NPort Express Series

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

moxa-nport-express-series-image-2-(1).jpg | Moxa

moxa-nport-express-series-image-3-(1).jpg | Moxa

Features and Benefits

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

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Introduction

The NPort® DE-211 and DE-311 are 1-port serial device servers that support RS-232, RS-422, 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.

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No. of Ports

1
Magnetic Isolation Protection

1.5 kV (built-in)
10/100BaseT(X) Ports (RJ45 connector)

DE-311: Auto MDI/MDI-X connection
10BaseT(X) Ports, RJ45 Connector

DE-211: Auto MDI/MDI-X connection

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

Connector

DE-211: DB25 female
DE-311: DB9 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)

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

Input Current

DE-211: 180 mA @ 12 VDC, 100 mA @ 24 VDC
DE-311: 300 mA @ 9 VDC, 150 mA @ 24 VDC
Input Voltage

DE-211: 12 to 30 VDC
DE-311: 9 to 30 VDC

Alert Tools

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

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)

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)

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
Medical

DE-311: EN 55011: 2007+A2: 2007 Class A (Group 1) compliant
DE-311: EN 60601-1-2: 2007 compliant

Green Product

RoHS, CRoHS, WEEE

Time

DE-211: 347,822 hrs
DE-311: 225,529 hrs
Standards

MIL-HDBK-217F

Warranty Period

5 years
Details

See www.moxa.com/warranty

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Software, Firmware, and Drivers

Name	Type	Checksum	Version	Operating System	Release Date
Mova Windows Driver Manager (Windows 11 and Server 2022 and later, WHQL certified) 9.7 MB	Driver	6E42FAE04B3EBF87CECF448D2C027AE3A835D50118BD0A7E55488190404D5FE3ABE95BFB17E3B93E71B658C948D1A6EC91699128315EC9DEB245C571C7194247 SHA-512	v4.4	Windows 11 Windows Server 2022 Windows Server 2025	Oct 27, 2025 Oct 27, 2025 Release notes
PComm Lite - Serial Communication Tool 5.0 MB	Utility	1066E6330D870ABC9443C58DA8D65904F02AAA8E908E307687F3ABB7DE60DBFEB01C485304AA0B01F837FC91B9A55C5503570D7DAA4F6B873748726DE9EF9BD2 SHA-512	v1.8	Windows	Aug 27, 2025 Aug 27, 2025 Release notes
Moxa CLI Configuration Tool for Linux 11.6 MB	Utility	4003D7F9F6F7DC5F64893018AAE59AF552AAEDEEB0C917A7FD0279C5536AA0566F621F1625C3F96EE718284F78CAEA76C4D56E67C999797B88E6DBE5AA80B5B5 SHA-512	v1.5	Linux Kernel 2.6.x Linux Kernel 3.x Linux Kernel 4.x Linux Kernel 5.x Linux Kernel 6.x	Aug 05, 2025 Aug 05, 2025 Release notes
Real TTY Linux Kernel 5.x Driver 122.5 KB	Driver	3FCA6ED80C90576EDB52CB8B7386E5F2AB8F3AFC37B4BC40B7B5DB4EE94AA1AE99A2E9B9CA3E88E646D044D57E01796CE8460A471421C4A0CBC3CB88757669C4 SHA-512	v5.5	Linux Kernel 5.x	Mar 12, 2025 Mar 12, 2025 Release notes
Moxa CLI Configuration Tool for Linux 11.6 MB	Utility	3D62373F7694829FA7749638D64D20C2CD4F2D7F3752B33EA14C3BB5670AEF50450553BB69273BFA1730E0A88DC19212480B5F1C625C1499C83A0C52B04D1D3A SHA-512	v1.4	Linux Kernel 2.6.x Linux Kernel 3.x Linux Kernel 4.x Linux Kernel 5.x Linux Kernel 6.x	Nov 07, 2024 Nov 07, 2024 Release notes
Windows Driver Manager (Windows 7 to 10 and Windows Server 2008 R2 to 2019, WHQL certified) 8.9 MB	Driver	F1D2DC7185E059E0BCAB2F0E34BDB159EF7784BAF77B5EEF58D6A044ADAA062E42BB043ADA2FDC2F3F050EC7BE4687C33581DBE736961B14C3970271BE90BCDB SHA-512	v3.6	Windows 10 Windows 7 Windows 8 Windows 8.1 Windows Server 2008 R2 Windows Server 2012 Windows Server 2012 R2 Windows Server 2016 Windows Server 2019	Sep 22, 2024 Sep 22, 2024 Release notes
Real TTY Linux Kernel 6.x Driver 121.7 KB	Driver	B873EB6E994A39A008BBB8C0BEEA008A03D2588593C8A005FFCDD0F586981D45FD4415B0886279279A489DD0C86D37EB33B6E5CA11AC4511940D37015ADF4BE8 SHA-512	v6.1	Linux Kernel 6.x	Sep 05, 2024 Sep 05, 2024 Release notes
Serial Device Server Driver for macOS (macOS 11.x to 14) 6.3 MB	Driver	91948DC612A34FDCFAA923230297736427FB8217C04496AFB919C92099D2F9073F583B9334D8D0A8636CF4AA4D47767CF06E93AA9450C4A64CA77B4E6F14F417 SHA-512	v1.3	macOS 11 macOS 12 macOS 13 macOS 14	Sep 02, 2024 Sep 02, 2024 Release notes
Real TTY Linux Kernel 4.x Driver 123.3 KB	Driver	477816054CA50B3A86615B8DA1EC061199E1FC4A84C44111C181B8091C7022E8053CE0A0E07D0E3D35D57888BC812B11411B47FCE435E2933A26AB139BF5A47C SHA-512	v4.3	Linux Kernel 4.x	Aug 07, 2024 Aug 07, 2024 Release notes
Real TTY drivers for Linux 3.x.x 94.6 KB	Driver	EF31F576A53A8B2AF310DE6930D2BED12A9E6CDEDB518E4B63221C27DED29C24BCEBE0C0CD7E498FC5B840B1A0871AF7CF6D99C453DDB842B97EA4061DABA27E SHA-512	v3.0	Linux Kernel 3.x	Jul 04, 2024 Jul 04, 2024 Release notes
Serial Device Server Driver for macOS (macOS 10.1x to 14) 689.8 KB	Driver	5C6F5BCEE33A29CAAB95B4E267F7524063FB1EF33B433C727DD2E2193FAFC0981D792A374C9F79B9696824427B1C6438D54DEFAA4513FBE5E89ECDC14D077A9B SHA-512	v1.2	macOS 10.12 macOS 10.13 macOS 10.14 macOS 10.15 macOS 11 macOS 12 macOS 13 macOS 14	Nov 10, 2023 Nov 10, 2023 Release notes
Device Search Utility 2.2 MB	Utility	9F3E3C6A2BBDCBFC53A91CAA82372972B0A9888CB75C1F9F8E32324F50FF8A0FF7500417AB873469B00AE8C20EE6C0D0C8C50CB94BFC3517AE604879244440FD SHA-512	v2.7	Windows 10 Windows 11 Windows 2000 Windows 7 Windows 8 Windows 8.1 Windows 95 Windows 98 Windows 98 SE Windows NT Windows Server 2003 Windows Server 2008 Windows Server 2008 R2 Windows Server 2012 Windows Server 2012 R2 Windows Server 2016 Windows Server 2019 Windows Server 2022 Windows Vista Windows XP	Jun 28, 2023 Jun 28, 2023 Release notes
Device Server Android API 18.0 MB	Library	C60360A8734B5D261D9010D5772739C4BB92197E2E657E935F1AFB289DB9E3068AB542D83AC2D466477B30D0A57193427430FEDE60BC6C2E92852BDB987FDA21 SHA-512	v1.1	Android	Dec 22, 2022 Dec 22, 2022 Release notes
Serial Device Server Driver for macOS (macOS 10.12 to 10.15) 611.6 KB	Driver	BE32FE7D0CAC2F085B41604E1F6D29411F7EBA2E0D9D7D13DC1CC4D74012D585D307D33AE6D36D66BF1B756A3D5D6586F23D2020DD3B96BF2AAE8DACA151B370 SHA-512	v1.1	macOS 10.12 macOS 10.13 macOS 10.14 macOS 10.15	Sep 26, 2022 Sep 26, 2022 Release notes
Real TTY drivers for Linux 2.x.x 92.2 KB	Driver	E1DE344CAB9DC95DCCDABB25E0AC77EACB0D49C5E49E864DB555A4BFDFB94A8FDED968DE193943EA06A398654D5403BA0230EF36543589EF348D664A7002AE34 SHA-512	v2.0	Linux Kernel 2.4.x Linux Kernel 2.6.x	Oct 24, 2019 Oct 24, 2019 Release notes
Real TTY drivers for Linux 5.x.x 95.3 KB	Driver	A6D674B684B6619CEF4BFF2DD77CF1A1A1268D4B5F11C82C926A757AA72B162B55C7A7E3FFB93EC3CE3EB7FC23F7A64546D500DD21AB9726A562E080612982E5 SHA-512	v5.0	Linux Kernel 5.x	Oct 24, 2019 Oct 24, 2019 Release notes
Real TTY drivers for Linux 4.x.x 95.4 KB	Driver	BCDBD0AA80476ED2EDBF5094277BD5C6750F97C760F206008C9C6D796B202609C18B53A8D4786D6B03BDAF1836FF35754931587B93F7248EA0BBD829C43EAB40 SHA-512	v4.0	Linux Kernel 4.x	Oct 24, 2019 Oct 24, 2019 Release notes
Windows Driver Manager (Windows Vista, Server 2008, and prior) 2.6 MB	Driver	4340A70D93E824C9B6FF6034E3322BD0DE5FDAA27CC3BA2B0F0276DCF313AA1DE22B091610EF686F697774EE215AC0028EE0AB3239734334A49A6A1FEBE77804 SHA-512	v2.0	Windows 2000 Windows 95 Windows 98 Windows 98 SE Windows ME Windows NT Windows Server 2003 Windows Server 2008 Windows Vista Windows XP	Aug 01, 2019 Aug 01, 2019 Release notes
Firmware for NPort Express Series (DE-211) 152.6 KB	Firmware	678EAC72FC88F96172499AB2F4F54E6B2AD48F6AB658F7EDAD0B5E174927C5DCF1BA7531F49D1394C5C3429D78C45207C890B560C5EDF27D606142348B486059 SHA-512	v2.2		Jan 21, 2019 Jan 21, 2019 Release notes
Firmware for NPort Express Series (DE-311) 171.0 KB	Firmware	756EE2C57697955002518180688EA6D3A6222FABB580269C324140D422CFDBAE039AA2D3F32EA50957CB667696C3AB1FE8FC9202EA6AF6A292CAA6DB1ED676EC SHA-512	v3.0		Jan 21, 2019 Jan 21, 2019 Release notes
NPort Administration Suite 4.0 MB	Driver	C0B76C0D286BD31050D0F89D2B3022DDB7B3A53C19EADAFDBF20490F61B7E3B2E91A8098BB131AE3D698A0E66995C529AF827CEB21757F709B3A27163C920171 SHA-512	v1.22	Windows 10 Windows 2000 Windows 7 Windows 8 Windows 8.1 Windows 95 Windows 98 Windows ME Windows NT Windows Server 2003 Windows Server 2008 Windows Server 2008 R2 Windows Server 2012 Windows Server 2012 R2 Windows Vista Windows XP	Oct 27, 2016 Oct 27, 2016 Release notes
Driver for NPort Express Series (WinCE 5) 230.5 KB	Driver	00DD2467DE2439BBAADAA004964C685C92DA2495C38B2CCBEBDED8DBA035FA42E82AF4CFF8AEA4C80CC571CA46AAE1259E777F42E62CF813D3C8603E64507779 SHA-512	v1.6	Windows CE 5.0 Windows CE 6.0	Nov 14, 2012 Nov 14, 2012 Release notes
Driver for NPort Express Series (WinXP Embedded) 1.2 MB	Driver	51DC8EDE78353F3080BCDB8370EB56C4FEC50D814005DDE835072A4AD3B2FD4D08166EB5490E5C84F686D625004A05763FFD23787B0DF36DD93CF4AE95C4F358 SHA-512	v1.14	Windows XP Embedded	Apr 04, 2012 Apr 04, 2012 Release notes
Driver for NPort Express Series (UNIX) 73.0 KB	Driver	14B2FDD2D55F69D4910D6DDCA9B63C14AC9F818373889BCAD224327E710071A4269E16EB0DCAA0E107430A03BB974427473B170DA4DCB3BC07CF4C90A4D4A153 SHA-512	v3.5	FreeBSD 5.x FreeBSD 6.x FreeBSD 7.x FreeBSD 8.x HP-UX IBM AIX 5.3 Mac OS X QNX 4.x QNX 6.x SCO OpenServer 5 SCO OpenServer 6 SCO UnixWare 7 Solaris 10	Mar 19, 2012 Mar 19, 2012 Release notes

Support Documents

Name	Type	Version	Release Date
FOSS Statement for Moxa PComm Lite Suite for Windows 108.5 KB	Declaration	v1.0	Feb 07, 2025 Feb 07, 2025
FOSS Statement for Moxa CLI Configuration Tool 114.6 KB	Declaration	v1.0	Dec 10, 2024 Dec 10, 2024
Moxa CLI Configuration Tool User Manual 1.0 MB	Manual	v2.4	Nov 18, 2024 Nov 18, 2024
Device Search Utility v3.x User Manual 6.6 MB	Manual	v1.0	Oct 31, 2024 Oct 31, 2024
FOSS Statement for NPort macOS driver 108.4 KB	Declaration	v1.0	Oct 29, 2024 Oct 29, 2024
FOSS Statement for Device Search Utility 161.8 KB	Declaration	v1.0	Jun 24, 2024 Jun 24, 2024
Declaration of Conformity (EU/UK) for NPort Express Series (DE-211) 303.6 KB	Declaration	v1.0	Mar 04, 2024 Mar 04, 2024
Declaration of Conformity (EU/UK) for NPort Express Series (DE-311) 303.8 KB	Declaration	v1.0	Mar 04, 2024 Mar 04, 2024
Tech Note: TCP Client Mode for NPort 394.5 KB	Tech Note	v2.0	Jun 08, 2023 Jun 08, 2023
Tech Note: Moxa Real TTY Driver Porting Guide for Arm-based Platforms 372.3 KB	Tech Note	v2.0	Jun 08, 2023 Jun 08, 2023
Tech Note: UDP Mode for NPort 397.2 KB	Tech Note	v2.0	Jun 08, 2023 Jun 08, 2023
Tech Note: Ethernet Modem Mode 429.4 KB	Tech Note	v2.0	Jun 08, 2023 Jun 08, 2023
Tech Note: TCP Server Mode for NPort 395.0 KB	Tech Note	v2.0	Jun 08, 2023 Jun 08, 2023
Tech Note: Real TTY Driver for NPort 379.2 KB	Tech Note	v2.0	Jun 08, 2023 Jun 08, 2023
Tech Note: Reverse Telnet Mode for NPort 364.5 KB	Tech Note	v2.0	Jun 08, 2023 Jun 08, 2023
Tech Note: Fixed TTY Driver for NPort 389.7 KB	Tech Note	v2.0	Jun 08, 2023 Jun 08, 2023
Tech Note: Real COM mode for NPort 479.5 KB	Tech Note	v2.0	Jun 08, 2023 Jun 08, 2023
Tech Note: Pair Connection Mode 544.0 KB	Tech Note	v2.0	Jun 08, 2023 Jun 08, 2023
Tech Note: Accessing Multiple NPorts Behind NAT 497.2 KB	Tech Note	v2.0	Jun 08, 2023 Jun 08, 2023
FOSS Statement for NPort Windows Driver Manager 255.8 KB	Declaration	v1.0	Aug 01, 2022 Aug 01, 2022
Datasheet for NPort Express Series 824.5 KB	Datasheet	v1.4	Apr 23, 2022 Apr 23, 2022
Tech Note: Moxa Real TTY Driver Porting Guide for Arm-based Platforms 372.3 KB	Tech Note	v1.0	Aug 05, 2021 Aug 05, 2021
QIG for NPort Express Series (DE-211) 758.2 KB	QIG	v8.2	May 06, 2021 May 06, 2021
QIG for NPort Express Series (DE-311) 741.8 KB	QIG	v5.2	May 06, 2021 May 06, 2021
Tech Note: Real COM mode for NPort 423.5 KB	Tech Note	v1.1	Apr 30, 2020 Apr 30, 2020
Manual for NPort Express Series (DE-311 HIG) 2.6 MB	Manual	v5.0	Oct 02, 2017 Oct 02, 2017
Tech Note: NPort Real COM Mode for DNP3 Applications 1.9 MB	Tech Note	v1.0	Nov 17, 2014 Nov 17, 2014
Tech Note: TCP Server Mode for NPort 311.3 KB	Tech Note	v1.0	Jun 29, 2013 Jun 29, 2013
Manual for NPort Express Series (DE-211 HIG) 2.3 MB	Manual	v8.0	Feb 20, 2013 Feb 20, 2013
Tech Note: Using DNP3 with the NPort Series 1.0 MB	Tech Note	v1.0	Mar 29, 2012 Mar 29, 2012
Tech Note: NPort's Ethernet Modem Mode 116.6 KB	Tech Note	v1.0	Nov 03, 2009 Nov 03, 2009
Tech Note: TCP Client Mode for NPort 224.4 KB	Tech Note	v1.0	Nov 03, 2009 Nov 03, 2009
Tech Note: NPort's Pair Connection Mode 211.4 KB	Tech Note	v1.0	Nov 03, 2009 Nov 03, 2009
Tech Note: UDP Mode for NPort 173.2 KB	Tech Note	v1.0	Nov 03, 2009 Nov 03, 2009
Tech Note: Real COM Mode for NPort 253.0 KB	Tech Note	v1.0	Nov 03, 2009 Nov 03, 2009
Tech Note: Accessing Multiple NPorts Behind NAT 482.6 KB	Tech Note	v1.0	Nov 03, 2009 Nov 03, 2009
Tech Note: Reverse Telnet Mode for NPort 204.6 KB	Tech Note	v1.0	Nov 03, 2009 Nov 03, 2009
Manual for NPort Express Series 474.3 KB	Manual	v3.0	Oct 14, 2009 Oct 14, 2009
2D CAD for NPort DE-311 TOP 483.5 KB	2D CAD		May 22, 2009 May 22, 2009
2D CAD for NPort DE-211 TOP 26.0 KB	2D CAD		May 22, 2009 May 22, 2009
Tech Note: Fixed TTY Driver for NPort 207.6 KB	Tech Note	v1.0	May 21, 2009 May 21, 2009
Tech Note: Real TTY Driver for NPort 204.2 KB	Tech Note	v1.0	May 21, 2009 May 21, 2009

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Available Models (2)

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	Compare DE-311	Compare DE-211
Ethernet Port Speed	10/100 Mbps	10 Mbps
Serial Connector	DB9 female	DB25 female
Power Input	9 to 30 VDC	12 to 30 VDC
Medical Certifications	EN 60601-1-2 Class B, EN 55011	–
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