Moxa
DE-211

DE-211

NPort Express Series

1-port entry-level RS-232/422/485 serial device servers

  • 3-in-1 serial port: RS-232, RS-422, or RS-485
  • Variety of 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 Automatic Data Direction Control (ADDC)

Certifications UL Listed · CE · FCC

Get a QuoteContact Sales

Ships from and sold by A5 IT, an authorized Moxa reseller.

Specifications

Ethernet Interface

No. of Ports
1
Magnetic Isolation Protection
1.5 kV (built-in)
10BaseT(X) Ports, RJ45 Connector
Auto MDI/MDI-X connection

Ethernet Software Features

Configuration Options
Windows Utility, Telnet Console, Serial Console
Management
ARP, BOOTP, DHCP Client, IPv4, TCP/IP, Telnet, UDP, ICMP
Linux Real TTY Drivers
Kernel versions: 2.4.x, 2.6.x, 3.x, 4.x, and 5.x
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
Android API
Android 3.1.x and later
Windows Real COM Drivers
Windows 95/98/ME/NT/2000, Windows XP/2003/Vista/2008/7/8/8.1/10/11 (x86/x64), Windows 2008 R2/2012/2012 R2/2016/2019 (x64), Windows Server 2022, Windows Embedded CE 5.0/6.0, Windows XP Embedded

Serial Interface

Connector
DB25 female
Serial Standards
RS-232, RS-422, RS-485
No. of Ports
1
Baudrate
Supports standard baudrates (unit=bps): 50, 75, 110, 134, 150, 300, 600, 1200, 1800, 2400, 4800, 7200, 9600, 19200, 38400, 57600, 115200, 230.4k
Data Bits
5, 6, 7, 8
Stop Bits
1, 1.5, 2
Parity
None, Even, Odd, Space, Mark
Flow Control
None, RTS/CTS, XON/XOFF
RS-485 Data Direction Control
ADDC (automatic data direction control)

Serial Signals

RS-232
TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND
RS-422
Tx+, Tx-, Rx+, Rx-, RTS+, RTS-, CTS+, CTS-, GND
RS-485-2w
Data+, Data-, GND

Power Parameters

Input Current
180 mA @ 12 VDC 100 mA @ 24 VDC
Input Voltage
12 to 30 VDC

Reliability

Alert Tools
Built-in buzzer and RTC (real-time clock)

Physical Characteristics

Housing
Metal
Dimensions (with ears)
90.2 x 100.4 x 22 mm (3.55 x 3.95 x 0.87 in)
Dimensions (without ears)
67 x 100.4 x 22 mm (2.64 x 3.95 x 0.87 in)
Weight
480 g (1.06 lb)

Environmental Limits

Operating Temperature
0 to 55°C (32 to 131°F)
Storage Temperature (package included)
-40 to 75°C (-40 to 167°F)
Ambient Relative Humidity
5 to 95% (non-condensing)

Standards and Certifications

EMC
EN 55032/35
EMI
CISPR 32, FCC Part 15B Class B
EMS
IEC 61000-4-2 ESD: Contact: 4 kV; Air: 8 kV IEC 61000-4-3 RS: 80 MHz to 1 GHz: 3 V/m IEC 61000-4-4 EFT: Power: 1 kV; Signal: 0.5 kV IEC 61000-4-5 Surge: Power: 1 kV IEC 61000-4-5 Surge: Power: 1 kV; Signal: 1 kV IEC 61000-4-6 CS: 150 kHz to 80 MHz: 10 V/m; Signal: 10 V/m IEC 61000-4-6 CS: 150 kHz to 80 MHz: 3 V/m; Signal: 3 V/m IEC 61000-4-11
Safety
UL 60950-1

Declaration

Green Product
RoHS, CRoHS, WEEE

MTBF

Time
347,822 hrs
Standards
MIL-HDBK-217F

Warranty

Warranty Period
5 years
Details
See www.moxa.com/warranty

Documentation

NameTypeVersionDate
Moxa CLI Configuration Tool (Windows)2.1 MBUtilityv1.6Feb 02, 2026 Feb 02, 2026 Release notes
Real TTY Linux Kernel 6.x Driver2.5 MBDriverv6.2Jan 22, 2026 Jan 22, 2026 Release notes
Real TTY Linux Kernel 5.x Driver650.0 KBDriverv5.6Jan 22, 2026 Jan 22, 2026 Release notes
Real TTY Linux Kernel 4.x Driver650.0 KBDriverv4.4Jan 22, 2026 Jan 22, 2026 Release notes
Moxa Windows Driver Manager (Windows 7 to 10 and Windows Server 2008 R2 to 2019, WHQL certified)12.2 MBDriverv3.8Jan 09, 2026 Jan 09, 2026 Release notes
Moxa Windows Driver Manager (Windows 11 and Server 2022 and later, WHQL certified)11.9 MBDriverv4.5Jan 09, 2026 Jan 09, 2026 Release notes
PComm Lite - Serial Communication Tool5.3 MBUtilityv1.9Dec 12, 2025 Dec 12, 2025 Release notes
Device Search Utility (installer)236.2 MBUtilityv3.1Nov 17, 2025 Nov 17, 2025 Release notes
Device Search Utility (portable)128.6 MBUtilityv3.1Nov 17, 2025 Nov 17, 2025 Release notes
Real TTY Linux Kernel 5.x Driver122.5 KBDriverv5.5Mar 12, 2025 Mar 12, 2025 Release notes
Real TTY Linux Kernel 6.x Driver121.7 KBDriverv6.1Sep 05, 2024 Sep 05, 2024 Release notes
Serial Device Server Driver for macOS (macOS 11.x to 14)6.3 MBDriverv1.3Sep 02, 2024 Sep 02, 2024 Release notes
Real TTY Linux Kernel 4.x Driver123.3 KBDriverv4.3Aug 07, 2024 Aug 07, 2024 Release notes
Real TTY drivers for Linux 3.x.x94.6 KBDriverv3.0Jul 04, 2024 Jul 04, 2024 Release notes
Serial Device Server Driver for macOS (macOS 10.1x to 14)689.8 KBDriverv1.2Nov 10, 2023 Nov 10, 2023 Release notes
Device Search Utility2.2 MBUtilityv2.7Jun 28, 2023 Jun 28, 2023 Release notes
Device Server Android API18.0 MBLibraryv1.1Dec 22, 2022 Dec 22, 2022 Release notes
Serial Device Server Driver for macOS (macOS 10.12 to 10.15)611.6 KBDriverv1.1Sep 26, 2022 Sep 26, 2022 Release notes
Real TTY drivers for Linux 5.x.x95.3 KBDriverv5.0Oct 24, 2019 Oct 24, 2019 Release notes
Real TTY drivers for Linux 2.x.x92.2 KBDriverv2.0Oct 24, 2019 Oct 24, 2019 Release notes
Real TTY drivers for Linux 4.x.x95.4 KBDriverv4.0Oct 24, 2019 Oct 24, 2019 Release notes
Windows Driver Manager (Windows Vista, Server 2008, and prior)2.6 MBDriverv2.0Aug 01, 2019 Aug 01, 2019 Release notes
Firmware for NPort Express Series (DE-311)171.0 KBFirmwarev3.0Jan 21, 2019 Jan 21, 2019 Release notes
Firmware for NPort Express Series (DE-211)152.6 KBFirmwarev2.2Jan 21, 2019 Jan 21, 2019 Release notes
NPort Administration Suite4.0 MBDriverv1.22Oct 27, 2016 Oct 27, 2016 Release notes
Driver for NPort Express Series (WinCE 5)230.5 KBDriverv1.6Nov 14, 2012 Nov 14, 2012 Release notes
Driver for NPort Express Series (WinXP Embedded)1.2 MBDriverv1.14Apr 04, 2012 Apr 04, 2012 Release notes
Driver for NPort Express Series (UNIX)73.0 KBDriverv3.5Mar 19, 2012 Mar 19, 2012 Release notes
Moxa CLI Configuration Tool User Manual850.9 KBManualv2.5Feb 12, 2026
Device Search Utility v3.x User Manual2.8 MBManualv1.1Nov 17, 2025
FOSS Statement for Moxa PComm Lite Suite for Windows108.5 KBDeclarationv1.0Feb 07, 2025
FOSS Statement for Moxa CLI Configuration Tool114.6 KBDeclarationv1.0Dec 10, 2024
FOSS Statement for NPort macOS driver108.4 KBDeclarationv1.0Oct 29, 2024
FOSS Statement for Device Search Utility161.8 KBDeclarationv1.0Jun 24, 2024
Declaration of Conformity (EU/UK) for NPort Express Series (DE-311)303.8 KBDeclarationv1.0Mar 04, 2024
Declaration of Conformity (EU/UK) for NPort Express Series (DE-211)303.6 KBDeclarationv1.0Mar 04, 2024
Tech Note: Real TTY Driver for NPort379.2 KBTech Notev2.0Jun 08, 2023
Tech Note: Moxa Real TTY Driver Porting Guide for Arm-based Platforms372.3 KBTech Notev2.0Jun 08, 2023
Tech Note: Ethernet Modem Mode429.4 KBTech Notev2.0Jun 08, 2023
Tech Note: Pair Connection Mode544.0 KBTech Notev2.0Jun 08, 2023
Tech Note: Fixed TTY Driver for NPort389.7 KBTech Notev2.0Jun 08, 2023
Tech Note: Real COM mode for NPort479.5 KBTech Notev2.0Jun 08, 2023
Tech Note: Accessing Multiple NPorts Behind NAT497.2 KBTech Notev2.0Jun 08, 2023
Tech Note: Reverse Telnet Mode for NPort364.5 KBTech Notev2.0Jun 08, 2023
Tech Note: TCP Client Mode for NPort394.5 KBTech Notev2.0Jun 08, 2023
Tech Note: UDP Mode for NPort397.2 KBTech Notev2.0Jun 08, 2023
Tech Note: TCP Server Mode for NPort395.0 KBTech Notev2.0Jun 08, 2023
FOSS Statement for Moxa Windows Driver Manager255.8 KBDeclarationv1.0Aug 01, 2022
FOSS Statement for Moxa Linux Driver1.7 MBDeclarationv1.0May 01, 2022
Datasheet for NPort Express Series824.5 KBDatasheetv1.4Apr 23, 2022
Tech Note: Moxa Real TTY Driver Porting Guide for Arm-based Platforms372.3 KBTech Notev1.0Aug 05, 2021
QIG for NPort Express Series (DE-211)758.2 KBQIGv8.2May 06, 2021
QIG for NPort Express Series (DE-311)741.8 KBQIGv5.2May 06, 2021
Tech Note: Real COM mode for NPort423.5 KBTech Notev1.1Apr 30, 2020
Manual for NPort Express Series (DE-311 HIG)2.6 MBManualv5.0Oct 02, 2017
Tech Note: NPort Real COM Mode for DNP3 Applications1.9 MBTech Notev1.0Nov 17, 2014
Tech Note: TCP Server Mode for NPort311.3 KBTech Notev1.0Jun 29, 2013
Manual for NPort Express Series (DE-211 HIG)2.3 MBManualv8.0Feb 20, 2013
Tech Note: Using DNP3 with the NPort Series1.0 MBTech Notev1.0Mar 29, 2012
Tech Note: Reverse Telnet Mode for NPort204.6 KBTech Notev1.0Nov 03, 2009
Tech Note: NPort's Pair Connection Mode211.4 KBTech Notev1.0Nov 03, 2009
Tech Note: Real COM Mode for NPort253.0 KBTech Notev1.0Nov 03, 2009
Tech Note: UDP Mode for NPort173.2 KBTech Notev1.0Nov 03, 2009
Tech Note: TCP Client Mode for NPort224.4 KBTech Notev1.0Nov 03, 2009
Tech Note: NPort's Ethernet Modem Mode116.6 KBTech Notev1.0Nov 03, 2009
Tech Note: Accessing Multiple NPorts Behind NAT482.6 KBTech Notev1.0Nov 03, 2009
Manual for NPort Express Series474.3 KBManualv3.0Oct 14, 2009
2D CAD for NPort DE-211 TOP26.0 KB2D CAD—May 22, 2009
2D CAD for NPort DE-311 TOP483.5 KB2D CAD—May 22, 2009
Tech Note: Real TTY Driver for NPort204.2 KBTech Notev1.0May 21, 2009
Tech Note: Fixed TTY Driver for NPort207.6 KBTech Notev1.0May 21, 2009

Other models in the NPort Express Series

DE-311
DE-311