Gateway RS485 to Ethernet POE

DIN-Rail mount modules

CODE: EK-BU1-485-TCP

Description

Bidirectional gateway for integrating serial Modbus and IP networks. The Ekinex EK-BU1-485-TCP interface is a modular device designed to enable bidirectional communication between equipment equipped with a Modbus RS-485 port and the IP data network. Thanks to its versatility, the gateway allows serial Modbus devices to be easily integrated into Ethernet network infrastructures, ensuring a reliable and stable connection.

The device features:

  • an RS-485 serial port for connecting Modbus devices
  • an RJ45 connector for interfacing with the IP data network

The interface is designed for mounting on a 35 mm DIN rail, suitable for electrical panels or distribution cabinets. Power can be supplied in two ways: via PoE (Power over Ethernet) directly from the LAN cable, or via an auxiliary DC power supply (6–36 VDC).

Operation

The EK-BU1-485-TCP gateway allows bidirectional conversion of the Modbus protocol between an RS-485 serial line and an Ethernet/IP network. Designed as a universal device, it can operate in conjunction with any equipment that acts as a Modbus master, ensuring maximum flexibility of integration into automation and supervision systems.

In the Delègo environment, the gateway allows the number of RS-485 serial lines managed by the system to be expanded. The Delègo Server has a native RS-485 port for direct connection of Modbus devices; if communication with devices on multiple serial lines is required, one or more EK-BU1-485-TCP gateways can be used, thus expanding the system's capabilities in a simple and scalable manner.

Technical data
Power supply
  • 6-36V DC or PoE port
  • Isolation between power supply and signal
Environmental conditions
  • Operating temperature: -40℃ to +85℃
  • Storage temperature: -40℃ to +85℃
  • Relative humidity: <95% non-condensing
Communication interfaces
  • 1 x Isolated RS-485
  • 1 x RJ45 PoE port, supports IEEE 802.3af standard
RS-485 parameters
  • Baud Rate: 1200 ~ 115200 bps
  • Parity Bit: None, odd parity, even parity, mark, space
  • Data Bit: 5 ~ 9 bits
  • Flow Control: No flow control
Software
  • Configuration: Web browser
  • Protocols: Ethernet, IP, TCP, UDP, HTTP, ARP, ICMP, DHCP, DNS
Functions / Features
  • Plastic housing
  • Designed for mounting on a 35 mm profile rail (according to EN 60715)
  • IP20 protection rating (according to EN 60529)
  • Safety class II
  • Weight 50 g
  • Modular device 2 UM (1 UM = 18 mm)
  • Dimensions 36 x 87 x 59 mm (W x H x D)
Configurationa and commissioning
STEKBU1485TCP_EN
  • v. 1.0 (13/11/2025)
  • PDF | 611,9 KB
  • Download
FISPEKBU1485TCPIEX0
  • v. 1.0 (13/11/2025)
  • PDF | 594,9 KB
  • Download
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