tGW-735i Isolated Modbus TCP to Modbus RTU/ASCII gateway (3xRS485)

Description

The tGW-735i is an Isolated 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.

For ease of use, the tGW-735 supports DHCP client and a UDP responder functions to minimise configuration errors caused by manual IP address configuration. It's powerful 32-bit MCU enables efficient handling of network traffic, while the built-in web server 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.

Features

• Supports Modbus TCP/UDP master and slave
• Supports Modbus RTU/ASCII master and slave
• Max. TCP 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 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
• 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 & no Halogen
• Cost-effective Modbus gateway

Specifications