NA111-A is an industrial-grade RS485 to Ethernet serial server featuring wide-voltage AC 85~265V power supply, multi-mode Modbus/MQTT/HTTP gateways, and standard DIN-rail mounting for reliable PLC and IoT device networking.
| Technical Parameter | Specifications |
|---|---|
| Model Number | NA111-A |
| Supply Voltage | AC 85 ~ 265V |
| Network Protocol | IP, TCP/UDP, HTTPD, IPV4, MQTT |
| Interface Mode | RJ45 & 3*3.81mm Phoenix Terminal (RS485) |
| Gateway Functions | Modbus TCP/RTU, MQTTC/HTTPC IoT Gateway |
| Installation | Standard DIN-rail Mounting |
| Dimensions & Weight | 92 * 66 * 30mm | 141g±5g |
Download Manual
AT command
NA111-A Manual
Serial port server firmware update package
Virtual serial port
configuration tool
Company Proflile
Application
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Industrial PLC Remote Monitoring: The NA111-A bridges legacy RS485 PLCs to factory Ethernet networks. Its wide AC 85~265V power input allows direct integration into industrial control cabinets without extra DC transformers, enabling real-time centralized data acquisition via Modbus TCP.
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Energy Management Systems: In smart building power monitoring, the NA111-A collects data from RS485 smart meters. Utilizing the MQTTC IoT gateway mode, it pushes electrical parameters directly to cloud platforms, solving the challenge of cross-network data reporting in distributed power distribution rooms.
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Warehouse Automation & Environmental Sensing: Integrating multiple RS485 humidity and temperature sensors, the NA111-A provides a robust HTTP Client interface. It converts serial environmental data into standard web requests for server-side logging, ensuring stable data transmission in high-interference industrial storage areas.
FAQ
Q: How does the NA111-A internal AC-DC conversion circuit handle industrial power fluctuations?
A: The NA111-A is designed with an industrial-grade switching power supply module that supports a wide input range of AC 85V to 265V. It incorporates multi-stage EMI filtering and surge protection to maintain a stable internal 3.3V/5V DC logic rail even during transient grid spikes or dips, ensuring that the serial data framing remains consistent without loss of sync.
Q: What are the impedance matching requirements for the RS485 Phoenix terminal in long-distance cabling?
A: For RS485 bus runs exceeding 200 meters, it is recommended to enable or add a 120-ohm termination resistor at both ends of the bus to match the characteristic impedance of the twisted-pair cable. This prevents signal reflections caused by impedance discontinuities at the high-speed transition edges of the UART data, significantly reducing bit error rates in high-baud-rate Ethernet-to-Serial conversions.
Q: How does the Modbus Gateway mode process concurrent TCP requests to a single RS485 slave device?
A: The NA111-A features an internal Modbus arbitration mechanism that manages a request queue for concurrent TCP clients. When multiple TCP masters poll the same RS485 bus, the server serializes these requests, waiting for the slave device response or the specified timeout interval before proceeding to the next packet. This ensures data integrity and prevents collision on the half-duplex RS485 physical layer.
