General
Protocol conversion	Modbus TCP to Modbus RTU/ASCII
Number of serial ports	1
Serial interfaces	RS-232/422/485
Max. TCP master	16
Max. RTU/ASCII slaves per port	31
Max. TCP slaves with RTU/ASCII master	32
Configurable protocols	Modbus RTU, Modbus ASCII

The Moxa MB3180/EU is a Device-Server of the MGate MB3000 series, specifically designed as a Modbus Gateway for protocol conversion between Modbus TCP and Modbus RTU/ASCII. It enables integration of serial Modbus devices into existing Ethernet-based Modbus networks and conversely allows serial Modbus masters to access TCP-based Modbus slaves. The device family is designed for industrial applications requiring flexible and scalable networking of field devices.

Applications

The MB3180/EU is used in industrial automation systems where Modbus networks consist of different protocol variants. Typical application scenarios include connecting sensors, actuators, frequency converters, or PLCs operating via serial interfaces (RS-232/422/485) to an upper-level Modbus-TCP network. It is suitable for installations in manufacturing, energy supply, water management, and other sectors where cost-efficient and reliable communication between legacy and modern devices is required.

Functions and Features in Detail

The MB3180/EU features a single serial port configurable for RS-232, RS-422, or RS-485. This port can be individually operated for Modbus RTU or Modbus ASCII, with different baud rates also configurable. Configuration is performed via a web interface accessible through the integrated Ethernet interface. The devices support up to 16 simultaneous Modbus-TCP masters and can manage up to 31 RTU/ASCII slaves per serial port. When configured as an RTU/ASCII master, up to 32 TCP slaves per device are possible. This flexibility enables centralized control of multiple serial devices over a TCP network.

Technology Explained Simply

The MB3180/EU functions based on protocol conversion. A Modbus-TCP client (e.g., a SCADA system) sends a request over the network to the gateway. The device translates this request into a Modbus-RTU or -ASCII packet and forwards it via the serial interface to the corresponding device. The response from the serial device is then converted back into a Modbus-TCP packet and sent back to the original client. This process is transparent to the connected devices and enables seamless communication between different network types. The support for Modbus RTU and Modbus ASCII on a single port allows simultaneous connection of different device types.

Compatibility and Accessories

The MB3180/EU is compatible with all standard Modbus-RTU and -ASCII devices communicating via RS-232, RS-422, or RS-485. It can be used in combination with other models from the MGate MB3000 series, such as the MB3280 or MB3480, to manage larger networks with higher node density. The devices are designed for integration into existing Modbus-TCP networks and require no special software or additional configuration elements. Communication follows standardized Modbus protocol rules, ensuring high compatibility with common industrial devices.

Mounting and Installation

Installation is performed via the integrated Ethernet interface, which connects to the network through an RJ45 port. The serial interface is connected directly to the Modbus device. Configuration is done via a web interface accessible through a standard web browser. Settings include protocol selection (RTU/ASCII), baud rate, data bits, parity, and stop bits. The devices are designed for use in industrial environments and require no special mounting aids or additional components.

Operational Advantages

The MB3180/EU enables cost-efficient integration of serial Modbus devices into modern Ethernet networks. Support for up to 16 TCP masters and 31 RTU/ASCII slaves per port ensures high network density. Individual configuration of the serial port for different protocols and baud rates increases flexibility. The devices are designed for reliable, low-maintenance operation in industrial environments and reduce the need for additional hardware or software adapters.