The Ebyte NA111-E is an industrial-grade RS485-to-Ethernet serial port server that bidirectionally converts RS485 serial data to Ethernet (TCP/IP). It supports ModBus TCP ↔ RTU/ASCII gateway, MQTT Client, HTTP Client, TCP/UDP Server & Client modes — enabling any RS485 device or PLC to connect directly to cloud platforms, SCADA systems, or local networks without custom firmware.
| Key Parameter | Value |
|---|---|
| Model | NA111-E |
| Serial Interface | RS485 (3-pin 3.81 mm Phoenix terminal) |
| Network Interface | RJ45 Ethernet (10/100 Mbps) + POE input |
| Power Supply | DC 8–28 V or POE (802.3af) |
| Protocols | TCP/UDP, ModBus TCP/RTU/ASCII, MQTT, HTTP, IPv4, DHCP, DNS |
| Operating Temp | −40 ℃ to +85 ℃ (industrial grade) |
| Dimensions | 110 × 66 × 30 mm (L × W × H) |
| Weight | 90 g ± 5 g |
| Mounting | DIN rail (guide rail) or screw holes |
| Protection | Three-proof coating (anti-mold, anti-humidity, anti-salt spray) |
Full Technical Specifications
| Parameter | Specification |
|---|---|
| Operating Voltage | DC 8–28 V (NA111-E) / POE 802.3af |
| Serial Interface | RS485 — 3 × 3.81 mm Phoenix terminal |
| Network Interface | RJ45, 10/100 Mbps Ethernet |
| Working Modes | TCP Server (default), TCP Client, UDP Server, UDP Client, HTTP Client, MQTT Client |
| ModBus Modes | ModBus TCP ↔ RTU gateway; ModBus TCP ↔ ASCII gateway; ModBus RTU/ASCII pass-through |
| Max TCP Clients | 6 simultaneous connections (TCP Server mode) |
| Network Protocols | TCP/UDP, MQTT, HTTP, IPv4, DHCP, DNS |
| IP Assignment | Static IP (default: 192.168.3.7) or DHCP |
| DNS Server | 114.114.114.114 (customizable) |
| Default Local Port | 8887 (customizable) |
| Subnet Mask | 255.255.255.0 (customizable) |
| Default Gateway | 192.168.3.1 (customizable) |
| Serial Buffer | 1024 Byte |
| Packet Framing | 512 Byte |
| Baud Rate | 1200–230400 bps (default 115200) |
| Data Bits | 5 / 6 / 7 / 8 (default 8) |
| Stop Bits | 1 (default) / 2 |
| Parity | None (default) / Odd / Even |
| Flow Control | None (default) / RTS-CTS / DSR-DTR / XON-XOFF |
| Configuration Methods | Web browser UI, Ebyte parameter config tool, AT commands |
| Default Login | IP: 192.168.3.7 · User: admin · Pass: admin |
| Firmware Upgrade | Remote OTA upgrade supported |
| Operating Temp | −40 ℃ to +85 ℃, 5%–95% RH (non-condensing) |
| Storage Temp | −40 ℃ to +105 ℃, 5%–95% RH (non-condensing) |
| Dimensions | 110 × 66 × 30 mm |
| Weight | 90 g ± 5 g |
| Mounting | DIN rail / positioning holes |
| Protection Coating | Three-proof paint (anti-mold, anti-humidity, anti-salt spray) |
| SKU / Barcode | NA111-E / 6938690763650 |
Nine Core Functions & Functional Framework
① TCP/UDP — Four Communication Mechanisms
Supports TCP Server, TCP Client, UDP Server, and UDP Client. TCP Server mode accepts up to 6 simultaneous client connections, enabling multi-master SCADA polling over a single RS485 bus.
② ModBus Gateway — TCP ↔ RTU/ASCII Transparent Conversion
The NA111-E acts as a ModBus gateway: it converts ModBus TCP requests from the Ethernet side into ModBus RTU or ASCII commands on the RS485 bus — and vice versa. No host-side driver changes required. Compatible with any standard ModBus TCP master (SCADA, HMI, PLC).
③ Multiple Configuration Methods
Configure via web browser (access 192.168.3.7), Ebyte parameter configuration tool (Windows), or AT commands over serial. All parameters are stored in non-volatile memory.
④ MQTT Client — Direct Cloud IoT Integration
Built-in MQTT Client connects RS485 devices directly to AWS IoT, Alibaba Cloud, EMQX, Mosquitto, or any MQTT broker. Supports QoS 0/1, custom topics, username/password authentication, and TLS (optional).
⑤ Special Features — Heartbeat, Auto-Reconnect, Registration Packet
⑥ HTTP Client
Supports HTTP GET/POST to push RS485 data to REST APIs or web servers without a middleware gateway.
⑦ POE Power Supply (802.3af)
The NA111-E supports Power over Ethernet (POE) — a single Cat5e/Cat6 cable delivers both data and power (DC 8–28 V or POE), eliminating the need for a separate power adapter at the installation point.
⑧ DIN Rail (Guide Rail) Installation
Standard 35 mm DIN rail clip included. Also supports screw-hole panel mounting. Designed for installation inside industrial control cabinets.
⑨ Remote OTA Firmware Upgrade
Firmware can be upgraded remotely over the network — no physical access to the device required. Reduces maintenance cost for deployed units in the field.
Industrial-Grade Reliability & Protection
| Protection Feature | Detail |
|---|---|
| Three-Proof Coating | Anti-mold, anti-humidity, anti-salt spray — conformal coating on PCB |
| Wide Temperature | −40 ℃ to +85 ℃ operating; −40 ℃ to +105 ℃ storage |
| Wide Voltage Input | DC 8–28 V — tolerates industrial power fluctuations |
| ESD Protection | RS485 port with TVS surge protection |
| Watchdog | Hardware watchdog for automatic recovery from software hang |
| Auto-Reconnect | Automatic TCP/MQTT reconnection after network interruption |
Interface & Indicator Display
| Interface / Indicator | Description |
|---|---|
| RS485 Terminal | 3-pin 3.81 mm Phoenix connector (A+, B−, GND) |
| RJ45 Port | 10/100 Mbps Ethernet with Link & Activity LEDs |
| Power Input | 2-pin screw terminal for DC 8–28 V |
| PWR LED | Green — power on |
| NET LED | Yellow — network connected / data activity |
| SER LED | Blue — serial port data activity |
| Reset Button | Long press ≥5 s to restore factory defaults |
Ideal Applications
| Industry | Use Case |
|---|---|
| Industrial Automation | PLC remote monitoring, RS485 sensor/actuator networking, SCADA integration |
| Energy & Power | Solar inverter data collection, smart meter reading, battery management systems |
| Building Automation | HVAC control, access control, fire alarm panel networking |
| Smart Agriculture | Soil sensor, weather station, irrigation controller over Ethernet/cloud |
| Water Treatment | Pump station monitoring, flow meter data upload to SCADA |
| Logistics & Warehousing | Barcode scanner, weighing scale, conveyor controller integration |
NA111 Series Model Comparison
| Model | Power Input | POE | Dimensions | Weight |
|---|---|---|---|---|
| NA111 | DC 8–28 V | No | 110×66×30 mm | 80 g ± 5 g |
| NA111-E ✅ (this product) | DC 8–28 V | Yes (802.3af) | 110×66×30 mm | 90 g ± 5 g |
| NA111-M | POE only | Yes | 93×28×27 mm | 40 g ± 5 g |
| NA111-A | AC 85–265 V | No | 110×66×30 mm | 90 g ± 5 g |
Frequently Asked Questions (FAQ)
Q: What is the difference between NA111-E and NA111?
A: The NA111-E adds POE (Power over Ethernet, 802.3af) support. Both models share the same RS485 interface, protocol stack, and 110×66×30 mm enclosure. Choose NA111-E when you want to power the device via the Ethernet cable without a separate DC adapter.
Q: Does the NA111-E support ModBus TCP to RTU conversion?
A: Yes. The NA111-E has a dedicated ModBus gateway mode that transparently converts ModBus TCP (Ethernet side) ↔ ModBus RTU or ASCII (RS485 side). It also supports pass-through (transparent) mode for custom protocols.
Q: How many TCP clients can connect simultaneously?
A: In TCP Server mode, the NA111-E supports up to 6 simultaneous TCP client connections, allowing multiple SCADA masters or HMIs to poll the same RS485 bus concurrently.
Q: Can the NA111-E connect to AWS IoT or Alibaba Cloud via MQTT?
A: Yes. The built-in MQTT Client supports standard MQTT brokers including AWS IoT Core, Alibaba Cloud IoT, EMQX, and Mosquitto. Configure broker address, port, topic, QoS, and credentials via the web UI or AT commands.
Q: How do I configure the NA111-E?
A: Three methods are available: (1) Web browser — connect to 192.168.3.7 (default), login admin/admin; (2) Ebyte PC configuration tool (Windows); (3) AT commands via the RS485 serial port. All settings are saved to non-volatile memory.
Q: What baud rates does the RS485 port support?
A: The RS485 port supports 1200 to 230400 bps (default 115200 bps), with configurable data bits (5/6/7/8), stop bits (1/2), parity (None/Odd/Even), and flow control (None/RTS-CTS/DSR-DTR/XON-XOFF).
Package Contents
- 1 × Ebyte NA111-E RS485 to Ethernet Serial Port Server
- 1 × DIN rail mounting clip
- 1 × Quick start guide
- Ethernet cable, DC power adapter, and POE switch/injector are not included.
