Modbus RTU /Ethernet Gateway• Integrated Serial Port Server (Serial Device Server)
• Modbus RTU Server/ Client • Modbus RTU to MQTT Gateway • Cloud JSON data to Modbus RTU • TCP Server/ Client, UDP, UDP Multicast • TCP Server • Auto-Polling Storage Multi Modbus/TCP Client to Single Modbus RTU Server • Cloud Modbus/TCP to Modbus RTU Client Access Modbus Gateway• Modbus RTU protocol to Modbus/TCP
• RTU/Register Auto Polling and Storage • Allows Multiple points access same serial device • Scheduling Polling Modbus RTU register JSON to Modbus RTU• CSV JSON Table
• Scheduling Polling Modbus RTU register • Scheduling Publish in JSON format • Subscribe support request and Setting Modbus Register
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Wireless• WiFi AP, WiFi Client, WiFi to Ethernet Router
• Security WEP/WPA-PSK/WPA2-PSK • Data Encryption WEP64/WEP128/TKIP/AES Modbus RTU to MQTT• Publish RTU data in JSON format
• Subscribe JSON to Modbus RTU by HTTP Post, HTTP Get • NTP support for Network Time Synchronize
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NPS6131A | NPS6131AI
The NPS6131A is a compact industrial wireless RS485 device server and IoT gateway, ideal for industrial use. It combines functions like a serial device server, Modbus gateway, MQTT gateway, RS485-to-JSON gateway, and virtual COM port tool. Equipped with RS485, 802.11b/g WiFi, and an RJ45 Ethernet port, it ensures reliable connectivity. The NPS6131AI model adds isolation protection to the RS485 interface. It converts RS485 to WiFi TCP/IP and integrates Modbus RTU to TCP, with WiFi functioning as a client or AP. Its DIN-rail mount design supports easy installation, while the wide power input range (10–30VDC) and Virtual COM tool make it a cost-effective, space-saving solution.
-Virtual COM Device Discovery and Management
-Device Setting
-Cloud MQTT Configuration
-Web Configuration
| Network Interface | |
| Ethernet | 10/100M RJ45 |
| Wireless | 802.11b/g WiFi |
| Serial Interface | |
| Connector | Screw Terminal Connector, 2-wire RS-485-A / -B Max 32 x RS-485 Nodes, Max 1200 Meter Distance, 120 Ohm Terminal Resistor for > 300Meters |
| Isolation (NPS6131AI) | 1.5KV RS485 |
| Serial Parameters | Baud Rate: 1200~115200bps, Data Bit: 5~9 Parity Check: None, Odd, Even, Space, Mark Flow Control: None Flow Control |
| Service Mode | |
| Virtual COM Driver | Windows XP / Windows 7 / Windows 10/ Windows 11 |
| Wireless | STA (Client) / AP |
| Security | WEP/WPA-PSK/WPA2-PSK |
| Encryption | WEP64/WEP128/TKIP/AES |
| TCP | TCP Server for up to 30 TCP clients, or TCP client to up to 7 destination IP |
| UDP / UDP Multicasting | UDP Polling & Response by UDP packet between stations UDP Multicast to all station by UDP packet |
| Modbus | Modbus RTU to Modbus TCP Modbus TCP to Modbus RTU |
| Cloud | MQTT, JSON to Modbus RTU, HTTP Post, HPPT Get |
| Network Feature | |
| Protocol | Ethernet, IP, TCP, UDP, HTTP, ARP, ICMP, DHCP, DNS, Modbus |
| Security | TCP with authentication key |
| DHCP | DHCP Client for IP and DNS information from DHCP server |
| NTP | Network Time Precision (NTP) |
| Management | |
| System Management | Windows Utility, Virtual COM, WEB Management |
| Windows DLL Library | Device management function library (Windows DLL dynamic link library) by VC, VB, Delphi, or C++ Builder with functions such as read and write. |
| Power Input & Interface Connector | |
| Power Input | 10~30VDC Input, Terminal Block |
| Wireless | |
| Frequency | 2.412GHz-2.484GHz |
| Transmit Power | 802.11b: +20dBm(Max.); 802.11g: +18dBm(Max.) |
| Sensitivity | 802.11b: -89dBm; 802.11g: -81dBm; |
| Antenna | SMA External |
| Mechanical & Installation | |
| Installation | Din-Rail |
| Enclosure | Durable, flame-retardant enclosure that withstands up to 100°C without deformation and self-extinguishes when removed from a fire source |
| IP Protection | IP40 |
| Dimension | 87x36x59mm (LxWxH), Packing Box160x123x79mm, 52pcs per Carton |
| Environmental | |
| Operation Temperature | -25°C~70°C, 0% ~ 90%, Non-Condensing |
| Storage Temperature | -40°C~80°C, 0% ~ 90%, Non-Condensing |
| Reliability & Warranty | |
| MTBF | > 200,000 Hours |
| Warranty | 3 Year |
| Model | Description |
| NPS6131A | Wireless One port RS485 Device Server, Modbus, MQTT Gateway, 10~30Vdc, antenna included |