Key features

• • Converts and routes Modbus between serial line (RTU/ASCII) and Modbus/TCP networks.
• • IEEE 802.11 b/g WLAN with Infrastructure and Soft AP modes.
• • Universal serial port selectable as RS232, RS422, or RS485 (DB9 male).
• • Supports multiple TCP connections (max. 4 channels) for practical SCADA/HMI integration.
• • RP-SMA connector for external antenna options; supports WPA/WPA2 and WPA-Enterprise options.

Modbus protocol conversion in real projects

SMG-5400 bridges the gap between legacy serial Modbus devices and modern IP-based Modbus/TCP systems. Use it to connect meters, controllers, and sensors to SCADA/HMI software over Wi-Fi—without changing field devices.

• • Ideal for retrofits and expansions where Ethernet cabling is expensive or impractical.
• • Universal serial port supports typical industrial wiring (RS485 multi-drop, RS422 point-to-point, RS232 local).

Wi-Fi setup: Infrastructure or Soft AP

Use Infrastructure mode to join an existing Wi-Fi network, or Soft AP mode when you need direct access for commissioning (for example, when there is no available access point on site).

• • Soft AP is useful for field setup and maintenance workflows.
• • Security options include WPA/WPA2 and WPA-Enterprise variants (depending on configuration).