SE5904D SDK Series

4-Port Industrial Ethernet to Serial Embedded Computer

  • Ideal for IoT and IIoT applications.
  • Wide -40°C~85°C temperature range for Industrial-grade reliability
  • 2 x 10/100Mbps Ethernet port or 2x 100/1000 SFP slot
  • 4 x RS-232/422/485 port – models available with or without isolation
  • 1 x USB2.0 high speed OTG port
  • Optional 802.3af PoE models can be powered by Ethernet cable
  • ATOP customized Linux SDK environment with reliable APIs
  • Rugged metal housing with wall or DIN-Rail mount support
  • Industrial EMC protection


SE5904D SDK Series
SE5904D SDK Series
SE5904D SDK Series
SE5904D SDK Series
SE5904D SDK Series
SE5904D SDK Series
SE5904D SDK Series
SE5904D SDK Series
SE5904D SDK Series
SE5904D SDK Series

Providing connectivity for the Internet of Things
ATOP’s Industrial Embedded Computer is your ideal flexible Gateway to the Internet of Things. It provides Serial and Ethernet connectivity, redundant power input and a relay output in a reliable and powerful Industrial Grade platform that can unlock your potential. Based on your specific application, it allowing almost any serial device to be connected, providing and retrieving the data you need to and from the cloud, no matter what provider you’re using.


Write your customized application in C language and Run it on its powerful Industrial low-power 800MHz ARM Cortex A8 TI Sitara AM3354 CPU. Make flexible use of your peripherals, no matter storage, Serial, or USB are needed.
SE5904D is available as a SDK/BSP. The SDK development environment reserves the maximum flexibility. Bottom to top editable software architecture allowed easily to customize or add the IoT applications for different using scenarios. Included Linux kernel source extend the capability of the kernel layer. Changeable WEB pages allowed to easily customize proprietary style. With the SE5904D, it will extend your possibility while building your IoT applications.


Rugged and flexible for advanced developments
SE5904D embeds high EMC protection, wide temperature operation, programming and installation flexibility in one device. A dedicated PoE version allows you to power on the device through Power over Ethernet (IEEE802.3af) without the need of separate and space consuming power supply. SFP version enhances the device providing long range fiber optic connectivity capability, in the need of a stable and remote fiber connection.


SE5904D (SDK) block diagram



The IoT (Internet of Things) or IIoT (Industrial Internet of Things) is a trending topic these days. It’s all about bringing devices, sensors, actuators, data and commands to the cloud, with the ultimate goal to improve the quality of life, the services Smart Cities can offer, saving energy or saving money. This requires two things: to vehiculate the collected data to the cloud in a format that can be recognized and processed and to process, compute and analyze all this amount of data in real time.
It is not a concept far from reality. Imagine you’d like to bridge a Modbus Sensor to the cloud. And you’d like to have the application running on the cloud to be able to process multiple sensors’ data, and to trigger some event in some specific stations along the network. You may also have the need to override the cloud control and manage the application locally. Any application has its story.

Here at ATOP, we understand these different needs and we are providing you different working models, based on what your needs are.


Use the Standard SDK, programmable embedded computer if:

  • You are familiar with Linux OS
  • You have ANSI C programming skills
  • Your application is strictly time/ performance sensitive
  • Your application has very critical exception handling requirements


Our SDK products provide:

  • Ported, proven and tested peripherals (such as  I/Os, Ethernet, Serial, Relays) and integrated drivers
  • ATOP customized Linux Kernel and network protocols
  • Ported, debugged and proven third party applications
  • Utilities and APIs to control the hardware in an easy and effective way
  • Opened software architecture to create your own system image
  • Linux source code to extend the kernel capability
  • Modifiable WEB contents to customize proprietary WEB style
  • Example of source code









Hardware Specifications 
CPUTexas Instruments Sitara ARM Cortex A8 AM3354 800MHz
Flash32 MB NOR Flash
Real Time Clock (RTC)Yes - with external chip
Console portYes - on-board connector
Reset ButtonYes
Network Interface 
StandardsIEEE 802.3 for 10BaseT
IEEE 802.3u for 100BaseT(X) and 100BaseF(X)
IEEE 802.3z for 1000Base-X
Ethernet Ports2x 10/100 Mbps RJ-45 or
2x 100/1000 Mbps SFP slot (SFP version)
Power over Ethernet IEEE 802.3af on LAN2 (PoE version only)
Serial Interface 
ConnectorD-Sub9 RS-232/485 software selectable (DB model)
5-Pin 5.08mm Terminal Block (TB and SiS model)
Ports4 port RS-232/422/485 (2 and 4-wire) + 1 RJ45 console port
Serial Port Isolation3 kV (SiS version only)
Pull-high / Pull-low /Term. resistorsSoftware Selectable
Baud Rate50 ~ 921,600bps
Data Bits7, 8
Stop Bits1, 2
Flow ControlNone, Xon/Xoff, RTS/CTS (RS-232 only)
Other interfaces 
USB ports1 x USB A Type (USB 2.0) - internal 1-port High-Speed OTG + power
BootloaderU-boot 2014.07
Linux kernelLinux 3.14.26
Linux toolchainLinux 32 bits toolchain gcc (C/C++ PC cross compiler), glibc
Linux sample codeRS232, RS485, RTC, watchdog, LED, Buzzer, Button, network socket
Input Voltage12~48 VDC
IEEE802.3 af (PoE) through LAN 2 - PoE version only
Power RedundancyYes, 2 independent power inputs
Relay Output1x 1A@30VDC (Normal open)
Connector7-Pin 5.08mm Lockable Terminal Block
Power Consumption0.65A @ 9VDC (6 W Max)
Reverse Polarity ProtectionYes
Operating Temperature-40°C~85°C (-40°F~185°F)
Storage Temperature-40°C~85°C (-40°F~185°F)
Ambient Relative Humidity5%~95%, (Non-condensing)
HousingIP30 protection, SPCC metal housing
Dimensions(W x H x D)55 x 145 x 113 mm
InstallationDIN-Rail or Wall-Mount (optional kit)
Reset ButtonYes
SafetyIEC/EN 61010-1, UL61010-1, IEC/EN 61010-2-201, UL61010-2-201, EN62368-1
EMCFCC Part 15, Subpart B, Class A

EN 55032, EN 55024, EN 61000-3-2, EN 61000-3-3, EN 61000-6-2, EN 61000-6-4
IEC 61000-4-2ESDContact Discharge±6kV3
IEC 61000-4-2ESDAir Discharge±8kV3
IEC 61000-4-3RSRadiated (enclosure)10 V/m3
IEC 61000-4-4EFTDC Power Port±2.0kV3
IEC 61000-4-4EFTSignal Port±2.0KV4
IEC 61000-4-5SurgeDC Power PortLine-to Line±1.0KV3
IEC 61000-4-5SurgeDC Power PortLine-to Earth±1.0KV3
IEC 61000-4-5SurgeSignal PortLine-to Earth±2.0KV3
IEC 61000-4-6CSConducted (enclosure)10 Vrms3
IEC 61000-4-8PFMFEnclosure 30 A/m4
ShockMIL-STD-810G Method 516.7
Drop (Freefall)MIL-STD-810G Method 516.7
VibrationMIL-STD-810G Method 514.7
MTBF14.56 Years (according to MIL-HDBK-217F)
Warranty5 Years
SE5904D-4P-DB1P1SE5904D000BGInd. 4-Port Serial Device Server, 10/100BASET(X), DB9
SE5904D-4P-TB1P1SE5904D000CGInd. 4-Port Serial Device Server, 10/100BASET(X), TB5
SE5904D-4P-Sis1P1SE5904D000DGInd. 4-Port Ser. Dev. Serv,10/100BASET(X), 3kV Isolated
SE5904D-4P-PoE-DB1P1SE5904D0008GInd. 4-Port Ser. Dev. Serv, 10/100BASET(X)with PoE, DB9
SE5904D-4P-PoE-TB1P1SE5904D0009GInd. 4-Port Ser. Dev. Serv, 10/100BASET(X)with PoE, TB5
SE5904D-4P-PoE-Sis1P1SE5904D000AGInd. 4-Port Ser. Dev. Serv, RJ45, PoE, 3kV Isolated
Please note the following
suffixes to be added to he
chosen model name:
SDK version: (SDK)
SDR-75-2450500752240001G75W/3.2A DIN-Rail 24VDC power supply with 88~264VAC / 124~370VDC input
CBL-RJ45(8P)-DB9(F)-90-C50891971G8-pin RJ45-DB9 debug cable, 90cm
ADP-DB9(F)-TB559906231GFemale DB9 to Female 3.81 TB5 Converter
GDC-12059906861G120mm copper woven grounding cable
WMK-450-Black70100000000052GAluminum wall mount kit


Version Name Time Size Download
v1.0 Linux_Driver_x64 2021-03-29 210.16 KB


Version Name Time Size Download
v2.01 SE5904D SDK Firmware 2021-03-03 11.02 MB


Version Name Time Size Download
v0.9 Datasheet EN 2023-12-25 419.46 KB
v0.8 Datasheet EN 2023-11-01 385.74 KB
v0.7 Datasheet EN 2021-03-03 562.62 KB
v0.4 Datasheet EN 2018-08-24 707.46 KB
v0.3 Datasheet EN 2018-05-18 721.47 KB
v0.2 Datasheet EN 2017-11-10 714.04 KB


Version Name Time Size Download
v1.2 SE59XX SDK User Manual 2018-05-02 2.25 MB
v1.1 SE59XX SDK User Manual 2018-02-05 2.41 MB
v0.1 AWS Getting started guide 2021-08-19 907.53 KB
v0.5 SE59XX SDK User Manual 2021-04-13 2.55 MB
v1.4 SE59XX Node-RED User Manual 2019-04-22 5.72 MB
v1.2 SE59XX Node-RED User Manual 2018-08-24 5.59 MB

Hardware Installation Guide

Version Name Time Size Download
v1.1 SE5904D/MB5904D/PG5904D Hardware Installation Guide 2016-03-23 3.81 MB

STP/DXF drawings

Version Name Time Size Download
v1.0 STP file PG-SE-MB5904D 2022-07-06 1.87 MB

Test reports

Version Name Time Size Download
v1.0 SE-MB-PG5904D Certifications CE_FCC 2019-11-20 3.59 MB
v1.0 SE-MB-PG5904D Certifications EN61000-6-2&4 2019-11-20 6.11 MB
v1.0 SE-MB-PG5904D Certifications Environmental 2019-11-20 4.6 MB
v1.0 SE-MB-PG5904D Certifications LVD 2019-11-20 3.62 MB
v1.0 SE-MB-PG5904D Certifications UL 2019-11-20 157.83 KB

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