---
Retry function --- ---
Communications buffer 40 bytes ---
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