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 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-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 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-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.
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.
Model has connectors: 1x 10/100 Base-TX RJ-45, 1x 5-wire RS-232, 1x 2-wire RS-485, 1x Male DB-9.