1-port Embedded Serial Device Server Module

  • Support 1 serial port to 1 10/100 Base-T(X) self-adaptive Ethernet port
  • Support TCP Server, TCP Client, TCP Auto, UDP, Advanced TCP Server, Advanced UDP and other operating modes
  • Input voltage: 3.3VDC
  • Support -40~75℃ wide operating temperature range


NPM301 is a high performance embedded serial port to Ethernet module, it supports 1 RS-232, RS-422 or RS-485 to 1 100M Ethernet port. The module can easily achieve networking of embedded device, which can save lots of cost for research and development and accelerate the products release.

Serial port baud rate of the module is 300-115200bps. It supports TCP Server, TCP Client, TCP Auto, UDP and Real COM operating mode. It supports maximum 4 TCP/UDP connections and domain name access.

All settings of NPM301 are achieved via serial port or network. It can be used as communication processor between serial device and PC or used for remote communication among multiple serial devices. 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 10/100 Base-T(X) self-adaptive Ethernet port
  • Support AUTO MDI/MDIX, connectable to crossover cable or straight through cable
  • Support 300bps-115200bps line speed non-blocking communication
  • Support low power consumption mode and high performance mode
  • Support TCP Server, TCP Client, TCP Auto, UDP and Real COM driver operating mode, operating port, destination IP address and port can all be configured
  • Operating port, destination IP address and port can be configured
  • Built-in WEB server, which is convenient for user to conduct webpage configuration
  • Support AT command, which is convenient for the user secondary development
  • Support DNS to meet the requirements of achieving communication via domain name
  • Support virtual serial port drive access mode and automatic connection recovery after network interruption
  • Support flexible serial port data frame segmentation to meet user’s demand for message segmentation
  • Support SOCKET operating mode (TCP Server, TCP Client, UDP)
  • TCP supports multiple connections, so maximum four users can manage an embedded module device at the same time
  • Support single or multiple machine communication under UDP mode, so multiple users can simultaneously manage an embedded module device
  • Support SOCKET, serial port and WEB configuration
  • Support local and remote system software upgrading





System Information

32 bits ARM inner core

Standard: 10/100Base-T(X)

Protocol: support TCP, UDP, ARP, HTTP, DHCP and DNS protocol

Speed: 10/100M

Operating mode: full duplex or half duplex



WEB configuration management, WINDOWS hyper terminal, BlueEyes_II management software



User permission classification


Serial device server  

1-port serial device server, support 4 TCP or UDP session connections; Multiple operating modes: TCP Server, TCP Client, UDP, TCP auto, Realcom, advanced TCP Server and advanced UDP


Ethernet port  

1 100M Ethernet port


Serial port  


Baud rate: 300-115200bps

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

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

Stop bit: 1bit, 1.5bit, 2bit



Interface indicator





3.3VDC (±5%)





Operating temperature: -40~75℃

Storage temperature: -40~85℃

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


Physical Characteristic  

Type: pin type independent module

Size (W×H×D): 32.5mm×13.8mm×25mm (with pins)

Pin header: 14 pins on the left row, 14 pins on the right row, pin header spacing is 2mm

Weight: 9g






3 years


Available Models 100M Ethernet port RS-232/RS-422/RS-485 Power Supply Range
 NPM301 1 1 3.3VDC (±5%)