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









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
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)
Input Voltage12~48 VDC
IEEE802.3 af (PoE) through LAN 2 - PoE version only
Power RedundancyYes, 2 independent power inputs
Relay Output1x [email protected] (Normal open)
Connector7-Pin 5.08mm Lockable Terminal Block
Power Consumption0.65A @ 9VDC (6 W Max)
Reverse Polarity ProtectionYes
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
Other interfaces 
USB ports1 x USB A Type (USB 2.0) - internal 1-port High-Speed OTG + power
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)
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)
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
IEC 61000-4-2ESDContact Discharge±8kV4
IEC 61000-4-2ESDAir Discharge±15kV4
IEC 61000-4-3RSRadiated (enclosure)10 V/m3
IEC 61000-4-4EFTAC Power Port±2.0kV3
IEC 61000-4-4EFTSignal Port±2.0KV4
IEC 61000-4-5SurgeAC Power PortLine-to Line±1.0KV3
IEC 61000-4-5SurgeAC Power PortLine-to Earth±2.0KV3
IEC 61000-4-5SurgeSignal PortLine-to Earth±2.0KV3
IEC 61000-4-6CSConducted (enclosure)10 Vrms3
IEC 61000-4-8PFMFEnclosure 10 A/m3
IEC 61000-4-11DIPPower Port--
SafetyUL61010-2-201, EN62368
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
ShockIEC 60068-2-27
DropIEC 60068-2-32
VibrationIEC 60068-2-64
MTBF14.56 Years (according to MIL-HDBK-217F)
Warranty5 Years
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
SE5904D-4P-DBContact HeadquarterInd. 4-Port Serial Device Server, 10/100BASET(X), DB9
SE5904D-4P-TBContact HeadquarterInd. 4-Port Serial Device Server, 10/100BASET(X), TB5
SE5904D-4P-SisContact HeadquarterInd. 4-Port Ser. Dev. Serv,10/100BASET(X), 3kV Isolated
SE5904D-4P-PoE-DBContact HeadquarterInd. 4-Port Ser. Dev. Serv, 10/100BASET(X)with PoE, DB9
SE5904D-4P-PoE-TBContact HeadquarterInd. 4-Port Ser. Dev. Serv, 10/100BASET(X)with PoE, TB5
SE5904D-4P-PoE-SisContact HeadquarterInd. 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)