MODBUS Communication
2
TI 12A01F01-62EN
This document describes MODBUS communication by the FLXA402 4-Wire Converter.
Before communicating using the MODBUS protocol, refer to the User’s Manual of the FLXA402
4-Wire Converter (IM 12A01F031-03EN Operation of converter) for details of the parameters.
For latest User’s Manual, download it from our website or scan QR code.
http://www.yokogawa.com/an/xa402/download/
1. General
FLXA402 configures or obtains process data by using MODBUS/TCP protocol on physical
application: Ethernet, RS485.
MODBUS RTU is supported but not ASII.
1.1 MODBUS setup
l Ethernet
FLXA402 uses Modbus/TCP, connection port 502.
For MODBUS/TCP, IP address, subnet mask, default gateway or DHCP should be set in
advance from HMI device.
The Ethernet conguration is reected onto the system, after FLXA402 reboots.
l RS485
FLXA402 communicates via RS485 MODBUS.
The following list shows the required setting by HMI to establish communication between a
master device and FLXA402 via RS485 MODBUS.
Converter address: 1 to 247 (initial value 1)
Transmission speed: 9600[bps], 38400[bps], 115200[bps]
Parity : Even, Odd, None
When Parity is Even or Odd, Stop bit is 1bit, when None, Stop bit is 2 bit.
Even or Odd is recommended for Parity.
Stop bit: 1 bit
Parity: Even
Mode: RTU
No. TI 12A01F01-62EN 2nd Edition: Apr. 2019 (YK)
All Rights Reserved. Copyright © 2018, Yokogawa Electric Corporation
Apr. 19, 2019-00
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