YOKOGAWA GX20 User Manual

4-1
IM 04L51B01-01EN
Using Modbus Functions (Communicating with Modbus devices)
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Index
4.1 UsingModbus/TCPtoEnableOtherDevicesto
Read Data from and Write Data to the GX/GP
(Modbusserverfunction)
The Modbus function is used by the GX/GP and external Modbus devices to perform
communication and data reading and writing.
The GX/GP can operate as a Modbus server. The maximum number of simultaneous
connections is 4.
Other devices (Modbus client devices) can carry out the following operations on the GX/GP.
• Read I/O channel and math channel (/MT option) data
• Read communication channel (/MC option) data
• Write data to communication channels
• Start and stop recording, write messages, and perform other operations
• Load the recording start/stop condition, message strings, and other types of data
Modbus client device
GX/GP
Modbus server
Ethernet
Command
Input register
Hold register
Read
Write
Read
3XXXXX
4XXXXX
Write
Read
Read
GX/GP internal register
Client
4.1.1 SettingBasicNetworkCommunicationConditions
Description
• ObtaintheIPaddressautomatically
• SettheIPaddressmanually(whenautomaticIPaddressassignmentisset
toOff)
For details on the settings, see page 1-180 in section 1.21.1, “Setting Basic Communication
Conditions”.
4.1.2 Configuring the Modbus Server Function
Description
EnablingtheModbusServerFunction
For details on the settings, see page 1-194 in section 1.21.9, “Setting the Server Functions
to Use (FTP, HTTP, SNTP, MODBUS, GENE, DARWIN compatible communication)”.
Applying Modbus Connection Limits
Set this function to limit the IP addresses that can connect to the GX/GP Modbus server
function.
You can register up to 10 IP addresses.
For details on the settings, see page 1-193 in section 1.21.8, “Limiting the Connection to
the Modbus Server (GX/GP)”.
Chapter 4 UsingModbusFunctions(CommunicatingwithModbusdevices)

YOKOGAWA GX20 Specifications

General

Brand	YOKOGAWA
Model	GX20
Category	Recording Equipment
Language	English