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Y204-R Quad-Port Ethernet DTU Specification
Reference Manual: Y204-R Technical Manual
Document Control
| Item | Detail |
|---|---|
| Version | V1.0.0 |
| Release Date | December 2025 |
| Product Category | Standard Ethernet DTU (4-Port) |
Table of Contents
- Overview
- Ordering Information
- Key Features
- Technical Specifications
- Interfaces & Indicators
- Mechanical & Installation
- Application Notes
1. Overview
Y204-R expands the Yanji Ethernet DTU portfolio to four independent serial channels. Each COM port can be configured as RS232 or RS485, and each carries dual socket contexts (A/B). Combined with a 10/100 M RJ45 uplink, Y204-R replaces legacy serial device servers by adding transparent TCP/UDP/HTTP/MQTT tunnels, Modbus RTU ↔ TCP gateway capability, and web-based management without touching cabinet wiring.
| Item | Description |
|---|---|
| MCU & Firmware | 240 MHz dual-core MCU, RTOS, hardware + software watchdog |
| Serial Ports | 4 × RS232/RS485 selectable (isolated per channel) |
| Ethernet | 10/100Base‑T RJ45, static/DHCP modes |
| Power | 9–36 V DC terminal, 12 V barrel jack (front) |
| Installation | DIN-rail enclosure with removable terminal blocks |
Positioning Highlights
- Four independently managed serial buses, each mirrored to Socket A/B for simultaneous SCADA, MES, or cloud feeds.
- Full firmware parity with other Yanji DTUs—registration packets, NET/UART heartbeats, HTTP OTA, JSON uploader, Aliyun-ready MQTT template.
- EMC-hardened power plus dual supply connectors (terminal + barrel) for redundant 24 V/12 V feeds.
- Browser console and AT command set ensure rapid commissioning without vendor software.
2. Ordering Information
2.1 Model Naming
Y204-R-XX
- Y204 – Quad-port Ethernet DTU platform.
- R – RJ45 uplink.
- XX – Serial combination (2H = 4×RS232, 4H = 4×RS485, 6H = mixed).
2.2 SKU Matrix
| SKU | Serial Configuration | Notes |
|---|---|---|
| Y204-R-2H | 4 × RS232 | Ideal for dense PLC/HMI retrofits |
| Y204-R-4H | 4 × RS485 | Multi-drop meters / protection relays |
| Y204-R-6H | 2 × RS232 + 2 × RS485 | Mixed topology (engineering station + bus) |
2.3 Standard Package
1 × Y204-R DTU
2 × 8-pin pluggable serial/power terminals (COM1/2 and COM3/4)
DIN-rail bracket + screws
Digital quick-start card + warranty
Optional: 24 V adapter, RJ45 cable, USB console lead.
3. Key Features
- Four Independent COM Ports – Each port supports RS232/RS485 pin-outs, socket A/B concurrency, per-port Modbus conversion, and dedicated heartbeat/registration settings.
- Scalable Socket Matrix – Eight total sockets (4 ports × 2 sockets) allow combinations such as dual TCP Servers, MQTT uplinks, HTTP POST telemetry, and UDP maintenance channels simultaneously.
- Robust Electrical Design – 9–36 V DC input with reverse protection, EFT/ESD hardening, plus DC barrel jack for secondary PSU; dual watchdog resets hung sessions.
- Integrated Web & AT Workflow – Status/System/Port tabs mirror AT commands, enabling remote parameter edit, firmware upgrade, backup/restore, and HTTPS OTA.
- Automation & Cloud Hooks – JSON scheduler, Modbus polling engine, Aliyun credential helper, NET/UART heartbeats, offline cache, and remote AT channel for hands-free SCADA integration.
- Zero-Tool Commissioning – Broadcast discovery utility or built-in web UI (default
192.168.10.8, admin/admin) accelerate cabinet bring-up.
4. Technical Specifications
4.1 Electrical & Environmental
| Parameter | Specification |
|---|---|
| Supply Voltage | 9–36 V DC terminal + 12 V barrel jack |
| Typical Current | 220 mA @ 12 V (four sockets active) |
| Operating Temp | -35 °C ~ +75 °C (standard) |
| Humidity | 5% ~ 95% RH, non-condensing |
| ESD/EFT | IEC 61000-4-2 Level 4, EFT ±2 kV |
| Protection | Reverse-polarity + user-fused input recommended |
4.2 Serial Interfaces
| Parameter | Specification |
|---|---|
| Ports | 4 × configurable RS232/RS485 |
| Baud Rate | 1,200–460,800 bps |
| Data Bits | 7/8 |
| Stop Bits | 1/2 |
| Parity | NONE / EVEN / ODD |
| Flow Control | NFC (RS232), auto-direction (RS485) |
| Packaging | Length (64–1024 bytes) or gap (1–300 ms) trigger |
4.3 Ethernet & Firmware
| Item | Specification |
|---|---|
| RJ45 | 10/100Base‑T, auto MDI/MDIX |
| IP Modes | Static (192.168.10.8/24) or DHCP |
| Services | HTTP config server, TCP/UDP sockets, HTTP Client, MQTT Client |
| Modbus Gateway | RTU ↔ TCP per port |
| JSON / Cloud | Modbus polling + JSON mapping, Aliyun MQTT shortcut |
| OTA | HTTP download, USB DFU |
5. Interfaces & Indicators
| Group | Description |
|---|---|
| Power | 2-wire terminal (V+/V-) + DC barrel (Ø5.5/2.1 mm) |
| Serial | Two removable terminal blocks: COM1/2 and COM3/4, each labeled TX/RX/GND or A/B/GND (selectable) |
| Ethernet | RJ45 with LINK/ACT LEDs |
| USB | Micro-USB console/upgrade |
| Button | Reload for config recovery / factory reset |
| LEDs | POWER, WORK, DATA per chassis; optional TX/RX indicators located near each COM group |
Isolation: Each COM port is galvanically isolated from the others to minimize cross-talk in high-noise cabinets.
6. Mechanical & Installation
| Item | Value |
|---|---|
| Dimensions | 150 × 110 × 35 mm (body) |
| Weight | ≈260 g |
| Enclosure | Metal chassis with powder coating, UL94 V-0 liners |
| Mounting | 35 mm DIN rail (default) or panel-mount ears |
Installation tips:
- Provide ≥20 mm clearance for airflow and RJ45 bend radius.
- Route shielded RS485 pairs separately from AC mains; bond shields at one end.
- Use ferrules on terminal wiring to prevent loose strands during maintenance.
7. Application Notes
- Substation Concentrator – Assign each COM to a feeder relay; Socket A publishes Modbus TCP to SCADA, Socket B mirrors MQTT telemetry to the enterprise cloud.
- Manufacturing Cell – Use COM1/2 for PLC/drive clusters and COM3/4 for tester fixtures; registration packets encode line ID for automatic backend routing.
- Redundant Control – Configure NET heartbeats (60 s) plus no-data reboot (30 min) to ensure unattended recovery after network outages.
Refer to the Y204-R Technical Manual for socket workflows, Modbus gateway configuration, AT command tables, and troubleshooting.
- Manufacturer: Hunan Yanji Tech Co.,Ltd
- Address: Room 21014, Unit 1, Fudixingguang Plaza, Yuhua District Yingxin Road, Changsha, Hunan, P.R. China
- Email: hi@yanjiiot.com
- Website: www.yanjiiot.com