NA111-E is a high-performance industrial serial port server that enables bidirectional data conversion between RS485 and Ethernet. It functions as a ModBus TCP to RTU/ASCII gateway and supports MQTT and HTTP IoT protocols, allowing legacy PLCs and RS485 sensors to connect seamlessly to modern cloud platforms and SCADA systems without custom hardware modification.
| Key Parameter | Specification |
|---|---|
| Product Model | NA111-E |
| Network Interface | RJ45 10/100Mbps (POE Powered Supported) |
| Serial Interface | RS485 (3-pin Phoenix Terminal) |
| Power Supply | DC 8–28 V or POE 802.3af |
| Protocol Stack | ModBus TCP/RTU/ASCII, MQTT, HTTP, TCP/UDP, IPv4 |
| Operating Temp | -40 ℃ to +85 ℃ (Industrial Grade) |
| Mounting Type | 35mm DIN Rail or Screw Fixed |
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Core Functional Mechanisms
1. ModBus Gateway Functionality
The NA111-E provides transparent conversion between ModBus TCP and ModBus RTU/ASCII. This allows Ethernet-based controllers to communicate with RS485-based ModBus devices directly, simplifying the integration of legacy automation equipment into modern IP networks.
2. Cloud IoT Integration (MQTT & HTTP)
With built-in MQTT and HTTP Client modes, the device connects RS485 serial data directly to IoT brokers like AWS IoT, Alibaba Cloud, or private RESTful APIs. It supports QoS levels and authentication for secure data transmission to the cloud.
3. Multi-Host Connectivity
In TCP Server mode, the device supports up to 6 simultaneous TCP client connections. This enables multiple masters, such as a local HMI and a remote SCADA system, to poll the same RS485 device concurrently.
Full Technical Specifications
| Hardware / Software | Detailed Specification |
|---|---|
| Operating Voltage | DC 8V – 28V / POE 802.3af (48V) |
| Baud Rate Range | 1200 bps – 230400 bps (Default 115200) |
| Data Transmission | 512 Byte Packet Framing / 1024 Byte Serial Buffer |
| Reliability Protection | Three-proof coating (Anti-mold, Anti-humidity, Anti-salt spray) |
| Configuration | Web browser UI, PC Tool, AT Commands |
| Weight | 90g ± 5g |
| Dimensions | 110mm x 66mm x 30mm |
Industrial Reliability & Protection
Engineered for harsh environments, the NA111-E features a conformal coating on the PCB to protect against moisture and salt spray. It includes a hardware watchdog to prevent software hangs and supports wide voltage input to handle industrial power fluctuations.
Application
Remote PLC Cloud Integration: The NA111-E acts as an essential bridge for legacy RS485 PLCs. By utilizing the built-in MQTTC/HTTPC gateway modes, integrators can push industrial data directly to cloud brokers like AWS or Alibaba Cloud without modifying standard PLC logic, solving the barrier of edge-to-cloud connectivity.
Smart Building Power Monitoring: In high-density distribution cabinets where cabling space is limited, the NA111-E's PoE support allows for a "single-cable" solution. Both data and power are delivered via a single RJ45 cable, eliminating the need for additional DC adapters and simplifying the wiring of multi-node Modbus energy meters.
Corrosive Industrial Environments: For wastewater treatment or coastal outdoor utility projects, the NA111-E features an internal three-proof coating (anti-salt spray, anti-humidity, and anti-mold). This industrial-grade protection ensures that the internal RS485 and Ethernet PHY circuitry remains stable under harsh humidity, preventing unexplainable packet loss and hardware degradation.
Frequently Asked Questions
Question: Can the NA111-E be powered by a standard 48V POE switch?
Answer: Yes, the NA111-E supports the standard IEEE 802.3af POE protocol, allowing it to receive both data and power through a single RJ45 cable when connected to a standard POE switch or injector.
Question: What is the maximum number of clients that can poll the RS485 bus at once?
Answer: When configured in TCP Server mode, the device allows up to 6 simultaneous TCP client connections, which is ideal for systems where multiple SCADA or monitoring stations need to access the same serial device.
Question: Does this serial server provide any environmental protection for the internal components?
Answer: Yes, the PCB is protected with a three-proof coating that makes it resistant to mold, humidity, and salt spray, ensuring long-term stability in industrial or agricultural outdoor environments.
Question: What happens to the connection if there is a sudden network interruption?
Answer: The device features an automatic reconnection mechanism for TCP and MQTT links, ensuring the server attempts to re-establish the data stream as soon as the network returns to a normal state.
Question: Is the device compatible with low voltage industrial power systems?
Answer: The NA111-E supports a wide DC voltage input range from 8V to 28V, making it highly versatile for use in various power environments including 12V and 24V control cabinets.
