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ICP DAS USA tGw-735 User Manual

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Tiny Modbus/TCP to RTU/ASCII Gateway
Copyright © 2020 ICP DAS CO., Ltd. All Rights Reserved. - 89 -
7. Modbus Information
What is Modbus TCP/IP?
Modbus is a communication protocol developed by Modicon in 1979. You can also visit
http://www.modbus.org to find more valuable information.
The Different versions of Modbus used today include Modbus RTU (based on serial communication
interfaces such as RS485 and RS232), Modbus ASCII and Modbus TCP, which is the Modbus RTU
protocol embedded into TCP packets.
Modbus TCP is an internet protocol. The protocol embeds a Modbus frame into a TCP frame so that
a connection oriented approach is obtained, thereby making it reliable. The master queries the
slave and the slave responds with the reply. The protocol is open and, hence, highly scalable.
7.1 Modbus Message Structure
Modbus devices communicate using a master-slave (client-server) technique in which only one
device (the master/client) can initiate transactions (called queries). The other devices
(slaves/servers) respond by supplying the requested data to the master, or by taking the action
requested in the query.
A query from a master will consist of a slave address (or broadcast address), a function code
defining the requested action, any required data, and an error checking field. A response from a
slave consists of fields confirming the action taken, any data to be returned, and an error checking
field.
Modbus/TCP Message Structure
Byte 00~05
Byte 06~11
6-byte header
RTU Data

Table of Contents

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ICP DAS USA tGw-735 Specifications

General IconGeneral
ModeltGw-735
CategoryControl Unit
ManufacturerICP DAS USA
Ethernet10/100 Base-TX
Serial Ports1
Operating Temperature-25 ~ +75 °C
Ethernet Ports1
Storage Temperature-30 ~ +80 °C
Power Input10 ~ 30 VDC
ProtocolsModbus TCP, Modbus RTU
Power SupplyDC 10~30V
Operating VoltageDC 10 ~ 30V
Humidity10 ~ 90% RH, non-condensing

Summary

Packing List

More Information

Documentation

Links to download manuals for tGW-700, tGW-700-T, and GW-2200 series.

Firmware

Provides links to download firmware updates for the gateway modules.

Software

Links to download necessary software utilities for the gateways.

1. Introduction

1.1 Features

Lists key capabilities and specifications of the gateway modules.

1.2 Applications

Outlines common use cases and industries for the gateway.

1.3 Ethernet Solutions

Explains the role and benefits of Ethernet in industrial communication.

1.4 Web Server Technology

Describes the web-based interface for device configuration and management.

2. Hardware Information

2.1 Specifications

Details technical specifications like CPU, Ethernet, PoE, COM ports, and environment.

2.2 Appearance

Illustrates the physical layout and components of the tGW-700 and GW-2200 series.

2.3 Dimensions

Provides detailed physical measurements for various module models.

2.4 Pin Assignments

Maps terminal numbers to specific signal assignments for different serial ports.

2.5 Wiring Notes for RS-232/485/422 Interfaces

Offers guidance on correctly connecting serial communication interfaces.

3. Getting Started for tGW-700 / GW-2200 Series using IPv4

3.1 Connecting the Power and Host PC

Covers initial setup steps for power and network connection.

3.2 Configuring Network Settings

Guides users through setting up IP addresses, subnet masks, and gateways.

3.3 Connecting the Modbus Devices

Explains how to connect serial Modbus devices to the gateway.

3.4 Configuring the Serial Port

Details the process of setting up serial port parameters via the web interface.

3.5 Self-Test

Describes a procedure to verify the correct operation of the gateway.

4. Getting Started for tGW-700 / GW-2200 Series using IPv6

4.1 Connecting the Power and Host PC

Covers initial setup steps for power and network connection using IPv6.

4.2 Configuring Network Settings

Guides users through setting up IPv6 network configurations.

4.3 Connecting the Modbus Devices

Explains how to connect serial Modbus devices for IPv6 configurations.

4.4 Configuring the Serial Port

Details setting up serial port parameters via the web interface for IPv6.

4.5 Self-Test

Describes a procedure to verify the correct operation using IPv6.

5. Web Configuration

5.1 Logging in to the tGW-700/GW-2200 Web Server

Provides steps to access and log into the device's web interface.

5.2 Home Page

Describes the main dashboard displaying hardware and software information.

5.3 Network Page

Covers network settings like IP address, subnet mask, and gateway configuration.

5.3.1 IP Address Selection

Explains static and dynamic IP configuration options for IPv4 and IPv6.

5.3.2 General Settings

Details parameters like Ethernet speed, HTTP port, alias, and timeouts.

5.3.3 Modbus Settings

Configures Modbus-specific parameters like exceptions and timeouts.

5.3.4 Restore Factory Defaults

Outlines the process to reset all device settings to their original factory defaults.

5.3.5 Update by Ethernet

Explains how to update the device firmware remotely via Ethernet.

5.4 Serial Port Page

Manages serial port settings such as baud rate, data format, and protocol.

5.4.1 Settings (Port1 Settings)

Configures specific parameters for the serial port, including interface and Modbus settings.

5.4.2 Settings (Pair-Connection Settings)

Sets up parameters for master/slave or client/server communication modes.

5.5 Filter Page

Allows configuration of an IP filter list to restrict access to the device.

5.6 Monitor Page

Displays the current status and statistics of serial port connections.

5.7 Password Page

Enables changing the login password for the web interface.

5.8 Logout Page

Describes the process of logging out from the web interface.

6. Typical Applications

6.1 Modbus Gateway

Illustrates the use of the module as a gateway between Modbus TCP and RTU/ASCII.

6.2 Modbus Net ID

Explains how to use Net IDs for accessing slave devices via the gateway.

6.3 Pair-connection Applications

Demonstrates creating serial-to-serial connections over Ethernet.

6.4 TCP Client Mode Applications

Shows how the device acts as a TCP client to connect to Modbus TCP slave devices.

7. Modbus Information

7.1 Modbus Message Structure

Details the byte-level structure of Modbus TCP and RTU messages.

7.2 Exception Codes

Lists and explains Modbus exception codes that may be returned by the device.

Appendix A: Troubleshooting

A1. How do I restore the web password for the module to the factory default password?

Provides step-by-step instructions to reset the web password to factory defaults.

Appendix B: Glossary

1. ARP (Address Resolution Protocol)

Defines the Address Resolution Protocol and its function in network communication.

2. Clients and Servers

Explains the client-server paradigm in network applications.

3. Ethernet

Provides a definition of the Ethernet networking technology.

4. Firmware

Defines firmware and its role in device operation and updates.

5. Gateway

Explains the function of gateways in interconnecting networks.

Appendix C: Actual Baud Rate Measurement

Appendix D: Revision History

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