The EKI-1221-CE from Advantech is a 1-port Modbus gateway designed to connect Modbus serial devices (RS-232/422/485) to Ethernet networks using Modbus TCP/IP. It’s ideal for industrial automation systems that need to bridge legacy serial protocols with modern Ethernet infrastructure.

 Communication & Protocols

• Serial Interface: 1 × RS-232/422/485 (DB9 male)
• Ethernet Ports: 2 × 10/100 Mbps RJ45 (for LAN redundancy)
• Baud Rate: 50 to 921.6 kbps
• Supported Protocols:
  • Modbus RTU (Client/Server)
  • Modbus ASCII (Client/Server)
  • Modbus TCP
• Connections:
  • Up to 16 Modbus client connections per serial port
  • Up to 64 sessions under Modbus server mode

 Power & Protection

• Input Voltage: 12–48 VDC (redundant dual inputs)
• Power Consumption: ~3.2 W
• Isolation:
  • Serial to Ethernet: 2 kV
  • Serial to Power: 2 kV
  • Ethernet to Power: 1.5 kV
• Surge Protection: 4 kV for signal ports
• ESD Protection: 15 kV for all serial signals

 Physical & Environmental Specs

• Dimensions: 36.6 × 140 × 95 mm
• Mounting: DIN-rail or wall
• Operating Temp: –10°C to 60°C
• Enclosure: Metal, IP30-rated
• Certifications: CE, FCC, UL 62368, Class 1 Division 2, IECEx, ATEX