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Y202-R Standard Ethernet DTU Specification
MiniLink Draft: Placeholder spec for the dual-port Ethernet DTU. Detailed sections will be added later.
Document Control
| Item | Detail |
|---|---|
| Version | Draft |
| Release Date | TBD |
| Product Category | MiniLink 2-Port Ethernet DTU |
1. Overview
MiniLink Y202-R offers dual RS232/RS485 ports with RJ45 uplink for redundant control cabinets. Final documentation will describe power, switchable serial combos, and watchdog protections.
2. Linked Documents
Reference Manual: Y202-R Technical Manual
Document Control
| Item | Detail |
|---|---|
| Version | V1.0.0 |
| Release Date | December 2025 |
| Product Category | Standard Ethernet DTU (Dual-Port) |
Table of Contents
- Overview
- Ordering Information
- Key Features
- Technical Specifications
- Interfaces & Indicators
- Mechanical & Installation
- Application Notes
1. Overview
Y202-R is the dual-port member of the Yanji standard DTU family. It embeds two independent serial channels (RS232 or RS485 selectable per port) plus a 10/100 M Ethernet uplink for control cabinets that require redundant PLC, meter, or protection relays over TCP/IP. Each serial channel is paired with Socket A/B contexts, enabling simultaneous TCP/UDP/HTTP/MQTT data paths or Modbus RTU ↔ TCP conversion without touching legacy wiring.
| Item | Description |
|---|---|
| MCU & Firmware | Dual-core 240 MHz MCU, RTOS scheduler, dual watchdog |
| Serial Ports | 2 × RS232/RS485 (software-selectable combos) |
| Ethernet Uplink | 10/100Base‑T RJ45 with static/DHCP profiles |
| Power | 9–36 V DC terminal, DC barrel input optional |
| Installation | DIN-rail carrier with removable terminal block |
Positioning Highlights
- Retains two independent serial buses while giving each bus two sockets for concurrent SCADA + cloud access.
- Industrial-grade EMC (IEC 61000-4-2 Level 4) and 9–36 V supply survive substation and HVAC cabinets.
- Built-in browser console (default
192.168.10.8, admin/admin) removes the need for PC utilities. - Firmware parity with MiniLink series—registration packets, NET/UART heartbeats, HTTP OTA, remote AT channel.
2. Ordering Information
2.1 Model Naming
Y202-R-XX
- Y202 – Dual-port DTU platform.
- R – Ethernet uplink (RJ45).
- XX – Serial combination (e.g., 6H = 1×RS232 + 1×RS485).
2.2 SKU Matrix
| SKU | Serial Configuration | Description |
|---|---|---|
| Y202-R-2H | 2 × RS232 | Dual RS232 server, point-to-point PLC retrofit |
| Y202-R-4H | 2 × RS485 | Dual RS485 bus concentrator |
| Y202-R-6H | 1 × RS232 + 1 × RS485 | Mixed interface for PLC + field bus |
All SKUs share the same firmware and Ethernet feature set.
2.3 Standard Package
1 × Y202-R DTU (selected SKU)
1 × 6-pin pluggable power/serial terminal
1 × DIN-rail clip + screw kit
Digital quick guide & warranty card
Optional: 24 V DC adapter, RJ45 patch cord, USB-to-serial console lead.
3. Key Features
- Dual Independent Serial Buses – Each UART links to two sockets (A/B), supporting TCP/UDP server/client, HTTP client (GET/POST/AUTO), MQTT client, and Modbus gateway simultaneously.
- Carrier-Grade Networking – 10/100 M auto MDI/MDIX, static/DHCP selection, built-in DNS management, keepalive, and no-data reboot policies.
- Industrial Electrical Design – 9–36 V input with reverse-polarity guard, EFT/ESD surge suppression, dual watchdog (hardware + firmware) to prevent lockups.
- Browser & AT Provisioning – Embedded web console (Status/System/Port tabs) plus extensive AT command set accessible via serial or LAN broadcast discovery.
- Edge Automation Hooks – Programmable registration packets (FIRST/EVERY/ALL), NET/UART heartbeats, offline cache, JSON uploader, and Aliyun-friendly MQTT templates.
- Maintenance-Friendly – HTTP OTA downloads, USB DFU, parameter backup/restore commands (
AT+BKCFG,AT+RSTCFG), and Reload push-button for field resets.
4. Technical Specifications
4.1 Electrical & Environmental
| Parameter | Specification |
|---|---|
| Supply Voltage | 9–36 V DC (terminal) + 12 V barrel jack (optional) |
| Typical Current | 140 mA @ 12 V (dual sockets active) |
| Operating Temp | -35 °C ~ +75 °C (standard), -40 °C ~ +85 °C (extended) |
| Humidity | 5% ~ 95% RH, non-condensing |
| ESD/EFT | IEC 61000-4-2 Level 4, EFT ±2 kV |
| Protection | Reverse-polarity, overload fuse recommended |
4.2 Serial Interfaces
| Parameter | Specification |
|---|---|
| Ports | 2 × RS232/RS485 selectable (independent configuration) |
| Baud Rate | 1,200 – 460,800 bps (default 115,200) |
| Data Bits | 7/8 |
| Stop Bits | 1/2 |
| Parity | NONE / EVEN / ODD |
| Flow Control | NFC (RS232), auto-direction (RS485) |
| Packaging | Length trigger 64–1024 bytes, gap trigger 1–300 ms |
4.3 Ethernet
| Parameter | Specification |
|---|---|
| Interface | RJ45 10/100Base‑T, auto MDI/MDIX |
| IP Modes | Static (default 192.168.10.8/24), DHCP client |
| Services | HTTP config server, TCP/UDP sockets, HTTP Client, MQTT Client |
| Max Clients | Up to 8 TCP clients per socket in Server mode |
4.4 Firmware & Protocols
| Feature | Detail |
|---|---|
| Socket Profiles | Socket A/B: TCP Server/Client, UDP Server/Client, HTTP Client, MQTT Client |
| Registration Packets | MAC / Custom payload, FIRST / EVERY / ALL |
| Heartbeats | NET or UART heartbeats, 1–65,535 s |
| Modbus Gateway | RTU ↔ TCP conversion per port |
| JSON Scheduler | Modbus polling + JSON uplink with timestamp/ID metadata |
| OTA | HTTP download or USB DFU |
5. Interfaces & Indicators
| Group | Description |
|---|---|
| Power | 6-pin terminal: V+, V-, Port1 A/B (or TX/RX), Port2 A/B (or TX/RX); DC barrel (Ø5.5/2.1 mm) wired to V+/V- |
| Ethernet | RJ45 with LINK (green) / ACT (yellow) LEDs |
| Serial | Each port exposes swappable terminal pins for RS232 (TX/RX/GND) or RS485 (A/B/GND) |
| USB | Micro-USB (CDC) for console + firmware |
| Button | Reload – hold 3–10 s reloads saved config; >10 s factory reset |
| LEDs | POWER (steady), WORK (fast blink = booting, slow blink = network ready), DATA (off/steady/blink indicates socket state) |
Port Labeling: Front panel silk-screen shows COM1/COM2 along with RS232/RS485 legends to reduce wiring mistakes.
6. Mechanical & Installation
| Item | Value |
|---|---|
| Dimensions | 118 × 89 × 30 mm (body), excluding DIN clip |
| Weight | ≈180 g |
| Enclosure | Metal chassis with powder coating, UL94 V-0 insulation liners |
| Mounting | 35 mm DIN-rail shoe + optional wall-mount ears |
Installation guidelines:
- Keep ≥15 mm clearance around the case for airflow and RJ45 bend radius.
- Bond the DIN rail to protective earth when RS485 runs exceed 30 m.
- Use shielded twisted pair for RS485, terminate 120 Ω at bus ends, and keep drop cables <1 m.
7. Application Notes
- Dual-Bus SCADA Retrofit – Map COM1 Socket A to TCP Server for SCADA polling, COM1 Socket B to MQTT for cloud dashboards, while COM2 handles a separate PLC line via Modbus gateway.
- Redundant Control Rooms – Configure Socket A as TCP Client to control room A, Socket B as UDP Client to control room B. Heartbeats alert each center if the other loses connectivity.
- HVAC / Power Panels – Use registration packets (MAC or custom ID) so upstream platforms can automatically index multiple Y202-R units upon connection.
For detailed workflows, AT command references, and troubleshooting checklists, see the Y202-R Technical Manual.
- 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