AiGW600G 6-Port Fiber Optic Modbus Multi-Master Gateway: Long-Distance Anti-Interference Solution

AiGW600G Product Overview

The AiGW600G is an intelligent Modbus multi-master gateway with fiber optic interfaces developed by Shenzhen Yitian Guanglian Technology Co., Ltd. It integrates dual fiber optic ports, dual LAN Ethernet ports, and 6 RS485 serial ports, making it an ideal solution for long-distance, high anti-interference multi-system sharing of Modbus device data in industrial environments. The gateway supports intelligent Modbus switch mode, transparent transmission mode, and multi-master sharing mode. The fiber optic ports support daisy-chain cascading for self-organizing fiber optic networks, suitable for smart water, energy management, industrial automation, and other scenarios with high requirements for communication distance and anti-interference.

The AiGW600G features industrial-grade DIN rail mounting. It is equipped with F1 and F2 fiber optic interfaces (Tx/Rx), LAN1 and LAN2 Ethernet ports, 6-channel RS485 terminal blocks, six status indicators (PWR, CMD, Socket, Active, F1, F2), and power terminals. It is suitable for industrial sites with complex electromagnetic environments and long communication distances.

Key Product Features

• Dual fiber optic port design: F1 and F2 fiber optic interfaces, support daisy-chain cascading for self-organizing fiber networks, long communication distance and strong anti-interference
• 6-channel isolated RS485 serial ports: Each channel has independent A+, G, B- terminals, supports multi-bus concurrent polling
• Fiber + dual LAN multi-network port design: F1, F2 fiber ports plus LAN1, LAN2 Ethernet ports for flexible networking
• Intelligent Modbus switch mode: Automatic Modbus address table allocation, 5 buses concurrent polling, supports multi-master simultaneous read/write
• Protocol-independent transparent mode: 6 RS485 channels mapped to TCP/IP ports 6020-6025, any protocol can be transparently transmitted
• Multi-master sharing mode: 1 channel for slave, 5 channels for hosts, enabling multi-system data sharing

Hardware Interface and Indicator Description

Interface Layout

The AiGW600G gateway features industrial-grade DIN rail mounting. From left to right: F1 fiber port (Tx, Rx), F2 fiber port (Tx, Rx), LAN1 port, LAN2 port, 6-channel RS485 terminal blocks (in two groups of 3), and power terminals. Six status indicators are located on the right side.

Fiber Optic Interfaces

• F1 fiber port: First fiber optic interface, includes Tx (transmit) and Rx (receive) for fiber communication
• F2 fiber port: Second fiber optic interface, includes Tx (transmit) and Rx (receive) for fiber communication

Fiber cascading说明: The product's fiber ports support daisy-chain cascading and can self-organize fiber networks. When cascading, the previous device's F1 Tx connects to the next device's F1 Rx, and the previous device's F1 Rx connects to the next device's F1 Tx,实现 multi-device fiber series networking.

Ethernet Interfaces

• LAN1 port: Local area network port 1 for connecting local host or switch
• LAN2 port: Local area network port 2 for connecting local host or switch

RS485 Serial Port Definitions

Total 6 RS485 serial ports, each with terminal definitions A+, G, B-:

• RS485 1 (Port 1): First RS485 bus
• RS485 2 (Port 2): Second RS485 bus
• RS485 3 (Port 3): Third RS485 bus
• RS485 4 (Port 4): Fourth RS485 bus
• RS485 5 (Port 5): Fifth RS485 bus
• RS485 6 (Port 6): Sixth RS485 bus

Indicator Definitions

• PWR (red): Power indicator, solid on when powered
• CMD (green): Command/running status indicator, flashes during normal operation
• Socket (orange): Network connection indicator, solid or flashing when Socket connected
• Active (green): Data activity indicator, flashes during data communication
• F1 (green): Fiber port 1 communication indicator, flashes when F1 has data communication
• F2 (green): Fiber port 2 communication indicator, flashes when F2 has data communication

Three Operating Modes Detailed

The AiGW600G supports three operating modes, users can flexibly select according to field requirements:

Mode 1: Intelligent Modbus Switch Mode (Multi-Master Mode)

This is the core function mode of AiGW600G, using intelligent Modbus switch technology to achieve simultaneous access to multiple slave buses by multiple hosts.

Connection method:

• Fiber ports (F1/F2): Connect to host, connect remote host via fiber network
• LAN1/LAN2 ports: Connect to host, uses Modbus TCP protocol
• Ports 1, 2, 3, 4, 5: Connect to slave devices (such as flow meters, energy meters, PLCs, etc.)
• Port 6: Connect to Modbus host (such as touch screen, PLC, configuration software, etc.)

Modbus address table allocation:

• 1-Serial port 1, current range 1 to 10
• 2-Serial port 2, current range 11 to 20
• 3-Serial port 3, current range 21 to 30
• 4-Serial port 4, current range 31 to 40
• 5-Serial port 5, current range 41 to 50
• X-Exit

Working principle: Ports 1, 2, 3, 4, 5 connect to slaves, and each port is assigned a Modbus address table. All 5 buses use concurrent polling and support multi-master simultaneous read/write. The gateway automatically routes host requests to the corresponding slave bus based on the Modbus address table, achieving real-time performance no less than direct connection. Supports fiber hosts and Ethernet hosts to simultaneously access slave data.

Mode 2: Transparent Transmission Mode (All RS485 Ports Connect to Slaves)

In transparent mode, all 6 RS485 serial ports connect to slave devices, each serial port independently maps to a TCP/IP port,实现 transparent transmission of serial data to fiber/Ethernet, regardless of communication protocol.

TCP/IP port mapping:

• TCP/IP port 6020: Corresponds to RS485 port 1
• TCP/IP port 6021: Corresponds to RS485 port 2
• TCP/IP port 6022: Corresponds to RS485 port 3
• TCP/IP port 6023: Corresponds to RS485 port 4
• TCP/IP port 6024: Corresponds to RS485 port 5
• TCP/IP port 6025: Corresponds to RS485 port 6

Connection method: All RS485 ports connect to slaves, fiber and LAN ports connect to hosts. In transparent mode, any communication protocol can be transparently transmitted via fiber or Ethernet, suitable for networking devices with non-standard protocols and long-distance communication.

Mode 3: Multi-Master Sharing Mode (1 Slave + 5 Hosts)

In this mode, 1 RS485 channel connects to slave, the remaining 5 RS485 channels connect to hosts, enabling multiple Modbus hosts to simultaneously share data from one slave bus.

Connection method:

• Fiber, LAN ports: Connect to host via fiber or Ethernet
• Port 1: Connect to slave (Modbus RTU device)
• Ports 2, 3, 4, 5, 6: Connect to Modbus hosts (such as PLC, HMI touch screen, configuration software, etc.)

Working principle: The gateway caches slave data and distributes it to each host,实现 multi-master simultaneous read/write without bus conflicts. Supports fiber hosts, Ethernet hosts, and RS485 hosts to simultaneously access the same slave data.

Fiber Optic Cascading Networking

The AiGW600G's fiber ports support daisy-chain cascading and can self-organize fiber networks, especially suitable for long-distance, multi-point industrial field applications:

• Cascading method: The first device's F1 Tx connects to the second device's F1 Rx, the first device's F1 Rx connects to the second device's F1 Tx,串联 in sequence
• To next device: Each device's F2 port can connect to the next device, forming a fiber ring or chain network
• Communication advantages: Fiber communication has strong anti-electromagnetic interference capability and long communication distance, suitable for substations, water plants, mines and other complex electromagnetic environments
• Network topology: Supports chain, star, ring and other fiber network topologies

Technical Specifications

Typical Application Scenarios

• Smart Water: Long-distance water supply pipeline monitoring, fiber cascading networking, multi-channel flow meter data simultaneous sharing
• Energy Management: Substation/power plant energy consumption monitoring, fiber communication anti-electromagnetic interference, 6-channel energy meter bus concurrent collection
• Industrial Automation: Large factory multi-workshop device networking, fiber ring network ensures communication reliability
• Smart Building: Super high-rise building control system, fiber long-distance transmission without signal attenuation
• Mine/Tunnel: Underground/tunnel device monitoring, fiber intrinsic safety communication, safe and reliable
• Non-standard Protocol Device Networking: In transparent mode, any serial protocol can be transmitted via fiber or Ethernet