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Y204-R 4-Port Ethernet DTU Specification ​

Y204-R Product

Reference: Technical manual coming soon. Related: Serial Gateway Overview

Contents ​

  1. Overview
  2. Ordering Information
  3. Key Features
  4. Technical Specifications
  5. Interfaces and Indicators
  6. Mechanical and Installation
  7. Application Notes

1. Overview ​

Y204-R expands the Yengear Ethernet DTU family to four independent serial channels. Each COM port can be configured as RS232 or RS485, and each carries dual Socket contexts, A and B. Together with a 10/100Base-T RJ45 uplink, Y204-R replaces traditional serial device servers while adding transparent TCP, UDP, HTTP, and MQTT tunnels, Modbus RTU to Modbus TCP conversion, and browser-based management.

ItemDescription
MCU and FirmwareDual-core 240 MHz MCU, RTOS, hardware and software watchdog
Serial Ports4 x RS232 / RS485, selectable per channel
Ethernet10/100Base-T RJ45, static IP or DHCP
Power Input9 to 36 VDC terminal, 12 V barrel input on front panel
MountingDIN-rail enclosure with removable terminal blocks

Highlights ​

  • Four independently managed serial buses, each mirrored to Socket A and B for concurrent SCADA, MES, or cloud access
  • Firmware parity with the rest of the standard DTU family, including registration packets, NET/UART heartbeat, HTTP OTA, JSON upload, and Alibaba Cloud MQTT templates
  • EMC-hardened power design with terminal and barrel connectors for redundant 24 V or 12 V feeds
  • Browser console and AT command set for fast debugging without vendor-specific software

2. Ordering Information ​

2.1 Model Naming ​

Y204-R-XX

  • Y204: 4-port DTU platform
  • R: Ethernet uplink through RJ45
  • XX: Serial interface combination, typically all RS232 or all RS485

2.2 Typical SKU Options ​

SKUSerial ConfigurationTypical Application
Y204-R-2324 x RS232Legacy PLC, HMI, and instrument consolidation
Y204-R-4854 x RS485Multi-drop metering and protection relay cabinets

3. Key Features ​

  1. Four Independent Serial Channels: Consolidates multiple field devices onto one Ethernet uplink.
  2. Dual Socket per Port: Socket A and B on every port enable concurrent service or redundant paths.
  3. Industrial Protocol Support: Supports TCP, UDP, HTTP, MQTT, and Modbus RTU to Modbus TCP conversion.
  4. High-Reliability Power Design: Wide-range DC input, watchdog protection, and redundant power connector options.
  5. Convenient Maintenance: Web UI, remote AT, JSON upload, and HTTP OTA.

4. Technical Specifications ​

4.1 Electrical and Hardware ​

ParameterSpecification
ProcessorDual-core 240 MHz MCU
Power Input9 to 36 VDC terminal, optional 12 V barrel
ProtectionEMC hardening, hardware and software watchdog
MountingDIN-rail industrial enclosure

4.2 Serial and Network ​

ParameterSpecification
Serial Ports4 x RS232 / RS485
Ethernet10/100Base-T RJ45
IP ModeStatic IP / DHCP
Socket ChannelsSocket A and B for each serial port

4.3 Software Functions ​

ItemDescription
ProtocolsTCP / UDP / HTTP / MQTT
Gateway FunctionModbus RTU to Modbus TCP
Value-Added FunctionsRegistration packet, NET/UART heartbeat, JSON upload, HTTP OTA
MaintenanceWeb UI and remote AT

5. Interfaces and Indicators ​

Interface / IndicatorDescription
COM1 to COM4Four serial interfaces for field devices
RJ45Ethernet uplink
Power Terminal / Barrel JackRedundant power input options
Status LEDsPower, link, and data activity
Reload ButtonParameter recovery and maintenance

6. Mechanical and Installation ​

6.1 Dimension Drawing ​

Y204-R Dimensions

This drawing can be used for cabinet installation and wiring clearance planning for the Y204-R.

  • DIN-rail enclosure for industrial control cabinets
  • Removable terminal blocks for quick field replacement
  • Recommended for control panels that need to retain four independent serial buses

7. Application Notes ​

  • Cabinet consolidation: Bring four serial devices onto a single IP uplink.
  • SCADA and MES coexistence: Separate OT and IT data flows with Socket A and B.
  • Protocol retrofit: Convert Modbus RTU field devices to Modbus TCP for upper-layer platforms.
  • Manufacturer: Hunan YenGear Tech Co., Ltd.
  • Address: Room 21014, Building 1, Fudi Xingguang Tiandi, Yingxin Road, Yuhua District, Changsha, Hunan, China
  • Email: hi@yengear.com
  • Website: www.yengear.com