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Tiny Modbus TCP to RTU/ASCII Gateway with PoE and 1 x 3-wire RS-232/RS-485/RS-422 Port (ROHS).  Supports Operating Temperatures -25C to 75C (-13F to 167F)


Tiny Modbus TCP to RTU/ASCII Gateway with PoE and 1 x 3-wire RS-232/RS-485/RS-422 Port (ROHS). Supports Operating Temperatures -25C to 75C (-13F to 167F)

  Price:  $199.00  

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Modbus has become a de facto standard industrial communication protocol, 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-718 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.

DHCP minimizes configuration errors caused by manual IP address configuration, such as address conflicts caused by the assignment of an IP address to more than one computer or device at the same time. The tGW-700 module supports the DHCP client function, which allows it to easily obtain the necessary TCP/IP configuration information from a DHCP server. The module also contains a UDP responder that transmits its IP address information in response to a UDP search from the eSearch utility, making local management more efficient.

The tGW-718 module features a powerful 32-bit MCU to enable 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 module contains a dual watchdog, including a CPU watchdog (for hardware functions) and a host watchdog (for software functions). The CPU watchdog automatically resets the CPU if the built-in firmware is operating abnormally, while the host watchdog automatically resets the CPU if there is no communication between the module and the host (PC or PLC) for a predefined period of time (system timeout). The dual watchdog is an important feature that ensures the module operates continuously, even in harsh environments.

The tGW-718 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-718 module is designed for ultra-low power consumption, reducing hidden costs from increasing fuel and electricity prices, especially when you have a large number of modules installed. Reducing the amount of electricity consumed by choosing energy-efficient equipment can have a positive impact on maintaining a green environment.

The module is equipped with a male DB-9 or a removable terminal block connector to allow easy wiring. Based on an amazing tiny form-factor, the tGW-700 achieves maximum space savings that allows it to be easily installed anywhere, even directly embedded into a machine. It also supports automatic RS-485 direction control when sending and receiving data, thereby improving the stability of the RS-485 communication.


  • 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 (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
  • Supports TCP, UDP, HTTP, DHCP, BOOTP and TFTP protocols
  • Supports UDP responder for device discovery
  • Allows easy firmware update via the Ethernet
  • Contains a tiny Web server for configuration
  • Male DB-9 or terminal block connector for easy wiring
  • Tiny form-factor and low power consumption
  • RoHS compliant with no Halogen
  • Made from fire retardant materials (UL94-V0 Level)


  • Factory , Building and Home Automation
  • Remote Diagnosis and Management


Model tGW-712 tGW-722 tGW-732 tGW-715 tGW-725 tGW-735 tGW-718 tGW-724 tGW-734
CPU 32-bit ARM
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 (TCP Port: 502) 5-wire RS-232 5-wire RS-232 3-wire RS-232 2-wireRS-485
4-wire RS-422
2-wire RS-485 2-wire RS-485 3-wire RS-232 2-wire RS-485 2-wire RS-485
4-wire RS-422
COM2 (TCP Port: 503) - 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 (TCP Port: 504) - - 3-wire RS-232 - - 2-wire RS-485 - - 3-wire RS-232
Self-Tuner - Yes, automatic RS-485 direction control
UART 16c550 or compatible
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 Input PoE: IEEE 802.3af, Class 1
DC jack: +12 ~ 48 VDC
Power Consumption 0.05 A @ 24 VDC
Connector Male DB-9 x 1 10-Pin Removable Terminal Block x 1
Mounting DIN-Rail
Flammability Fire Retardant Materials (UL94-V0 Level)
Operating Temperature -25 ~ +75 °C
Storage Temperature -30 ~ +80 °C
Humidity 10 ~ 90% RH, non-condensing

Selection Guide

Model RS-232 RS-422/485 RS-485 CPU Ethernet Baud Rate COM1
TCP Port: 502
TCP Port: 503
TCP Port: 504
tGW-712 1 - - 32-bit ARM 10/100 Base-TX, PoE 115200 bps 5-wire RS-232 - -
tGW-722 2 - - 5-wire RS-232 5-wire RS-232 -
tGW-732 2 - - 3-wire RS-232 3-wire RS-232 3-wire RS-232
tGW-715 - 1 - 2-wire RS-485
4-wire RS-422
- -
tGW-725 - - 2 2-wire RS-485 2-wire RS-485 -
tGW-735 - - 3 2-wire RS-485 2-wire RS-485 2-wire RS-485
tGW-718 1 - 3-wire RS-232 - -
2-wire RS-485
4-wire RS-422
tGW-724 1 - 1 2-wire RS-485 5-wire RS-232 -
tGW-734 2 - 1 2-wire RS-485 3-wire RS-232 3-wire RS-232

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