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Y201-G Mini 4G DTU Specification
Reference Manual: Y201-G Technical Manual
Document Control
| Item | Detail |
|---|---|
| Version | V1.0.0 |
| Release Date | November 2025 |
| Product Category | Mini 4G DTU |
Table of Contents
- Overview
- Ordering Information
- Key Features
- Technical Specifications
- Interfaces & Indicators
- Mechanical & Installation
- Application Notes
1. Overview
Y201-G is the MiniLink Series 4G LTE member of the Y201 mini DTU family. It targets cabinets and edge panels that need cellular backhaul without changing existing RS485/RS232 wiring, delivering Cat1 LTE connectivity, SIM lifecycle management, and remote diagnostics inside a palm-sized DTU. With built-in TCP/UDP/HTTP/MQTT channels, MiniLink Y201-G moves factory, power, and environmental telemetry to cloud platforms even in harsh, power-constrained cabinets.
| Item | Description |
|---|---|
| MCU & OS | Industrial MCU with real-time task scheduler and hardware watchdog |
| Serial Interfaces | RS485 (2-pin), RS232 (3-pin), TTL (3-pin), selectable |
| Cellular Uplink | LTE Cat1 full-netcom with integrated SIM tray |
| Dimensions | 74.6 × 22.6 × 18.1 mm (without ears/antenna base) |
| Mounting | DIN-rail clip or panel mounting ears |
Positioning Highlights
- Palm-sized cellular DTU gateway for power, building automation, environmental monitoring, and OEM controller retrofits
- Provides 4 concurrent socket pipelines for redundant or multi-host connectivity over LTE networks
- Built-in Modbus polling and JSON reporting reduce SCADA workload and bandwidth consumption
2. Ordering Information
2.1 Model Naming
Y201-G-IF
- G: 4G LTE Cat1 cellular uplink
- IF: Serial interface option (485 = RS485 default, 232 = RS232, TTL = 3.3 V TTL)
2.2 SKU Table
| SKU | Serial Interface | Notes |
|---|---|---|
| Y201-G-485 | RS485 2-wire | Default build for industrial bus |
| Y201-G-232 | RS232 3-wire | Point-to-point integration |
| Y201-G-TTL | 3.3 V TTL | Direct MCU integration |
2.3 Standard Package
1× Y201-G MiniLink 4G DTU, 1× 5-pin power/serial plug, DIN clip, English quick guide (digital), warranty card.
Optional accessories: 9–36 VDC power adapter, USB-RS485 converter, pre-crimped terminal cables.
3. Key Features
- Ultra-Compact & Rugged – Palm-sized enclosure, metal shielding frame, -35 °C ~ +75 °C standard operation with extended -40 °C ~ +85 °C tolerance.
- Wide Power Input – Accepts 9–36 VDC via 5-pin pluggable terminal, reverse-polarity protected, typical draw 100 mA @ 12 V.
- Flexible Serial Access – RS485/RS232/TTL options with configurable baud (1.2–460.8 kbps), parity, data bits, stop bits, and hardware flow control.
- Multi-Protocol Data Forwarding – Supports transparent TCP/UDP sockets, HTTP(S) client GET/POST/AUTO modes, MQTT publish/subscribe, private HY cloud, point-to-point relay, and Modbus JSON uplink pipelines over LTE.
- Smart Buffer & Packaging – Dual trigger packing (length/time) optimizes throughput; offline cache holds up to 50 frames/20 KB during outages.
- Industrial Reliability – Soft & hardware watchdogs, ESD protection (IEC 61000-4-2 level 4), configurable reboot-on-silence timers.
- Remote Maintenance – Network AT commands, remote upgrade via HTTP, heartbeat/registration packets, Modbus polling engine with JSON mapping.
4. Technical Specifications
4.1 Electrical & Environmental
| Parameter | Specification |
|---|---|
| Supply Voltage | 9~36 VDC |
| Typical Current | 100 mA @ 12 V |
| Operating Temperature | -35 °C ~ +75 °C (standard), -40 °C ~ +85 °C (extended) |
| Humidity | 5% ~ 95% RH (non-condensing) |
| ESD Protection | IEC 61000-4-2 Level 4 |
4.2 Serial Interfaces
| Parameter | Specification |
|---|---|
| Modes | RS232 / RS485 / TTL (select one active) |
| Baud Rate | 1,200 ~ 460,800 bps (default 115,200) |
| Data Bits | 8 (optional 7) |
| Stop Bits | 1 or 2 |
| Parity | NONE / ODD / EVEN |
| Flow Control | NFC for RS232; 485 direction auto-drive |
4.3 Cellular Interface
| Parameter | Specification |
|---|---|
| Air Interface | LTE-FDD: B1/B3/B5/B8 (uplink/downlink 5/10 Mbps); LTE-TDD: B34/B38/B39/B40/B41 (uplink/downlink 2/8 Mbps) |
| Transmit Power | Class 3, 23 dBm ±2 dB |
| SIM | Nano-SIM slot with card detect; supports APN/VPDN |
| Protocols | TCP, UDP, HTTP 1.0/1.1, MQTT 3.1/3.1.1 |
| Socket Channels | 4 concurrent tunnels (A/B/C/D) per DTU |
| SMS | Supports transparent SMS, AT-based SMS, SMS-AT control |
4.4 Firmware Capability
| Feature | Detail |
|---|---|
| Socket Packing | Length trigger (64–1024 bytes) and gap trigger (1–300 ms) |
| Heartbeat | Periodic UART or network heartbeat, 1–86400 s |
| Registration Packet | IMEI/ICCID/User-defined payload, modes: first/data/every |
| Modbus JSON | Multiple register types (int/float/BCD), custom key names, optional IO/GPS fields |
| Offline Cache | 20 KB circular buffer, up to 50 frames |
| Data Conversion | ASCII/HEX conversion in uplink/downlink directions |
5. Interfaces & Indicators
| Group | Description |
|---|---|
| Power | 5-pin pluggable terminal: V+, V-, RS485A/B or RS232 TX/RX |
| Serial | RS485 2-pin, RS232 3-pin, TTL 3-pin headers |
| Cellular | Nano-SIM slot, SMA antenna connector |
| USB | Micro-USB for local upgrade (driver required) |
| LED Indicators | POWER (steady), WORK (fast blink pre-registration, slow blink after network attach), DATA (off = disconnected, on = connected, blink = traffic) |
| Button | Reload: press 3–10 s to restore stored parameters |
6. Mechanical & Installation
| Item | Value |
|---|---|
| Dimensions | 74.6 × 22.6 × 18.1 mm (excl. mounting ears) |
| Weight | 35 g (typical) |
| Enclosure | PC/ABS, UL94 V-0 flame rating |
| Mounting | DIN-rail adapter or dual M3 ear mounting |
Installation guidance:
- Maintain ≥10 mm clearance above/below when mounted beside power supplies.
- Use shielded twisted pair for RS485 and keep serial cable < 30 m without repeaters.
- Add 1 A inline fuse near the power source.
7. Application Notes
- SCADA/PLC Bridging: Map legacy Modbus-RTU sensors to cloud networks without rewriting PLC logic by leveraging the built-in Modbus polling plus JSON uplink.
- Building & Energy: Combine RS485 power meters or HVAC controllers with BMS platforms using simultaneous TCP + MQTT sockets for redundancy over LTE.
- OEM Remote Service: Pair the remote AT + heartbeat functions with a central service to push firmware updates and monitor edge device health even when wired networks are unavailable.
For protocol registers, AT commands, and integration workflows, consult the accompanying Y201-G 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