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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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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NPS5431S
The NPS5431S is a din-rail design serial server/Modbus gateway with four RS485 ports featuring 1500V optocoupler isolation. It effectively isolates interference on the RS485 bus, ensuring stable device operation and reliability, making it suitable for environments with RS485 bus interference. It integrates multiple functions, including serial device server, Modbus gateway, MQTT gateway, RS485-to-JSON gateway, and virtual COM port device tool. It has built-in surge protection for the power supply, supports a wide voltage range of 10–30V, and uses a terminal-type power connection with a grounding wire on the casing. The two mounting ears on the top can be installed either horizontally or vertically, allowing for flexible installation on a backplane or desktop. It comes with two 10M/100M Ethernet ports, allowing connection to either one of them. The other Ethernet port can be used for cascading multiple NPS5431S via a network cable, enabling expansion to 8, 12, or 16 serial ports.
-Virtual COM Device Discovery and Management
-Device Setting
-Cloud MQTT Configuration
-Web Configuration
| Network Interface | |
| Ethernet | Two 10/100M Ethernet with 2KV Surge Protection |
| Serial Interface | |
| Connector | 4 x RS485 Screw Terminal Connector, 2-wire RS-485-A / -B, GND Max 32 x RS-485 Nodes, Max 1200 Meter Distance, 120 Ohm Terminal Resistor for > 300Meters |
| Serial Parameters | Baud Rate: 1200~38400bps, 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 |
| 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, 30mA@12Vdc |
| 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 | IP30 |
| Dimension | 150mm×105mm×41mm (LxWxH) |
| 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 |
| NPS5431S | 4 Port Din-Rail RS485 Isolation Device Server, Modbus, MQTT Gateway, 10~30Vdc |