Moxa
NE-4120A

NE-4120A

NE-4100 Series

10/100 Mbps embedded serial device servers

  • 10/100 Mbps Ethernet interface
  • Supports baudrates up to 230.4 kbps
  • Choice of operation modes: Real COM, TCP Server, TCP Client, and UDP
  • Supports DHCP, BootP, Static IP, and ARP
  • SNMP and email alerts for event trapping and notifications
  • Half the size of a credit card—only 57 × 40 mm
  • Low power consumption at 1.5 W, with single +5 V input

Certifications CE · FCC

Get a QuoteContact Sales

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

Specifications

Platform

CPU
16-bit MCU

Memory

Flash
2 MB
SDRAM
1 MB

Input/Output Interface

Configurable DIO Channels (by software)
4

Ethernet Interface

10/100BaseT(X) Ports, Auto MDI/MDI-X
5-pin pin header
Magnetic Isolation Protection
1.5 kV (built-in)
Standards
IEEE 802.3 for 10BaseT IEEE 802.3u for 100BaseT(X) IEEE 802.3x for flow control

Ethernet Software Features

Configuration Options
Web Console (HTTP), Windows Utility, Telnet Console, Serial Console
Management
ARP, Device Search Utility (DSU), DHCP Client, HTTP, IPv4, SMTP, SNMPv1/v2c, TCP/IP, Telnet, UDP, Web Console, ICMP
Windows Real COM Drivers
Windows 95/98/ME/NT/2000, Windows XP/2003/Vista/2008/7/8/8.1/10 (x86/x64), Windows 2008 R2/2012/2012 R2/2016/2019 (x64), Windows Embedded CE 5.0/6.0, Windows XP Embedded
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

Serial Interface

No. of Ports
2 (1 for serial interface, 1 for TTL console port)
Serial Standards
RS-422, RS-485
Operation Modes
Real COM mode, TCP Client mode, TCP Server mode, UDP mode
Baudrate
110 bps to 230.4 kbps
Data Bits
5, 6, 7, 8
Stop Bits
1, 1.5, 2
Parity
None, Even, Odd, Space, Mark
Flow Control
None, RTS/CTS, DTR/DSR, XON/XOFF

Serial Signals

RS-422
Tx+, Tx-, Rx+, Rx-, GND
RS-485-4w
Tx+, Tx-, Rx+, Rx-, GND
RS-485-2w
Data+, Data-, GND

Power Parameters

Input Voltage
5 VDC
Power Consumption
290 mA @ 5 VDC

Physical Characteristics

Dimensions
57 x 40 mm (2.24 x 1.57 in)
Weight
20 g (0.04 lb)
Form Factor Type
Ready-to-go pin header modules

Environmental Limits

Operating Temperature
0 to 55°C (32 to 131°F)
Storage Temperature (package included)
-40 to 60°C (-40 to 140°F)
Ambient Relative Humidity
5 to 95% (non-condensing)

Standards and Certifications

EMC
EN 55032/24
EMI
CISPR 32, FCC Part 15B Class A
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 61000-4-6 CS: 150 kHz to 80 MHz: 3 V/m; Signal: 3 V/m IEC 61000-4-8 PFMF
Environmental Testing
IEC 60068-2-1 IEC 60068-2-3 IEC 60068-2-14

Declaration

Green Product
RoHS, CRoHS, WEEE

MTBF

Time
289,573 hrs
Standards
Telcordia SR332

Warranty

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

Documentation

NameTypeVersionDate
Real TTY Linux Kernel 6.x Driver2.5 MBDriverv6.2Jan 22, 2026 Jan 22, 2026 Release notes
Real TTY Linux Kernel 4.x Driver650.0 KBDriverv4.4Jan 22, 2026 Jan 22, 2026 Release notes
Real TTY Linux Kernel 5.x Driver650.0 KBDriverv5.6Jan 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 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
Windows Driver Manager (for Windows 7, Windows Server 2008 or later)5.2 MBDriverv3.3Jan 25, 2021 Jan 25, 2021 Release notes
Windows Driver Manager (for Windows 7, Server 2008, or later))3.0 MBDriverv3.2Jul 06, 2020 Jul 06, 2020 Release notes
Network Enabler SDK5.0 MBUtilityv2.9Dec 06, 2019 Dec 06, 2019 Release notes
Network Enabler Administrator923.4 KBUtilityv2.11Dec 06, 2019 Dec 06, 2019 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
Driver for NE-4100 Series (TTY driver for Unix)73.0 KBDriverv3.5Mar 20, 2019 Mar 20, 2019 Release notes
Windows Driver Manager (Windows Vista, Server 2008, and prior)2.6 MBDriverv2.0Aug 23, 2018 Aug 23, 2018 Release notes
Driver for NE-4100 Series (WinCE 5)230.5 KBDriverv1.6Nov 14, 2012 Nov 14, 2012 Release notes
PComm Lite - Serial Communication Tool for Windows1.6 MBUtilityv1.6May 13, 2012 May 13, 2012 Release notes
Driver for NE-4100 Series (WinXP Embedded)1.2 MBDriverv1.14Apr 04, 2012 Apr 04, 2012 Release notes
Software Package for NE-4100 Series (DIO Tester)111.3 KBSoftware Packagev2.1Sep 27, 2009 Sep 27, 2009 Release notes
Library for NE-4100 Series (NECI)485.0 KBLibraryv2.3.0Sep 01, 2008 Sep 01, 2008 Release notes
Firmware for NE-4100 Series454.9 KBFirmwarev4.1Jul 08, 2008 Jul 08, 2008 Release notes
Device Search Utility v3.x User Manual2.8 MBManualv1.1Nov 17, 2025
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 for NE-4100 Series304.9 KBDeclarationv1.0Apr 23, 2024
Tech Note: TCP Server Mode for NPort395.0 KBTech Notev2.0Jun 08, 2023
Tech Note: Real COM mode for NPort479.5 KBTech Notev2.0Jun 08, 2023
Tech Note: Pair Connection Mode544.0 KBTech Notev2.0Jun 08, 2023
Tech Note: Ethernet Modem Mode429.4 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: Fixed TTY Driver for NPort389.7 KBTech Notev2.0Jun 08, 2023
Tech Note: Accessing Multiple NPorts Behind NAT497.2 KBTech Notev2.0Jun 08, 2023
Tech Note: Real TTY Driver for NPort379.2 KBTech Notev2.0Jun 08, 2023
FOSS Statement for NE-4100, NE-4100-ST Series135.1 KBDeclarationv1.0Feb 24, 2023
FOSS Statement for Moxa Windows Driver Manager255.8 KBDeclarationv1.0Aug 01, 2022
Manual for NE-4100 Series15.6 MBManualv11.1Jul 26, 2022
Manual for NE-4100 Series (Serial command mode)1.1 MBManualv2.1Jul 26, 2022
Tech Note for NE-4100 Series (circuit design recommendations)1.0 MBTech Notev12.1Jul 26, 2022
Tech Note: Moxa Real TTY Driver Porting Guide for Arm-based Platforms372.3 KBTech Notev1.0Aug 05, 2021
QIG for NE-4100 Series499.4 KBQIGv5.2May 19, 2021
Datasheet for NE-4100 Series499.7 KBDatasheetv1.3Jun 24, 2020
Tech Note: Real COM mode for NPort423.5 KBTech Notev1.1Apr 30, 2020
Network Enabler 2 SDK Programmer's Guide688.2 KBManualv5.0Dec 13, 2019
Network Enabler 2 SDK API Reference385.8 KBManualv8.0Dec 13, 2019
2D CAD for NE-4100T TOP357.6 KB2D CAD—May 19, 2016
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
Tech Note: NPort's Ethernet Modem Mode116.6 KBTech Notev1.0Nov 03, 2009
Tech Note: TCP Client Mode for NPort224.4 KBTech Notev1.0Nov 03, 2009
Tech Note: NPort's Pair Connection Mode211.4 KBTech Notev1.0Nov 03, 2009
Tech Note: Accessing Multiple NPorts Behind NAT482.6 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: Reverse Telnet Mode for NPort204.6 KBTech Notev1.0Nov 03, 2009
Tech Note: Fixed TTY Driver for NPort207.6 KBTech Notev1.0May 21, 2009
Tech Note: Real TTY Driver for NPort204.2 KBTech Notev1.0May 21, 2009
2D CAD for NE-4120S-A TOP242.7 KB2D CAD—Aug 03, 1995
2D CAD for NE-4110S-A TOP391.1 KB2D CAD—Aug 03, 1995

Other models in the NE-4100 Series

NE-4100T
NE-4100T
NE-4100T-T
NE-4100T-T
NE-4110A
NE-4110A
NE-4110A-T
NE-4110A-T
NE-4110S
NE-4110S
NE-4110S-T
NE-4110S-T
NE-4120A-T
NE-4120A-T
NE-4120S
NE-4120S
NE-4120S-T
NE-4120S-T