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Y208-R Octo-Port Ethernet DTU Specification
Reference Manual: Y208-R Technical Manual
Document Control
| Item | Detail |
|---|---|
| Version | V1.0.0 |
| Release Date | December 2025 |
| Product Category | Standard Ethernet DTU (8-Port) |
Table of Contents
- Overview
- Ordering Information
- Key Features
- Technical Specifications
- Interfaces & Indicators
- Mechanical & Installation
- Application Notes
1. Overview
Y208-R is Yanji’s highest-density Ethernet DTU, integrating eight independent serial channels that can each operate as RS232 or RS485. Dual RJ45 uplinks (LAN1/LAN2) provide redundant IP paths or split networks, while per-port Socket A/B contexts support simultaneous TCP/UDP/HTTP/MQTT sessions. The platform inherits the same firmware stack as Y202-R/Y204-R, enabling Modbus RTU ↔ TCP conversion, JSON uploaders, heartbeats, and browser management for large power grids, factory cells, or environmental telemetry clusters.
| Item | Description |
|---|---|
| MCU & Firmware | Dual-core 240 MHz MCU, RTOS, dual watchdog |
| Serial Ports | 8 × RS232/RS485 selectable (grouped COM1–COM8) |
| Ethernet | 2 × 10/100Base‑T RJ45 with independent MACs |
| Power | 9–36 V DC terminal + dual DC barrel inputs |
| Installation | 35 mm DIN-rail industrial enclosure |
Positioning Highlights
- Handles up to 16 socket contexts (8 ports × Socket A/B), making it ideal for multi-feeder substations or MES cells streaming to redundant platforms.
- Dual RJ45 uplinks allow LAN1/LAN2 segmentation (e.g., SCADA + enterprise) with independent IP/DHCP settings.
- Firmware parity ensures JSON scheduler, registration packets, heartbeats, and HTTP OTA mirror smaller Y20x models.
- EMC-hardened power stage plus redundant connectors (terminal + twin DC barrels) keep eight serial buses online.
2. Ordering Information
2.1 Model Naming
Y208-R-XX
- Y208 – Eight-port Ethernet DTU.
- R – Dual RJ45 uplinks.
- XX – Serial mix (2H = 8×RS232, 4H = 8×RS485, 6H = split).
2.2 SKU Matrix
| SKU | Serial Configuration | Notes |
|---|---|---|
| Y208-R-2H | 8 × RS232 | Massive point-to-point controller clusters |
| Y208-R-4H | 8 × RS485 | Long multi-drop buses (meters, relays) |
| Y208-R-6H | 4 × RS232 + 4 × RS485 | Hybrid automation cells |
2.3 Standard Package
1 × Y208-R DTU
4 × pluggable COM terminal blocks (pairs)
DIN-rail kit + screws
Digital quick guide & warranty
Optional: dual 24 V PSUs, RJ45 cords, USB console cable.
3. Key Features
- Eight Independent COM Ports – Each port has RS232/RS485 pin-outs, independent packaging, heartbeats, registration packets, and socket A/B definitions.
- Dual Ethernet Uplinks – LAN1/LAN2 can be configured as static/DHCP independently, enabling network redundancy or segregated traffic paths.
- High-Density Socket Handling – 16 total socket contexts can mix TCP Server, TCP Client, UDP Server/Client, HTTP Client (GET/POST/AUTO), and MQTT for varied backends.
- Industrial Power & EMC – 9–36 V terminal plus twin DC barrel inputs allow redundant supplies; the board includes reverse protection, EFT/ESD suppression, and hardware watchdog.
- Comprehensive Firmware Toolkit – Embedded web UI, broadcast discovery, AT commands, Modbus gateway, JSON scheduler, Aliyun helper, offline cache, remote AT channel.
- Maintenance-Friendly – HTTP OTA, USB DFU, parameter backup/restore, and Reload button streamline field servicing.
4. Technical Specifications
4.1 Electrical & Environmental
| Parameter | Specification |
|---|---|
| Supply Voltage | 9–36 V DC terminal + dual 12 V barrels (LAN1/LAN2 PSU) |
| Typical Current | 360 mA @ 12 V (all ports active) |
| Operating Temp | -35 °C ~ +75 °C |
| Humidity | 5% ~ 95% RH (non-condensing) |
| ESD/EFT | IEC 61000-4-2 Level 4, EFT ±2 kV |
| Protection | Reverse polarity, fuse recommended |
4.2 Serial Interfaces
| Parameter | Specification |
|---|---|
| Ports | 8 × RS232/RS485 selectable |
| 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 trigger 64–1024 bytes, gap trigger 1–300 ms |
4.3 Ethernet & Firmware
| Item | Specification |
|---|---|
| LAN1/LAN2 | Dual RJ45 10/100Base‑T, independent MAC/IP |
| IP Modes | Static (192.168.10.8/24 default on LAN1) or DHCP per port |
| Services | HTTP config server, TCP/UDP sockets, HTTP Client, MQTT Client |
| Modbus Gateway | RTU ↔ TCP per COM port |
| JSON / Cloud | Modbus polling, JSON mapping, Aliyun helper |
| OTA | HTTP download, USB DFU |
5. Interfaces & Indicators
| Group | Description |
|---|---|
| Power | 2-wire terminal (V+/V-) + dual DC barrel (Ø5.5/2.1 mm) feeding redundant supplies |
| Serial | Four detachable terminal blocks labeled COM1–COM8; each block includes TX/RX/GND or A/B/GND legends |
| Ethernet | LAN1/LAN2 RJ45 with LINK/ACT LEDs |
| USB | Micro-USB console/upgrade |
| Button | Reload (restore/ factory reset) |
| LEDs | POWER, WORK, DATA (global) + optional per-port TX/RX indicators |
Note: COM groups are internally isolated to reduce ground loops across large cabinets.
6. Mechanical & Installation
| Item | Value |
|---|---|
| Dimensions | 190 × 115 × 40 mm (body) |
| Weight | ≈420 g |
| Enclosure | Metal chassis, powder-coated, UL94 V-0 liners |
| Mounting | 35 mm DIN rail or panel ears |
Installation guidance:
- Maintain ≥25 mm clearance above/below for airflow and cable bend radius.
- Ground DIN rail to PE when RS485 trunks exceed 50 m.
- Label COM blocks to avoid miswiring during maintenance swap-outs.
7. Application Notes
- Substation Node Concentrator – Map each port to a feeder, use LAN1 for SCADA (TCP Server) and LAN2 for cloud telemetry (MQTT). Registration packets embed feeder ID for quick identification.
- Manufacturing Gateway Farm – COM1–COM4 serve robots/PLCs via RS232, COM5–COM8 feed sensor buses via RS485; NET heartbeats ensure server awareness, while JSON scheduler pushes aggregated values upstream.
- Redundant Control Rooms – Socket A on every port targets Control Room A, Socket B targets Control Room B. In case of LAN1 outage, LAN2 maintains connectivity through DHCP failover.
See the Y208-R Technical Manual for step-by-step configuration, AT command references, and diagnostics.
- 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