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NPort Express DE-211

1 port RS-232/422/485 serial device server

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Features and Benefits 

  • 3-in-1 serial port: RS-232, RS-422, or RS-485
  • Versatile operation modes, including TCP Server, TCP Client, UDP, Ethernet Modem, and Pair Connection
  • Real COM/TTY drivers for Windows and Linux
  • 2-wire RS-485 with patented Automatic Data Direction Control (ADDC®)
  • Built-in 15 kV ESD protection for all serial signals



The NPort® DE-211 and DE-311 are 1-port serial device servers that support RS-232, RS-422, 4-wire RS-485, and 2-wire RS-485. The DE-211 supports 10 Mbps Ethernet connections and has a DB25 female connector for the serial port. The DE-311 supports 10/100 Mbps Ethernet connections and has a DB9 female connector for the serial port.
Both device servers are ideal for applications that involve information display boards, PLCs, flow meters, gas meters, CNC machines, and biometric identification card readers.




Pin Assignment

Ethernet Interface
Number of Ports 1
Speed NPort DE-211: 10 Mbps, auto MDI/MDIX
NPort DE-311: 10/100 Mbps, auto MDI/MDIX
Connector 8-pin RJ45
Magnetic Isolation Protection 1.5 kV built-in
Serial Interface
Number of Ports 1
Serial Standards RS-232/422/485 (selectable by DIP Switch)
Connector NPort DE-211: DB25 female
NPort DE-311: DB9 female
RS-485 Data Direction Control ADDC® (automatic data direction control)
Serial Communication Parameters
Data Bits 5, 6, 7, 8
Stop Bits 1, 1.5, 2
Parity None, Even, Odd, Space, Mark
Flow Control RTS/CTS, XON/XOFF
Baudrate 150 bps to 230.4 kbps
Serial Signals
RS-422 DE-211: Tx+, Tx-, Rx+, Rx-, GND
DE-311: Tx+, Tx-, Rx+, Rx-, RTS+, RTS-, CTS+, CTS-, GND
RS-485-4w Tx+, Tx-, Rx+, Rx-, GND (DE-211 only)
RS-485-2w Data+, Data-, GND
Network Protocols DHCP, BOOTP, Telnet, TCP, UDP, IPv4, ICMP, ARP
Configuration Options Serial Console, Telnet Console, Windows Utility
Windows Real COM Drivers Windows 95/98/ME/NT/2000, Windows XP/2003/Vista/2008/7/8/8.1 (x86/x64), Windows 2008 R2/2012/2012 R2 (x64), Windows Embedded CE 5.0/6.0, Windows XP Embedded
Fixed TTY Drivers SCO Unix, SCO OpenServer, UnixWare 7, QNX 4.25, QNX 6, Solaris 10, FreeBSD, AIX 5.x, HP-UX 11i, Mac OS X
Linux Real TTY Drivers Linux 2.4.x, 2.6.x, 3.x, 4.x
Physical Characteristics
Housing Metal
Weight 480 g
Dimensions Without ears: 67 x 100.4 x 22 mm (2.64 x 3.95 x 0.87 in)
With ears: 90.2 x 100.4 x 22 mm (3.55 x 3.95 x 0.87 in)
Environmental Limits
Operating Temperature 0 to 55°C (32 to 131°F)
Storage Temperature -40 to 75°C (-40 to 167°F)
Ambient Relative Humidity 5 to 95% (non-condensing)
Altitude Up to 2000 m
Note Please contact Moxa if you require products guaranteed to function properly at higher altitudes.
Power Requirements
Input Voltage DE-211: 12 to 30 VDC
DE-311: 9 to 30 VDC
Power Consumption NPort DE-211: 180 mA @ 12 V, 100 mA @ 24 V
NPort DE-311: 300 mA @ 9 V, 150 mA @ 24 V
Standards and Certifications
Safety UL 60950-1, EN 60950-1
EMI EN 55022 Class B, FCC Part 15 Subpart B Class A
EMS EN 55024
Medical EN 60601-1-2 Class B, EN 55011 (DE-311 only)
MTBF (mean time between failures) NPort DE-211: 347,822 hrs
NPort DE-311: 225,529 hrs
Warranty Period 5 years
Details See www.moxa.com/warranty

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Available Models

  Model No. Description
DE-211 1-port RS-232/422/485 device server with 10 Mbps Ethernet connection

Optional Accessories

Wiring Terminals
  Model No. Description
TB-M9 DB9 male DIN rail wiring terminal
Other Accessories
  Model No. Description
NP21103 DB25 terminal block kit for RS-422/485
NP21102 Male DB25 to male DB9 RS-232 cable; 30 cm
NP21101 DB25(M) to DB9(F) RS-232 Cable, 30 cm
Mounting Kits
  Model No. Description
DK35A DIN-Rail Mounting Kit (35 mm)

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