ICP DAS USA tGW-700 Series User manual

tGW-700 Series
User Manual
Tiny Modbus/TCP to RTU/ASCII Gateway Ver. 2.2, Nov. 2017
W
ARRANTY
All products manufactured by ICP DAS are warranted
against defective materials for a period of one year
from the date of delivery to the original purchaser.
WARNING
ICP DAS assumes no liability for damages consequent
to the use of this product. ICP DAS reserves the right to
change this manual at any time without notice. The
informat
ion furnished by ICP DAS is believed to be
accurate and reliable. However, no responsibility is
assumed by ICP DAS for its use, nor for any
infringements of patents or other rights of third parties
resulting from its use.
COPYRIGHT
Copyright © 2017 by ICP DAS. All rights are reserved.
TRADEMARKS
Names are used for identification purposes only and
may be registered trademarks of their respective
companies.
CONTACT US
If you have any questions, please feel free to contact
us via email at:
[email protected], service.[email protected]om
S
UPPORT
This manual relates to the following modules:
tGW-712, tGW-722, tGW-732
tGW-715, tGW-725, tGW735
tGW-718, tGW-724, tGW-734
tGW-712i, tGW-722i, tGW-732i
tGW-715i, tGW-725i, tGW735i
tGW-718i, tGW-724i, tGW-734i
tGW-718-D

Tiny Modbus/TCP to RTU/ASCII Gateway
Copyright © 2017 ICP DAS CO., Ltd. All Rights Reserved. - 2 -
TABLE OF CONTENTS
Packing List........................................................................................................................................ - 5 -
More Information ............................................................................................................................. - 5 -
1. Introduction .............................................................................................................................. - 6 -
1.1 Features ........................................................................................................................ - 8 -
1.2 Applications................................................................................................................... - 8 -
1.3 Ethernet Solutions ........................................................................................................ - 9 -
1.4 Web Server Technology .............................................................................................. - 10 -
2. Hardware Information ............................................................................................................ - 11 -
2.1 Specifications .............................................................................................................. - 11 -
2.2 Appearance ................................................................................................................. - 12 -
PoE and Ethernet RJ-45 Jack ........................................................................................... - 12 -
+12 to +48 VDC Jack........................................................................................................ - 12 -
Operating Mode Switch .................................................................................................. - 13 -
LED Indicator ................................................................................................................... - 13 -
Serial COM Ports ............................................................................................................. - 14 -
DIN-Rail Mounting .......................................................................................................... - 14 -
2.3 Dimensions.................................................................................................................. - 15 -
tGW-700 Series Module.................................................................................................. - 15 -
CA-002 Cable................................................................................................................... - 16 -
2.4 Pin Assignments.......................................................................................................... - 17 -
tGW-712/tGW-712i......................................................................................................... - 17 -
tGW-722/tGW-722i......................................................................................................... - 17 -
tGW-732/tGW-732i......................................................................................................... - 18 -
tGW-715/tGW-715i......................................................................................................... - 18 -
tGW-725/tGW-725i......................................................................................................... - 19 -
tGW-735/tGW-735i......................................................................................................... - 19 -
tGW-718/tGW-718i......................................................................................................... - 20 -
tGW-718-D ...................................................................................................................... - 20 -
tGW-724/tGW-724i......................................................................................................... - 21 -
tGW-734/tGW-734i......................................................................................................... - 21 -
2.5 Wiring Notes for RS-232/485/422 Interfaces ............................................................. - 22 -
RS-232 Wiring.................................................................................................................. - 22 -
RS-422 Wiring.................................................................................................................. - 23 -
RS-485 Wiring.................................................................................................................. - 23 -
3. Getting Started........................................................................................................................ - 24 -

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3.1 Connecting the Power and Host PC ............................................................................ - 24 -
3.2 Configuring Network Settings..................................................................................... - 25 -
3.3 Connecting the Modbus Devices ................................................................................ - 27 -
3.4 Configuring the Serial Port.......................................................................................... - 28 -
3.5 Self-Test ....................................................................................................................... - 30 -
4. Web Configuration.................................................................................................................. - 31 -
4.1 Logging in to the tGW-700 Web Server ...................................................................... - 31 -
4.2 Home Page .................................................................................................................. - 33 -
4.3 Network Page.............................................................................................................. - 34 -
4.3.1 IP Address Selection........................................................................................ - 34 -
4.3.2 General Settings.............................................................................................. - 37 -
4.3.3 Modbus Settings ............................................................................................. - 38 -
4.3.4 Restore Factory Defaults................................................................................. - 40 -
4.3.5 Update by Ethernet......................................................................................... - 42 -
4.4 Serial Port Page ........................................................................................................... - 43 -
4.4.1 Settings (Port1 Settings).................................................................................. - 43 -
4.4.2 Settings (Pair-Connection Settings) ................................................................ - 46 -
4.5 Filter Page ................................................................................................................... - 47 -
4.6 Monitor Page .............................................................................................................. - 48 -
4.7 Password Page ............................................................................................................ - 49 -
4.8 Logout Page................................................................................................................. - 50 -
5. Typical Applications................................................................................................................. - 51 -
5.1 Modbus Gateway ........................................................................................................ - 52 -
5.2 Modbus Net ID............................................................................................................ - 53 -
5.3 Pair-connection Applications ...................................................................................... - 54 -
5.4 TCP Client Mode Applications..................................................................................... - 62 -
6. Modbus Information............................................................................................................... - 67 -
6.1 Modbus Message Structure........................................................................................ - 67 -
01(0x01) Read the Status of the Coils (Readback DOs) ........................................................... - 70 -
02(0x02) Read the Status of the Input (Read DIs) .................................................................. - 71 -
03(0x03) Read the Holding Registers (Readback AOs) ............................................................ - 72 -
04(0x04) Read the Input Registers (Read AIs) ........................................................................ - 73 -
05(0x05) Force a Single Coil (Write DO) ................................................................................ - 74 -
06(0x06) Preset a Single Register (Write AO) ......................................................................... - 75 -
15(0x0F) Force Multiple Coils (Write DOs) ............................................................................ - 76 -
16(0x10) Preset Multiple Registers (Write AOs) ............................................................. - 77 -
Appendix A: Troubleshooting.......................................................................................................... - 78 -
A1. How do I restore the web password for the module to the factory default password?.. - 78 -

Tiny Modbus/TCP to RTU/ASCII Gateway
Copyright © 2017 ICP DAS CO., Ltd. All Rights Reserved. - 4 -
Appendix B: Glossary ...................................................................................................................... - 80 -
1. ARP (Address Resolution Protocol) ................................................................................. - 80 -
2. Clients and Servers.......................................................................................................... - 80 -
3. Ethernet .......................................................................................................................... - 81 -
4. Firmware ......................................................................................................................... - 81 -
5. Gateway .......................................................................................................................... - 81 -
6. ICMP (Internet Control Message Protocol)..................................................................... - 81 -
7. Internet ........................................................................................................................... - 81 -
8. IP (Internet Protocol) Address......................................................................................... - 82 -
9. MAC (Media Access Control) Address ............................................................................ - 82 -
10. Packet .......................................................................................................................... - 82 -
11. Ping.............................................................................................................................. - 82 -
12. RARP (Reverse Address Resolution Protocol) ............................................................. - 82 -
13. Socket .......................................................................................................................... - 83 -
14. Subnet Mask ............................................................................................................... - 83 -
15. TCP (Transmission Control Protocol)........................................................................... - 83 -
16. TCP/IP .......................................................................................................................... - 83 -
17. UDP (User Datagram Protocol) ................................................................................... - 83 -
Appendix C: Actual Baud Rate Measurement................................................................................. - 84 -
Appendix D: Exception Codes ......................................................................................................... - 85 -
Appendix E: Revision History .......................................................................................................... - 87 -

Tiny Modbus/TCP to RTU/ASCII Gateway
Copyright © 2017 ICP DAS CO., Ltd. All Rights Reserved. - 5 -
Packing List
The shipping package includes the following items:
Note
If any ofthese items are missing or damaged, please contact the localdistributorfor more information. Save the
shipping materialsand cartons in case you need to ship the module in thefuture.
More Information
Documentation
CD:\NAPDOS\tGW-700\Document
http://ftp.icpdas.com/pub/cd/tinymodules/napdos/tgw-700/document/
Firmware
CD:\NAPDOS\tGW-700\Firmware
http://ftp.icpdas.com/pub/cd/tinymodules/napdos/tgw-700/firmware/
Software
CD:\NAPDOS\Software
http://ftp.icpdas.com/pub/cd/tinymodules/napdos/software/
tGW-700/700i Series
Quick Start CA-002 Cable

Tiny Modbus/TCP to RTU/ASCII Gateway
Copyright © 2017 ICP DAS CO., Ltd. All Rights Reserved. - 6 -
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 module is a Modbus TCP/UDP 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 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.

Tiny Modbus/TCP to RTU/ASCII Gateway
Copyright © 2017 ICP DAS CO., Ltd. All Rights Reserved. - 7 -
In harsh industrial environments, the tGW-700 series (for i version) also adds 3000 VDC and +/- 4 kV
ESD protection component that diverts the potentially damaging charge away from sensitive circuit
to protects the module and equipment from the sudden and momentary electric current.
The tGW-700 module features a powerful 32-bit MCU that enables efficient handling of network
traffic, and also has a built-in web server that provides an intuitive web management interface that
allows users to modify the configuration of the module, including the DHCP/Static IP, the
gateway/mask settings and the serial port settings.
The tGW-700 module offers true IEEE 802.3af-compliant (classification, Class 1)
Power over Ethernet (PoE) functionality using a standard Category 5 Ethernet
cable to receive power from a PoE switch, such as the NS-205PSE. If there is
no PoE switch on site, the module will also accept power input from a DC
adapter. The tGW-700 module is designed for ultra-low power consumption,
reducing the hidden costs resulting from increasing fuel and electricity prices, especially when a
large number of modules are installed. Reducing the amount of electricity consumed by choosing
energy-efficient equipment can also have a positive impact on maintaining a green environment.
Comparison of Device Servers:
Series
Features
PPDS PDS DS tDS tGW
Virtual COM
   

Programmable
 
  
PoE

 
 
Modbus Gateway

  

Multi-client About 20 Sockets 1 Sockets/Port 10 Sockets/Port
Remarks Professional Powerful Isolation for
DS-715
Cost-effective,
Entry-level
Cost-effective,
Entry-level

Tiny Modbus/TCP to RTU/ASCII Gateway
Copyright © 2017 ICP DAS CO., Ltd. All Rights Reserved. - 8 -
1.1 Features
Supports Modbus TCP/UDP master and slave
Supports Modbus RTU/ASCII master and slave
Max. connections (masters) per serial port: 32 (tGW-71x), 16 (tGW-72x) or 10 (tGW-73x)
Read-cache ensures faster Modbus TCP/UDP response
Supports UDP responder for device discovery (UDP Search)
Static IP or DHCP network configuration
Easy firmware update via the Ethernet (BOOTP, TFTP)
Tiny Web server for configuration (HTTP)
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 (IEEE 802.3af, Class 1) and DC jack
Allows automatic RS-485 direction control
3000 VDC isolation and +/- 4 kV ESD protection for i versions
Male DB-9 or terminal block connector for easy wiring
Tiny form-factor and low power consumption
RoHS compliant with no Halogen
Cost-effective Modbus Gateway
1.2 Applications
Factory Automation
Building Automation
Home Automation
Remote Diagnosis and Management

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1.3 Ethernet Solutions
Nowadays, the Ethernet protocol has become the foremost standard for local area networks.
Connectivity via the Internet snow common in many of the latest applications from home
appliances, to vending machines, to testing equipment, to UPS, etc. An Ethernet network can link
office automation and industrial control networks, access remote systems and share data and
information between machines from multiple vendors, and also provides a cost-effective solution
for industrial control networks.

Tiny Modbus/TCP to RTU/ASCII Gateway
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1.4 Web Server Technology
Web server technology enables the tGW-700 to be configured via a standard web browser interface,
e.g., Google Chrome, Internet Explorer, or Firefox, etc. This means that it is easy to check the
configuration of the tGW-700 via an Ethernet network without needing to install any other software
tools, thereby reducing the learning curve required for maintaining the device.

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Copyright © 2017 ICP DAS CO., Ltd. All Rights Reserved. - 11 -
2. Hardware Information
This chapter provides a detailed description of the front panel, the hardware specifications, the pin
assignments, the wiring notes and the dimensions for the tGW-700 series modules.
2.1 Specifications
Model tGW-712
tGW-712i tGW-722 tGW-722i tGW-732 tGW-732i tGW-715 tGW-715i tGW-725 tGW-725i tGW-735 tGW-735i
tGW-718
tGW-718i
tGW-718-D
tGW-724
tGW-724i tGW-734 tGW-734i
System
CPU
32-bitARM
Communication Interface
Ethernet
10/100 Base-TX, 8-pin RJ-45 x 1, (Auto-negotiating,Auto-MDI/MDIX, LED indicator)
PoE (IEEE 802.3af, Class 1)
COM1 5-wire
RS-232 5-wire RS-232 3-wire RS-232
2-wire
RS-485
4-wire
RS-422
2-wire
RS-485 2-wire RS-485
tGW-718(i):
3-wireRS-232
tGW-718-D:
5-wireRS-232
2-wire
RS-485 2-wire RS-485
2-wireRS-485
4-wireRS-422
COM2 -
5-wire
RS-232
3-wire
RS-232
-
2-wire
RS-485
2-wire
RS-485
-
5-wire
RS-232
3-wire
RS-232
COM3 - -
3-wire
RS-232
- -
2-wire
RS-485
-
-
3-wire
RS-232
Self-Tuner
-
Yes, automatic RS-485 direction control
RS-4
85
Bias Resistor
-
Yes, 1 KΩ
Node
-
254 (max.)
UART
16c550 or compatible
Power Isolation
1000 V
DC
for only tGW-712i/722i/732i
Signal Isolation
3000 V
DC
for only tGW-715i/725i/735i/718i/724i/734i
ESD Protection
+/-4 kV
COM Port Format
Baud Rate
115200 bps Max.
Data Bit
5, 6, 7, 8
Parity
None, Odd, Even, Mark, Space
Stop Bit
1, 2
Power
Power Input
PoE: IEEE 802.3af, Class 1, DC jack: +12 ~ 48 V
DC
Power Consumption
0.07A @ 24 V
DC
Mechanism
Connector
10-Pin
Terminal x1
For tGW-722(i)/732(i)/715(i)/725(i)/735(i)/718(i)/724(i)/734(i)
Male DB-9 x1
For tGW-712(i)/718-D
Mounting
DIN-Rail
Flammability
Fire Retardant Materials (UL94-V0 Level)
Environment
Operating Temperature
-25 ~ +75 °C
Storage Temperature
-30 ~ +80 °C
Humidity
10 ~ 90% RH, non-condensing
Note: COM1/COM2/COM3 = TCP Port 502/503/504

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Copyright © 2017 ICP DAS CO., Ltd. All Rights Reserved. - 12 -
2.2 Appearance
PoE and Ethernet RJ-45 Jack
The tGW-700 module is equipped with an RJ-45 jack that is used as the 10/100 Base-TX Ethernet
port and features networking capabilities. When an Ethernet link is detected and an Ethernet
packet is received, the Link/Act LED (Orange) indicator will be illuminated. When power is supplied
via PoE (Power-over-Ethernet), the PoE LED (Green) indicator will be illuminated.
+12 to +48 VDC Jack
The tGW-700 is equipped with a +12VDC to +48 VDC jack that can be used to connect a power supply.
If no PoE switch is available on site, a DC adapter can be used to power the tGW-700 module.
5. Serial COM Ports
4. LED indicator
3. Operating Mode
Switch
2. +12 to +48 VDC Jack
1. PoE and Ethernet
RJ-45 Jack
6. DIN-Rail Mounting

Tiny Modbus/TCP to RTU/ASCII Gateway
Copyright © 2017 ICP DAS CO., Ltd. All Rights Reserved. - 13 -
Operating Mode Switch
Run Mode: Firmware operation Init Mode: Configuration mode
For tGW-700 series modules, the operating mode switch is set to the Run position by default. In
order to update the firmware for the tGW-700 series module, the switch must be moved from the
Run position to the Init position. The switch must be returned to the Run position after the update
is complete.
LED Indicator
Once power is supplied to the tGW-700 series module, the system LED (S1) indicator will illuminate.
An overview of the S1 LED functions is given below:
Function Color S1 LED Behavior
Running Firmware
Red
Steady ON
Network Ready Slow flashing – Once every 3 seconds
Serial Port Busy Rapid flashing – Once every 0.2 seconds
The following serial port LED indicators are tGW-718-D only. You can change the serial interface via
web server. An overview of the serial Port LED functions is given below:
Function Color RS-232/RS-485/RS-422 LED Behavior
RS-232 Green Steady ON (Default Settings)
RS-485 Red Steady ON
RS-422 Green Steady ON

Tiny Modbus/TCP to RTU/ASCII Gateway
Copyright © 2017 ICP DAS CO., Ltd. All Rights Reserved. - 14 -
Serial COM Ports
The number of serial COM Ports available depends on the type of tGW-700 module. For more
detailed information regarding the pin assignments for the Serial COM ports, refer to Section 2.4 Pin
Assignments .
DIN-Rail Mounting
The tGW-700 series modules include simple rail clips on
the bottom of the chassis that allow them to be reliably
mounted on a DIN-Rail or a wall. For more detailed information
regarding DIN-Rail Mounting, refer to the illustration in figure
below.
Mounting on a DIN-Rail
Dismounting form a DIN-Rail







Tiny Modbus/TCP to RTU/ASCII Gateway
Copyright © 2017 ICP DAS CO., Ltd. All Rights Reserved. - 15 -
2.3 Dimensions
The following diagrams provide the dimensions of the tGW-700 series module and CA-002 cable
that can be used as a reference when defining the specifications and the DC power supply plug for
any custom enclosures. All dimensions are in millimeters.
tGW-700 Series Module
tGW-712(i)/718-D:
tGW-722(i)/732(i)/715(i)/725(i)/735(i)/718(i)/724(i)/734(i):

Tiny Modbus/TCP to RTU/ASCII Gateway
Copyright © 2017 ICP DAS CO., Ltd. All Rights Reserved. - 16 -
CA-002 Cable
Note: Cable color: BLACK
NO DESCRIPTION QTY UNIT
1 UL2464 18AWG 2C(RED/BLACK)
0D5.0 COLOR BLACK 1 PCS
2 DC PLUG 5.5*2.1 1 PCS
3 PVC:45/P BLACK G
Pin Assignment
P1 P2
1 RED OPEN
2 BLACK OPEN

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Copyright © 2017 ICP DAS CO., Ltd. All Rights Reserved. - 17 -
2.4 Pin Assignments
tGW-712/tGW-712i
Note: The CTS and RTS pins are reserved and have no function.
tGW-722/tGW-722i
Note: The CTS and RTS pins are reservedand have no function.
tGW-712
tGW-712i
Terminal No.
Pin Assignment
COM1
09
N/A
N/A
08
CTS1
CTS1
07
RTS1
RTS1
06
N/A
N/A
05
GND
ISO.GND
04
N/A
N/A
03
TxD1
TxD1
02
RxD1
RxD1
01
N/A
N/A
tGW-722
tGW-722i
Terminal No.
Pin Assignment
10
F.G.
F.G.
COM2
09
CTS2
CTS2
08
RTS2
RTS2
07
RxD2
RxD2
06
TxD2
TxD2
COM1
05
GND
ISO.GND
04
CTS1
CTS1
03
RTS1
RTS1
02
RxD1
RxD1
01
TxD1
TxD1

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tGW-732/tGW-732i
tGW-715/tGW-715i
tGW-732
tGW-732i
Terminal No.
Pin Assignment
10
F.G.
F.G.
COM3
09
GND
ISO.GND
08
RxD3
RxD3
07
TxD3
TxD3
COM2
06
GND
ISO.GND
05
RxD2
RxD2
04
TxD2
TxD2
COM1
03
GND
ISO.GND
02
RxD1
RxD1
01
TxD1
TxD1
tGW-715
tGW-715i
Terminal No.
Pin Assignment
10
F.G.
F.G.
09
N/A
N/A
08
N/A
N/A
07
N/A
N/A
06
N/A
N/A
RS-485/RS-422
05
GND
ISO.GND
04
RxD1-
RxD1-
03
RxD1+
RxD1+
02
TxD1-/D1-
TxD1-/D1-
01
TxD1+/D1+
TxD1+/D1+

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tGW-725/tGW-725i
tGW-735/tGW-735i
tGW-725
tGW-725i
Terminal No.
Pin Assignment
10
F.G.
F.G.
09
N/A
N/A
08
N/A
N/A
07
N/A
N/A
COM2
06
GND
ISO.GND
05
D2-
D2-
04
D2+
D2+
COM1
03
GND
ISO.GND
02
D1-
D1-
01
D1+
D1+
tGW-735
tGW-735i
Terminal No.
Pin Assignment
10
F.G.
F.G.
COM3
09
GND
ISO.GND
08
D3-
D3-
07
D3+
D3+
COM2
06
GND
ISO.GND
05
D2-
D2-
04
D2+
D2+
COM1
03
GND
ISO.GND
02
D1-
D1-
01
D1+
D1+

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tGW-718/tGW-718i
tGW-718-D
tGW-718
tGW-718i
Terminal No.
Pin Assignment
10
F.G.
F.G.
09
N/A
N/A
RS-232
08
GND
ISO.GND
07
RxD1
RxD1
06
TxD1
TxD1
RS-485/RS-422
05
GND
ISO.GND
04
RxD1-
RxD1-
03
RxD1+
RxD1+
02
TxD1-/D1-
TxD1-/D1-
01
TxD1/D1+
TxD1/D1+
RS-232
RS-422
RS-485
Terminal No.
Pin Assignment
COM1
09
-
-
-
08
CTS
-
-
07
RTS
-
-
06
-
-
-
05
GND
GND
GND
04
-
RxD-
-
03
TxD
RxD+
-
02
RxD
TxD+
Data+
01
-
TxD-
Data-