NPort Express DE-211


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
10M and 100M Ethernet speeds detected automatically
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.

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
Serial Line Protection 15 KV ESD protection for all signals
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 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, IP, ICMP, ARP
Configuration Options Serial Console, Telnet Console, Windows Utility
Windows Real COM Drivers Windows (7/XP/2003/Vista/2008 x86/x64, 2000, 98/ME/NT), Embedded CE 5.0/6.0, XP Embedded
Fixed TTY Drivers SCO Unix, SCO OpenServer, UnixWare 7, UnixWare 2.1, SVR 4.2, QNX 4.25, QNX 6, Solaris 10, FreeBSD, AIX 5.x, HP-UX 11i
Linux Real TTY Drivers Linux kernel 2.4.x, 2.6.x, 3.x
Physical Characteristics
Housing Metal, IP30 protection
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 85°C (-40 to 185°F)
Ambient Relative Humidity 5 to 95% (non-condensing)
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


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