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Tiny Modbus/TCP to RTU/ASCII Gateway

1. Introduction

Modbus has become the de facto standard protocol for industrial communication, and is now the

most commonly available means of connecting industrial electronic devices. Modbus allows for

communication between many devices connected to the same RS-485 network, for example, a

system that measures temperature and humidity and communicates the results to a computer.

Modbus is often used to connect a supervisory computer with a remote terminal unit (RTU) in

supervisory control and data acquisition (SCADA) systems.

The tGW-700/GW-2200 module is a Modbus TCP/UDP to RTU/ASCII gateway that enables a Modbus

TCP/UDP host to communicate with serial Modbus RTU/ASCII devices through an Ethernet network,

and eliminates the inherent cable length limitations of legacy serial communication devices. The

module can be used to create

pair-connection applications (as well as

serial-bridge or serial-tunnel applications),

and can then route data over a TCP/IP

connection between two serial Modbus

RTU/ASCII devices, which is useful when

connecting mainframe computers, servers

or other serial devices that use Modbus

RTU/ASCII protocols and do not themselves

have Ethernet capability. And the

tGW-700/GW-2200 adopts the dual-stack

technology to support the IPv4 and IPv6

simultaneously (version 2.2.0 or later).

ICP DAS USA tGw-735 User Manual

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