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Source for VMEbus, PMC Modules, CompactPCI, Single Board Computers, Rackmount Servers, and Rackmount Chassis

NPort Express DE-211 ] NPort Express DE-311 ]


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8/16-Port Serial Device Servers
4-Port Serial Device Servers
1-Port Serial Device Servers
Embedded Serial Device Servers

Board Ordering Information


1-Port Serial Device Servers


Detailed Info

NPort DE-211
Universal Serial Device Server for
Industrial Devices
  • 3-in-1 RS-232/422/485 interface and 10 Mbps Ethernet
  • Supports 4 and 2 wire RS-485 with patented ADDC™ and built-in terminator
  • Supports industrial 12/24 VDC power input and optional Power over Serial
  • Terminal block accessories for easy RS-422/485 serial wiring
  • Supports MAC based IP configuration
  • Supports configuration store and copy for easy deployment
  • Supports Windows Native COM driver and Linux real TTY driver
  • Supports Real COM Mode, TCP Server/Client, UDP Server/Client, Ethernet Modem, Pair Connection


Detailed Info

NPort DE-311
Make Your Serial Devices Internet Ready
  • Auto-detecting 10/100Mbps Ethernet
  • 3-in-1 RS-232/422/485 serial interfaces
  • Cigarette pack size for easy integration
  • Built-in Ethernet and TCP/IP protocol supporting TCP Server, TCP Client, UDP Server/Client, Ethernet Modem, Pair connection
  • Supports Windows Native COM drivers and Linux fix/real tty driver


Make Your Serial Devices Internet Ready™

In the automation industry, tens of millions of sensors, gauges, PLCs, card readers, and other devices must be connected to form a control network and provide managerial data for information systems. The most widely used interfaces for connecting such devices are RS-232 and RS-422/485.

In recent years, network infrastructures such as Ethernet and Internet have received wide recognition in the automation industry. The trend has been towards adopting a mature, open technology, such as TCP/IP and Ethernet, for controlling serial devices. Device manufacturers and device users are both looking for an instant solution to transform and connect devices to the Ethernet/Internet.

MOXA NPort Express provides just such an INSTANT solution, giving you a way to link traditional devices that have an RS-232/422/485 interface with the Ethernet/Internet.

How to Make Your Serial Devices Internet Ready™ INSTANTLY

To change a serial device into a network-enabled device can take much time and effort, considering the development and integration required for the CPU, DSP, TCP/IP protocol, and real time operating system.

But now it is no longer necessary to invest extra manpower on TCP/IP and Ethernet development. MOXA NPort Express provides off-the-shelf solutions that utilize a serial device’s existing RS-232/422/485 port and make your devices Internet ready INSTANTLY.

MOXA provides two ways to bring this about

External Solution: NPort DE-311/211
This is a 1-port device server that’s designed to convert data from the RS-232/422/485 interface to a form suitable for 10/100 Mbps TCP/IP Ethernets.

Check out our Embedded Solution: NPort DE-311M
This is an RS-232/TTL to Ethernet, board-level OEM product that device manufactures can easily integrate into their products.



  • Intrance control and security/attendance management
  • Manufacturing automation
  • Telecom and fiber optic network management
  • Industrial control and process control
  • Hospital/Laboratory automation
  • Remote image transmission

How a PC uses NPort Express to Access Serial Data

Two approaches are available to access serial data:






Driver Access

By using Moxa's NPort Native COM driver, NPort Express's serial port can be set up to emulate a remote COM port. In this case, there is no need to modify software or communications objects. The solution can be used immediately with NPort Express's serial port, and is applicable to all Windows platforms, as well as Linux/Unix systems that have driver support.

Socket Access

Use TCP/IP sockets to access serial data via a specific NPort Express TCP port. This solution is applicable to any system that has TCP/IP connectivity. In addition, MOXA provides several operation modes and features that use socket access, such as:


  • TCP Server: allows passive TCP connections for your serial device
  • TCP Client: actively sends serial data to the network
  • UDP Server/Client: provides UDP based fast data packet transmission and multi-destination data transmission for serial devices
  • Ethernet Modem: provides NPort Express with AT command simulation, for use with legacy DOS software over an Ethernet
  • Pair Connection: provides data tunneling over an Ethernet, for use with any type of serial device
  • Data Packing: the data packing facility inhibits data segmentation





An Industrial Partner 1999-2002. All rights reserved.

CompactPCI, Embedded SBCs, Flat panel Displays, Industrial Chassis, IndustrialPC Peripherals, Industrial Power Supplies, Backplanes, Single Board Computers, Rackmount Servers, Network Communication, Open Frame Panel Computer, PC/104, Flash Disk, CTI, RAID Back to Home CompactPCI, Embedded SBCs, Flat panel Displays, Industrial Chassis, IndustrialPC Peripherals, Industrial Power Supplies, Backplanes, Single Board Computers, Rackmount Servers, Network Communication, Open Frame Panel Computer, PC/104, Flash Disk, CTI, RAID E-Mail

VoxTechnologies Corp. - Industrial Computer Leader
1-972-234-4343 Fax: 1-972-234-4295 Toll-Free: 1-888-568-6224

For over a decade, VoxTechnologies has been a leading source of industrial computers and complete system products for the O.E.M. and Systems Integrator. Our primary goal is to provide a solution source for engineers that have the challenging task of interfacing and controlling the real world.

Telephone: 1-972-234-4343 General Info: Sales Info:
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Copyright © 1999 VoxTechnologies Corporation- An Industrial Partner
Last modified: June 20, 2002