Introduction to Modbus to Ethernet Device Servers and Modbus TCP to RTU Gateways

Introduction to Modbus to Ethernet Device Servers and Modbus TCP to RTU Gateways

ICP DAS USA, [email protected] 1-888-871-9888www.icpdas-usa.com

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Earthquake Early Warning Technology| Maria Lemone | 5/15/15

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ICP DAS tDS-700 Serial to Ethernet Device Servers


Modbus Device Servers | Maria Lemone | 5/15/15

The TDS-700 series are Serial-to-Ethernet Device Servers that add Ethernet and Internet connectivity to any RS-232 and RS-422/485 device. Virtual COM ports are set up with he VxComm Driver/Utility so the built-in COM port of the TDS-700 series can be virtualized to a standard PC COM port in Windows. The TDS-700 device servers can be used to create a pair-connection application (as well as a serial-bridge or serial-tunnel), and then route data over TCP/IP between two serial devices. It's useful when connecting to mainframe computers, servers or other serial devices that do not themselves have Ethernet capability.

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tDS-700 Serial to Ethernet Device Servers



The tDS-715 is a Serial-to-Ethernet device server designed to add Ethernet and Internet connectivity capabilities to any RS-485/RS-422 devices, and to eliminate cable length limitation of traditional serial communication. By using the VxComm Driver/Utility, the built-in COM port of the tDS-715 RS-485/RS-422 to Ethernet device server can be virtualized to a standard PC COM port in Windows. Therefore, users can access or monitor serial devices over Internet/Ethernet without software modification.• Enable any RS-485/RS-422 serial devices with Ethernet

capabilities • VxComm Driver for 32-bit and 64-bit Windows

XP/2003/2008/Vista/7 • Supports pair-connection (serial-bridge, serial-tunnel)

application • Powerful 32-bit MCU handles efficient network

trafficking Click here to learn more…

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ICP DAS tGW-700 Modbus TCP to RTU/ASCII Device Servers


The tGW-700 series are Modbus TCP to RTU/ASCII Device Servers that enable a Modbus/TCP host to communicate with serial Modbus RTU/ASCII devices through Ethernet networks. They eliminates the cable length limitation of legacy serial communication devices. The tGW-7000 serial device servers can be used to create a pair-connection application (as well as a serial-bridge or serial-tunnel application), and can then route data over TCP/IP between two serial Modbus RTU/ASCII devices; which is useful when connecting to mainframe computers, servers or other serial devices that use Modbus RTU/ASCII protocols and do not themselves have Ethernet capability.

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tGW-700 Modbus TCP to RTU/ASCII Device Servers



The tGW-715 is a Modbus TCP to RTU/ASCII gateway that enables a Modbus/TCP host to communicate with serial Modbus RTU/ASCII devices through an Ethernet network, and eliminates the cable length limitation of legacy serial communication devices. The module can be used to create a pair-connection application (as well as serial-bridge or serial-tunnel application), and can then route data over TCP/IP 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.• Cost-effective Modbus/TCP to RTU/ASCII Gateway• Supports Modbus/TCP master and slave• Supports Modbus RTU/ASCII master and slave• Contains a 32-bit MCU that efficiently handles network traffic• 10/100 Base-TX Ethernet, RJ-45 x 1• Supports TCP, UDP, HTTP, DHCP, BOOTP and TFTP protocols

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Features Comparison

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Features\ Series PPDS PDS DS tDS tGW

Virtual COM Yes Yes Yes Yes -

Programmable Yes Yes - - -

PoE Yes - - Yes Yes

Modbus Gateway Yes - - - Yes

Multi-client Yes Yes Yes - -

Remarks Isolation for DS-715

Cost-effective

Cost-effective





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Specifications ComparisonI-7188EN PDS-700 tDS-700 tGW-700

OS MiniOS7 MiniOS7 ---

CPU 80188-40 MHz 80186-80 MHz 32-bit MCU 50MHz

Ethernet 10 Mbps 10/100 Mbps 10/100 Mbps

EEPROM 2 KB 16 KB ---

Frame Ground --- Yes Yes

Total Models 8 10+ 7+

Models with DI/DO 2 5 0

Virtual COM Yes Yes Yes ---

Virtual I/O --- Yes ---



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• tDS/tGW-700 Common Features • Tiny Device Server

– tDS-700: Tiny Device Servers

• Tiny Modbus Gateway– tGW-700: Tiny Modbus



Learn more…

Learn more…



tDS/tGW-700 Common Features

• Contains a 32-bit MCU that efficiently handles network traffic• 10/100 Base-TX Ethernet, RJ-45 x1 (Auto-negotiating, auto MDI/MDIX, LED

Indicators)• Includes redundant power inputs: PoE and DC jack• Supports TCP, UDP, HTTP, DHCP, BOOTP and TFTP protocols• Supports UDP responder for device discovery• Allows automatically RS-485 direction control• Supports pair-connection applications• Allows easy firmware updates via the Ethernet• Contains a tiny Web server for configuration• Tiny form-factor and low power consumption• RoHS compliant and no Halogen• Made from fire retardant materials (UL94-V0 Level)



Redundant Power Inputs

• PoE ◆DC Jack• (IEEE 802.3af, Class 1) (+12 ~

48 VDC )



Automatic MDI / MDI-X crossoverMaking Data Acquisition Easy


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tDS-700 / tGW-700 Naming Conventions

tDS-7 X Y tGW-7 X YX: Number of Total Ports

Y: Serial Ports Type 2: RS-2324: RS-485 and RS-2325: RS-422 / RS-4858: RS-232 / 422 / 485



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tDS-700 (tGW-700) Selection Guide

tDS-712tGW-712

tDS-722 tGW-722

tDS-732tGW-732

tDS-715tGW-715

tDS-725tGW-725

tDS-735tGW-735

tDS-718tGW-718

COM1

5-wire RS-232

5-wire RS-232

3-wire RS-232

2-wire RS-4854-wire RS-422

2-wire RS-485

2-wire RS-485

3-wire RS-232

2-wire RS-4854-wire RS-422

COM2

5-wire RS-232

3-wire RS-232

2-wire RS-485

2-wire RS-485

COM3

3-wire RS-232

2-wire RS-485

We are planning to have two new models as follows:tDS-724 (tGW-724) : RS-485 x1, RS-232 x1 (5-wire)tDS-734 (tGW-734) : RS-485 x1, RS-232 x2 (3-wire)



UDP Search• Use "eSearch Utility“ or “VxComm Utility”,

you can find the module quickly and configure the proper network settings.



Init Switch

Mode Flash Protection Firmware Update Configuration

Initial No Yes Factory

Run Yes No User-Defined

If there are something wrong in network settings or other settings accidentally, you can make the switch is placed in the “Init mode”. After re-booting, all values can be restored to factory settings.



16

Firmware Update (1/2)• Connect the tGW-700 to the same HUB or same sub-network as your PC. (For tDS-

700, tGW-700, PETL-7000 and tPET Series)

• Right-click above the module name and choose the firmware file in “eSearch Utility”.

• Power-on reboot the module in initial mode to request the update.




Firmware Update (2/2)

• The tGW-700 has a built-in feature of flash protection that prohibits modification to the firmware in the flash. Before updating the firmware, we have to set “Init Switch” in “Init” state and then power-on reboot the tGW-700 and disable the flash protection. Since the flash becomes writable, we can update the firmware through the Ethernet network 。

• The code (in the boot loader) used to update the firmware image is not part of the firmware it-self. Thus, users can update the firmware even the built-in one is broken or does not exist. If the firmware update fails, we just need to rerun the update procedures again.




tDS-700 Features• Incorporates any RS-232/422/485 serial device in Ethernet• Supports pair-connection (serial-bridge, serial-tunnel) applications• Male DB-9 or terminal block connector for easy wiring• Allows easy firmware updates via the Ethernet• Contains a tiny Web server for configuration• Cost-effective Device Servers

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Virtual COM Basis

Meter

PLC10/100 M Ethernet

RS-485

VCOM6/7 VCOM6/7

Transparent

tDS-725

Command/Data/Modbus/Anything Command/Data/Modbus/Anything

Note: 1. In the virtual COM application, the command or data is being copied between the

PC and tDS-700 module with no protocol convert. This allows most of the serial protocols can be used with the virtual COM.

Transparent (with no protocol convert)

MeterPLC

RS-485



Virtual COM Application

RFID Reader

Meter

NS-208PSEEthernet Switch with PoE

MeterPLC

10/100 M Ethernet

RS-232

RS-485

RS-485

RS-485

VCOM5VCOM6VCOM7VCOM8…

VCOM5

VCOM6

VCOM7

VCOM8

tDS-712

tDS-715

tDS-725

VxComm Driver

PLC

Note: 1. The max. COM port number in a PC is up to COM256.2. The COM port is configured and mapped by using the VxComm Utility.



Direct TCP Socket Connection

Meter


RS-485

tDS-725

Send raw data via TCP socket. Raw data

Note: 1. The serial ports of the tDS-700 can be also accessed via TCP socket connections.

TCP port 10001 = COM1, TCP port 10002 = COM2, TCP port 10003 = COM3.2. Users have to configure the baud rate and data format via web configuration first,

else the serial ports may send garbage data.

Transparent (with no protocol convert)

MeterPLC

RS-485

Port 10001 (COM1)Port 10002 (COM2)



Serial Port Pair-connection Basis

PLC 2 uses 115200 bps

tDS-715 uses 115200 bps


Serial Port Pair-connectionThrough the Ethernet

Port 1(RS-485)


Port 1(RS-485)

Note: 1. PLC 1 and PLC 2 can communicate with each other via the RS-485 port that

has pair-connection link through the Ethernet.

Virtual RS-485 bus through the pair-connection.



Pair-connection with Different Baud Rate





Port 1(RS-485)

PLC 1 uses 9600 bps

Port 1(RS-485)

Note: 1. PLC 1 and PLC 2 can use different baud rate and different data format at the same time

when using pair-connection. But please make sure that the tDS-700 has the same setting as local serial devices.

2. The pair-connection can be created by using same or different tDS-700 models.The pair-connection is working as port-to-port.




Virtual RS-485 Network (base on pair-connection)

PLC

Meter

RS-485

tDS-715

tDS-725

tDS-725Meter

tDS-725

tDS-735RS-485



Port 1

Port 2

Port 1

Port 2 (RS-485)

Port 1(RS-485)

Port 1

Port 1 (RS-485)

Port 2

Port 2 (RS-485)


PLC

Note: When connecting several tDS-700 (RS-485 master) in RS-485 network, you should remove the pull-high/low resister in most of the tDS-700 modules, and make sure there is only one master in the RS-485 network.

Port 3



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tDS-700 Web Configuration : Login

Default Settings:Item Factory Default Settings

IP 192.168.255.1

Gateway 192.168.0.1

Mask 255.255.0.0

Password Admin



26

tDS-700 Web Configuration : Home PageMaking Data Acquisition Easy


27

tDS-700 Web Configuration : Network SettingMaking Data Acquisition Easy


28

tDS-700 Web Configuration : Port SettingMaking Data Acquisition Easy


tDS-700 Web Configuration : IP Filter Making Data Acquisition Easy


30

• tDS/tGW-700 Common Features

• Tiny Device Server– tDS-700: Tiny Device Servers

• Tiny Modbus Gateway– tGW-700: Tiny Modbus Gateway



tGW-700 Features

• Cost-effective Modbus/TCP to RTU/ASCII Gateway• Supports Modbus/TCP master and slave• Supports Modbus RTU/ASCII master and slave• Supports pair-connection (serial-bridge, serial-tunnel) applications• Tiny form-factor and low power consumption



Learn More…


Modbus Gateway Basis

Meter


RS-485

tGW-725

Modbus/TCPModbus RTU or Modbus ASCII

Note: 1. The tGW-700 act as Modbus/TCP to Modbus RTU/ASCII converter. The

client program must use Modbus/TCP protocol. 2. The Modbus RTU or ASCII protocol, baud rate and data format used are

depending on the serial devices, and are setting via web configuration.

Port 502 (COM1)

Meter

PLCRS-485

Port 503 (COM2)



Modbus Gateway Application

RFID Reader

Meter

NS-208PSEEthernet Switch with PoE

MeterPLC

MeterPLC

10/100 M Ethernet

RS-232

RS-485

RS-485

RS-485

Port 502

Port 502

Port 502Port 503

tGW-712 with Modbus RTU

tGW-715 with Modbus ASCII

tGW-725

PLC

Modbus/TCP Modbus RTU or ASCII

Note: 1. The default TCP ports used in tGW-700 are 502 (COM1), 503 (COM2) and 504

(COM3). These TCP ports can be changed via the web configuration.



Serial Port Pair-connection Basis

PLC 2 uses 115200 bps and Modbus RTU

tGW-715 uses 115200 bps and Modbus RTU

tGW-715 uses 115200 bps and Modbus RTU


Port 1(RS-485)


Port 1(RS-485)

Note: 1. PLC 1 and PLC 2 can communicate with each other via the RS-485 port that

has pair-connection link through the Ethernet.




Pair-connection with Different Protocols

PLC 2 uses 115200 bps and Modbus ASCIItGW-715 uses

115200 bps and Modbus ASCIItGW-715 uses 9600 bps and Modbus RTU


Port 1(RS-485)


Port 1(RS-485)

Note: 1. PLC 1 and PLC 2 can use different protocol (RTU or ASCII), baud rate and

data format at the same time when using pair-connection. But please make sure that the tGW-700 has the same setting as local serial devices.

2. The pair-connection can be created by using same or different tGW-700 models.The pair-connection is working as port-to-port.

Virtual RS-485 bus through the pair-connection (with Modbus RTU to ASCII converter ).



Virtual RS-485 Network (base on pair-connection)

PLC

Meter

RS-485

tGW-715 with Modbus ASCII

tGW-725With Modbus RTU

tGW-725

Meter

tGW-725

tGW-735

RS-485 with Modbus RTU/ASCII(Single Protocol)



Port 1

Port 2

Port 1

Port 2 (RS-485)

Port 1(RS-485)

Port 1

Port 1 (RS-485)

Port 2

Port 2 (RS-485)


PLC

Note: When connecting several tGW-700 (RS-485 master) in RS-485 network, you should remove the pull-high/low resister in most of the tGW-700 modules, and make sure there is only one master in the RS-485 network.

Port 3



tGW-700 Web Configuration : Network Setting



tGW-700 Web Configuration : Port Setting

38



Application : Pair Connection




ICP DAS USA• ICP DAS was established in 1993• Headquartered in Hsinchu, Taiwan• ICP DAS USA was launched in 2001• Making Data Acquisition Easy

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Demo & Contact Information


• Contact us:Tel: (310) 517-9888 x105 (888) 971-9888Website: www.icpdas-usa.comEmail: [email protected] Follow ICP DAS USA On:


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Date post:	27-Jul-2015
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