Y201-W Mini Wi-Fi DTU Specification

Reference: Y201-W Technical Manual

Contents

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

1. Overview

Y201-W is the Wi-Fi model in the Y201 mini DTU family. It provides single-serial-port to Wi-Fi data bridging, with RS232, RS485 or TTL interface options, and uses a 240 MHz 32-bit RISC-V processor with 5 to 36 VDC wide-range power input. The serial port supports Socket A and Socket B network links, making it suitable for industrial data collection, building control, remote maintenance, and wireless networking.

The device supports AP, STA, and AP+STA wireless modes, along with TCP, UDP, HTTP, and MQTT. It also supports Modbus TCP to Modbus RTU conversion and can be configured through the built-in Web UI or AT commands.

Item	Description
Positioning	Single-serial-port to Wi-Fi industrial DTU
Processor	32-bit RISC-V, up to 240 MHz
Serial Ports	1 port, with RS232, RS485 or TTL interface options
Wireless Modes	AP / STA / AP+STA
Power Input	5 to 36 VDC
Configuration	Web UI, serial AT, network AT

Highlights

• One serial port with Socket A and Socket B network channels for multi-center data paths
• Supports 2.4 GHz and 5 GHz operation with Wi-Fi 6 compatibility
• Built-in Modbus RTU to Modbus TCP gateway for SCADA integration
• Registration packets, heartbeat packets, auto reconnect, and fault self-recovery
• Supports Web-based upgrade and HTTP remote upgrade

2. Ordering Information

2.1 Model Configuration

Y201-W is a mini DTU with a Wi-Fi uplink. It has one serial port with RS232, RS485 or TTL interface options. Confirm the required interface when ordering.

For family codes and examples, see Model Groups and Suffixes.

2.2 Serial Interface Options

Model	Serial Ports	Interface Options
Y201-W	1	RS232 or RS485 or TTL

2.3 Standard Package

1 x Y201-W device, electronic documentation, warranty information.
Optional accessories: SMA antenna, serial cable harness, power adapter, DIN mounting accessories.

3. Key Features

1. One Serial Port, Dual Links: One serial port with RS232, RS485 or TTL interface options. Socket A and Socket B provide parallel network communication paths, not additional serial ports.
2. Broad Protocol Support: Supports TCP client/server, UDP client/server, HTTP client, and MQTT.
3. Flexible Wireless Networking: Supports AP, STA, and AP+STA; AP mode can serve 1 to 8 terminals.
4. Modbus Gateway: Supports Modbus TCP to Modbus RTU conversion.
5. Enhanced Data Handling: Supports packetization by length or interval, plus registration and heartbeat packets.
6. Comprehensive Maintenance: Supports LAN discovery, network AT, serial upgrade, and network upgrade.
7. Automatic Recovery: Supports reboot on network inactivity timeout for unattended deployments.

4. Technical Specifications

4.1 Electrical and Environmental

Parameter	Specification
Dimensions	74 x 27 x 15.6 mm, excluding tabs and terminal
Operating Temperature	-40 to 85 °C
Operating Humidity	5 to 95% RH, non-condensing
Power Connector	2.54 x 7P terminal
Supply Voltage	5 to 36 VDC
Current Consumption	55 mA @ 12 V

4.2 Wireless Specifications

Parameter	Specification
Standard	Compatible with 802.11ax / 802.11ac and fully backward-compatible with 802.11b/g/n
Mode	AP, 1 to 8 STA / STA / AP+STA
TX Power	20.5 dBm max
Antenna Interface	SMA connector, external thread and female center
Security	WPA-PSK / WPA2-PSK / WPA3-PSK

4.3 Serial Specifications, 1 Port

Parameter	Specification
Interface Type	RS232 or RS485 or TTL
Baud Rate	1200 to 460800 bps, default 9600
Parity	NONE / ODD / EVEN, default NONE
Data Bits	7 / 8, default 8
Stop Bits	1 / 2, default 1
Hardware Flow Control	Not supported

4.4 Network and Protocol Capability

Item	Specification
Network Protocols	DHCP / DNS / TCP / UDP / HTTP / ICMP / MQTT
TCP Server Concurrency	Up to 8 clients per port
Socket Modes	Socket A / B on the single serial port; only Socket A enabled by default
Packet Length	8 to 1460 bytes, default 1460
Packet Interval	0 to 1000 ms, 0 = adaptive

4.5 Software and Maintenance

Item	Description
Built-In Web UI	Parameter setting, status display, firmware upgrade
AT Commands	Serial AT and network AT
LAN Discovery	Default UDP port 8168, keyword HuayunIOT
Firmware Upgrade	Web upgrade and HTTP download upgrade

5. Interfaces and Indicators

5.1 LEDs

LED	Meaning
Power	Power indicator
Work	Slow blink: Wi-Fi connected; fast blink: Wi-Fi disconnected
TX1 / RX1	Serial transmit / receive activity

5.2 Button

Button	Function
Reset	Press and hold for more than 3 s to restore default parameters

6. Installation and Access

6.1 Quick Access

1. Connect the device to the field controller with the serial cable.
2. Power on the device.
3. Search for and connect to the default hotspot HY-W202.
4. Open 192.168.4.1 in a browser.
5. Log in with admin/admin.
6. Configure Socket parameters on the Port page and reboot the device.

6.2 Debug Example, TCP Server

For example, set Socket A on Port 1 to TCP server with port 6666. After reboot, use a TCP client to connect to 192.168.4.1:6666 for transparent transmission testing.

6.3 Mechanical Dimensions

This dimension drawing applies to the Y201 mini enclosure and can be used as an installation reference for the Y201-W.

7. Application Notes

• Wireless serial bridging: Bring traditional serial devices onto WLAN without additional Ethernet cabling.
• Point-to-point communication: Supports AP and STA combinations for point-to-point wireless transmission.
• Modbus retrofit: Use gateway mode for Modbus RTU to Modbus TCP conversion.
• Cloud connectivity: Supports MQTT and HTTP client uplink, including Alibaba Cloud mode.
• Remote maintenance: Supports network AT, LAN discovery, and HTTP upgrade for remote service.

For detailed parameter settings and AT commands, see the Y201-W Technical Manual.

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• Manufacturer: Hunan YenGear Tech Co., Ltd.
• Address: Room 21014, Building 1, Fudi Xingguang Tiandi, Yingxin Road, Yuhua District, Changsha, Hunan, China
• Email: [email protected]
• Website: www.yengear.com