1-port RS-232/485/422 Serial Device Server

  • Support 1 serial port to 1 10/100Base-T(X) self-adaptive Ethernet interface
  • Support TCP Server, TCP Client, TCP Auto, UDP, Advanced TCP Server, Advanced UDP and other operating modes
  • Support 9~48VDC power supply input
  • Support -40~75℃ wide temperature operation


NP301 is the serial device server that can make serial device be equipped with networking capability instantly and centrally manage the scattered serial devices and hosts via network. The product supports 1 RS-232/RS-422 /RS-485 to 1 100M Ethernet copper port. It adopts wall mounting to meet the requirements of different application scenes.

Serial device server supports multiple network protocols, such as TCP, UDP, ARP, ICMP, HTTP, DNS and DHCP protocol. It also possesses complete management functions, including Access Control, Rapid Configuration, Online Upgrading and so on. Each serial port supports 4 TCP or UDP session connections, and it also supports TCP Server, TCP Client, TCP Auto, UDP, Advanced TCP Server, Advanced UDP operating modes and AT, WEB access modes. Furthermore, supplied management configuration tool based on Windows platform can guide the user to manage and configure the device, achieving immediate networking of serial device via simple settings. It can provide users with good experience with friendly design of network management system interface, simple and convenient operation.

Hardware adopts fanless, low power consumption, wide temperature and voltage design and has passed rigorous industrial standard tests, which can suit for the industrial scene environment with harsh requirements for EMC. It can be widely used in PLC control and management, Building Automation System, Health Care Automation System, measuring instrument and environmental forces monitoring system.

Features and Benefits

  • Adopt 32 bits ARM processor
  • Support 10/100Base-T(X) self-adaptive Ethernet interface
  • Support AUTO MDI/MDIX, which can be connected via crossover cable and straight-through cable
  • Support 300bps-115200bps line speed and non-blocking communication
  • Support low power consumption mode and high performance mode
  • Support TCP Server, TCP Client, TCP Auto, UDP, Advanced TCP Server and Advanced UDP operating mode
  • Support AT command, which is convenient for the secondary development of users
  • Support DNS, which can achieve communication via domain name
  • Support across gateway and routing communication
  • Support virtual serial port drive access mode and automatic connection recovery after network interruption
  • Flexible serial port data framing setting, which can satisfy user’s various demands for data packets segmentation
  • Support standard TCP/IP SOCKET application access
  • TCP supports multi-connection, which allows maximum 4 users to monitor or manage the serial device simultaneously
  • UDP supports single machine or multi-machine communication, which allows multiple users to monitor or manage the serial device simultaneously
  • Support Windows configuration tool, serial port, WEB and other configuration forms
  • Support local and remote system firmware upgrading

Ethernet Port


Standard: 10Base-T, 100Base-TX


Rate: 10/100M automatic flow control, MDI/MDI-X autotunning

Interface quantity: 1

Interface form: RJ45

Duplex mode: full/half duplex mode self-adaption

Operating mode: 4 sessions, support TCP Server, TCP Client, UDP, TCP Auto, Advanced TCP Server and Advanced UDP


Serial Port  

Standard: EIA RS-232C, RS-485, RS-422

Quantity of serial port: 1 RS-232 or RS-485/422 serial port

RS-232 signal: RXD, TXD, DTR, GND, DSR, RTS, CTS

RS-485 signal: D+, D-, GND

RS-422 signal: T+, T-, GND, R+, R-

Baud rate: 300-115200bps

Data bit: 5bit, 6bit, 7bit, 8bit

Parity bit: None, Even, Odd, Space, Mark

Stop bit: 1bit, 1.5bit, 2bit

Interface form: RS-232, adopt DB9 male;

                           RS-485/422, adopt 5 pins 5.08mm pitch terminal blocks

Directional control: RS-485 direction adopts data flow automatic control technology

Load capacity: RS-485/422 end supports 32 points polling (customizable 128 points)

Pull high/low resistor for RS-485: 4.7kΩ



WEB configuration management, serial port AT command, Windows configuration tool



Classification of User Permissions





Power supply indicator, Ethernet port indicator, serial port indicator





9~48VDC, 3 pins 5.08mm pitch terminal blocks

Support reverse polarity protection





No-load: 0.80W@12VDC

Full-load: 0.84W@12VDC





Operating temperature range: -40~75℃

Storage temperature range: -40~85℃

Relative humidity: 5%~95%(no condensation)





Housing: IP40 protection, metal

Installation: wall mounting

Dimension (W x H x D): 69mm×22mm×100mm

Weight: 240g





IEC 61000-4-2 (ESD, Electro-static Discharge) ,Level 3

Air discharge: ±8kV

Contact discharge: ±6kV


IEC 61000-4-4 (EFT/B, Electrical Fast Transient/Burst), Level 3

Power supply: ±2kV

Ethernet interface: ±1kV

Serial port: ±1kV


IEC 61000-4-5 (Surge), Level 2

Power supply: common mode ±2kV, differential mode ±1kV

Ethernet interface: ±2kV

Serial port: common mode ±1kV, differential mode ±1kV


Shock: IEC 60068-2-27

Free fall: IEC 60068-2-32

Vibration: IEC 60068-2-6






3 years


Available Models 100M Copper Port RS-232/485/422 Port Power Supply Range
NP301 1 1 9~48VDC