t GW - 7 0 0 Se r ie s Use r M a n u a l, V e r sion 1 .6 , Ju l. 2 0 1 1
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1 . I n t r odu ct ion
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-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 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.
The tGW-700 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 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 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.
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