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IntelliBox-I/O 2100 User Guide
172
Overview
When it comes to planning data communication for open, multi-vendor industrial control
systems, Modbus is the first choice of end users and integrators alike. The Modbus/RTU
protocol defines how a master device polls one or more slave devices to read and write
data in real time by means of RS232, RS422, or RS485 serial data communication.
Although not the most powerful protocol available, its rare simplicity allows not only rapid
implementation but also enough flexibility to apply in virtually all industrial situations.
Modbus/TCP, an extension of Modbus/RTU, defines how Modbus/RTU and
Modbus/ASCII encode and transport messages over TCP/IP-based networks.
Modbus/TCP is just as simple to implement and as flexible to apply as the original
Modbus/RTU. You can find the specifications for both online at
www.Modbus.org
.
The IntelliBox enables users to integrate new and existing Modbus/RTU and
Modbus/ASCII serial devices with newer TCP/IP network-based devices. This appendix
describes a system that integrates three Modbus/RTU slave devices with four
Modbus/TCP devices.
Table C-1 Extended Modbus System Example
C: Modbus
Modbus/TCP over Ethernet, Token Ring, Routers, WAN, etc.
IntelliBox-I/O 2100
B
A
C
D
E
IntelliBox-I/O 2100
F G
RS-485
RS-232
RS-422
Summary of Contents for I/O 2100
Page 1: ...Part Number 900 474 Revision B March 2012 IntelliBox I O 2100 User Guide ...
Page 36: ...5 Getting Started IntelliBox I O 2100 User Guide 36 Figure 5 1 Lantronix DeviceInstaller ...
Page 86: ...9 Services Settings IntelliBox I O 2100 User Guide 86 Figure 9 7 HTTP Configuration Page ...
Page 95: ...10 Security Settings IntelliBox I O 2100 User Guide 95 Figure 10 1 SSH Server Host Keys Page ...
Page 123: ...12 Advanced Settings IntelliBox I O 2100 User Guide 123 Figure 12 3 Email Configuration Page ...