2-Port Serial to Ethernet Serial Device Server with Metal Case (RS-422/485)

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NCOM-21X-M is a network-based serial device server. It is designed to control your serial devices located virtually anywhere through a TCP/IP or UDP/IP network connection. The serial device server can map TCP/IP connections and UDP broadcasts to a virtual serial port. Applications include accessing a faraway device for functions such as remote control and data transmission. NCOM-21X-M serves as a transparent virtual serial port without limitations on operating systems and distances. The virtual serial port redirection uses the protocol known as RFC2217.

NCOM-21X-M supports several operation modes, including Driver mode, RFC2217 Server/Client mode, Pair Connection mode, TCP Server/Client mode and UDP mode. It also supports Windows virtual serial port driver, allowing you to add two virtual serial ports in your Windows system to work over a TCP/IP network. The virtual serial port functions as a native Windows COM port and is compatible with Windows serial communication applications. It is installed in the Device Manager of the operating system. This in turn will allow communications with the connected serial device in the same manner as a device physically connected to the COM port on a PC. The serial port supports high serial speeds up to 921.6Kbps in RS-232 for NCOM-211-M, RS-422/485 for NCOM-212-M and RS-232/RS-422/485 for NCOM-213-M.


  • Adds two virtual serial COM port via network connection
  • Fully supports the “COM Port Control” protocol known as RFC2217
  • Supports network protocols such as TCP and UDP client/server
  • Serial port operation mode can be easily changed via our Windows utility software or the web console interface
  • Firmware upgradable for future firmware revisions
  • Supports virtual serial port driver for Windows OS (Windows XP up to Windows 10)
  • Supports pair connection mode for connecting two serial device servers over a network without a PC
  • Easy-to-use Windows utility software for easy configuration and installation
  • 10/100Mbps Ethernet with auto-detection
  • Configuration via web console interface or utility software
  • Windows utility software automatically finds NCOM devices on the network
  • Supports “reset” button for system reset and restoring to default settings
  • Data rates: 300bps to 921.6Kbps
  • Auto transmit buffer control for 2-wire RS-485 half-duplex operation
  • Termination resistors installed on-board
  • Supported RS-422, RS-485 4-wire signals: TxD-, TxD+, RxD+, RxD-
  • Supported RS-485 2-wire signals: data-, data+
  • LEDs indicating Ethernet port’s link and speed statuses
  • LEDs indicating serial port’s TxD and RxD statuses
  • Virtual serial port drivers for Windows 10, 8.1, 8, 7, Vista, 2003, XP
  • Built-in 15kV ESD protection for all serial signals


Ethernet Interface
Speed/Type100Mbps/10Mbps Auto-detecting
ConnectorRJ45 (8P8C) 8 pin
LEDsEthernet Link / Speed
Serial interface
Number of Ports2
Serial PortRS-422/485
ConnectorDB9 male connector
RS-422 SignalsTxD-, TxD+, RxD+, RxD-, GND
RS-485 Signals 4-wireTxD-, TxD+, RxD+, RxD-, GND
RS-485 Signals 2-wireData-, Data+, GND
Baudrate921.6kbps for serial data transmission & reception
Data Bits5, 6, 7, 8
ParityNone, Even, Odd, Mark, Space
Stop Bit1, 1.5, 2
Flow ControlHardware (RTS, CTS)
Protection15kV ESD for all signals
DriversWindows 2000 up to Windows 10
Windows Server 2000 up to 2018
UtilityNCOM management tool for Windows OS
Power Requirement
Power Input9VDC to 48VDC
Power Consumption180mA@12VDC, 80mA@48VDC
Operating Temperature0°C to 55°C (32°F to 131°F)
Storage Temperature-20°C to 75°C (-4°F to 167°F)
Operating Humidity5% to 95% RH
Safety ApprovalsCE, FCC
Dimensions95 × 71 × 22 mm (L × W × H)
100  × 91  × 22 mm with DB-9 connector and ears (L × W × H)


Product Manual