User's Manual

COBALT UHF-SERIES CHAPTER 7: MODBUS TCP INTERFACE
PAGE 112 OF 140
CHAPTER 7:
MODBUS TCP INTERFACE
One of the most popular and well-proven industrial automation protocols in use today
is Modbus®. Modbus is an open client/server application protocol. Modbus TCP
allows the Modbus protocol to be carried over standard Ethernet networks. Modbus
TCP is managed by the Modbus-IDA User Organization.
7.1 MODBUS TCP OVERVIEW
Under the MODBUS® TCP protocol, the Cobalt acts as a Modbus Server and the
PLC acts as a Modbus Client. By utilizing Produce and Consume registers for
mapping commands and responses, data produced by the Cobalt is consumed by
the Modbus Client and data produced by the Modbus Client is consumed by the
Cobalt.
ATTENTION:
• Modbus Client (Host or PLC) must connect to the Modbus Server (Cobalt) on port
50200
• Maximum number of words transferred to/from an RFID tag per read/write cycle: 100
Words / 200 Bytes
• Disable any firewall services running on the PC. Firewalls can potentially block
communications between the Cobalt and the host and/or PLC
7.2 MODBUS TCP CONFIGURATION VIA HTML S ERVER
To configure the Cobalt for Modbus TCP communications, begin by assigning the
controller a locally compatible IP address.
Through a standard Web browser, you can utilize the Cobalt’s HTML Server to
access an embedded suite of controller configuration tools, called the “OnDemand
Utilities.” Among its features is the ability to modify and save changes to the
controller’s IP address, which is stored internally on the Cobalt.
Cobalt Industrial Ethernet RFID Controller - Default IP Address:
192.168.253.110
7.2.1 Setting the IP Address of the Cobalt
To set the Cobalt’s IP address using the HTML Server, follow the steps below:
1.
Open a Web browser on the host.
2.
In the URL address field, enter the Cobalt’s IP address (192.168.253.110 =
factory default)
.
3.
Press
ENTER
.
The HTML Server - Main Page will be displayed.