Microsoft Windows Embedded Partner - WEPP


Industrial I/O Control PCIe Card
with 4-port RS-232/422/485
8+8-ch Isolated Digital I/O

Main features 

Board Level:

  • Designed to meet PCI Express Base Specification Revision 2.1.
  • With high reliable SUNIX QiuNiu UART Digital-I/O controller.
  • Plug-n-Play, I/O address and IRQ assigned by system.
  • Ultra low power consumption ( <1.5W) design for green environment and industrial application.
  • High quality electronic components, low impedance and high stability ensure product quality and reliability.
  • Support Microsoft Windows 10 with C and C# programming language sample code.
  • Capable of engaging with EdgeX device C SDK for EdgeX service development.
  • Support Node-RED serial and Modbus communication module.
  • Certified by CE, FCC, RoHS, and Microsoft approvals.
  • Support both standard and Low profile bracket design to meet various of PC chassis.

 Serial Communication:

  • Expands internal two (2) ports RS-232/422/485 and external two (2) ports RS-232/422/485.
  • Utilize 16C950 UART and on-chip 128-bytes hardware FIFO for reliable, high-speed serial communication.
  • RS-232/422/485 interface and 120Ω terminal resistor configured by software.
  • On-chip patented AHDC/CS hardware auto flow control to guarantee no data loss.
  • 2KV surge protection for all serial signals meets IEC-61000-4-5.

Digital I/O Communication:

  • Expands isolated eight (8) digital input channels with features for all channels.
    • Support both NPN & PNP devices
    • Support both dry and wet contact connections
    • With digital filter for noise reduction
    • Built-in 32-bit counter for all digital in channels
  • Expands isolated eight (8) NPN type digital output channels with initial value (Booting & Restart) protection.
  • Each channel built-in 2.5KV isolation protection for signal and power, allowing the input signals to be completely floated so as to prevent ground loops.


SUNIX SDC4880B, industrial RS-232/422/485 and isolated digital I/O PCI-Express add-on card, is designed for PC-based IoT Gateway or desktop that enables data acquisition, I/O controls and serial communication in industrial automation. This board built-in SUNIX UART & Digital-I/O controller, QiuNiu, and also built with many of SUNIX advanced features and technologies. In addition, SUNIX provides API software and SDK library, allowing users to program under Windows 10 operating systems. The software package includes a dynamic library.dll, C and C# programming language sample code, making it easier to develop application software. SUNIX SDC4880B board enriches I/O expandable capacity with cost-efficient design; it is the best serial and digital I/O communicating solution for lite-industrial applications.

20210312175159 sdc feat 4880



Board Communication
Interface PCI Express
Controller SUNIX QiuNiu UART Digital-I/O Controller
BUS PCI Express Gen1 x 1 (single lane)
IRQ & IO Assigned by System
ESD Protection ±15KV IEC61000-4-2 Air Gap Discharge
±8KV IEC61000-4-2 Contact Discharge
Serial Communication
Interface RS-232/422/485
No. of Port 4-port
Controller 16C950 UART Compatible
Data bit 5, 6, 7, 8
FIFO 128byte Hardware
Parity even, odd, none, mark, space
Baud Rate 50bps ~921.6Kbps
Flow Control RS-232: CTS/RTS (hardware),
DTR/DSR (hardware), Xon/Xoff (software)
RS-422/485: Xon/Xoff (software)
Terminator 120Ω
IRQ & IO Assigned by System
Surge Protection 2KV Surge (Meets IEC61000-4-5 requirement)
Signal RS-232: TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND, RI
RS-422: TxD+, TxD-, RxD+, RxD-, GND
RS-485: Data+, Data-, GND
PCB Connector 2 ports on DB44 Female connector ; 2 ports on pitch 1.0 pin header connectors
Digital Input Communication
Type NPN & PNP
Channel 8-channel
Dry Contact Logic Level 0: Open;
Logic Level 1: Close to GND
Wet Contact Logic Level 0: 0 to 3VDC;
Logic Level 1: 10 to 50VDC
Input Resistance 10KΩ
Isolation 2500 VDC
Frequency Input Range 2KHz with Isolation
Pin Define DI1~DI8, COM, GND
Counter 32-bit counter for all channel
Interrupt Mode Event trigger (Rising Edge, Falling Edge, Both modes) & polling for all channels
Noise Reduction Digital Filter
PCB Connector DB44 Female Connector
Digital Output Communication
Type NPN
Channel 8-channel
Voltage Range 3.5 to 40VDC
Current 500mA per Channel
Isolation 2500 VDC
Pin Define DO1~DO8, PWR, GND
Initial Protection Initial Value Setup (Booting & Restart protection) 
PCB Connector DB44 Female Connector
Software Support

Windows 10 (X86/X64)


Library: DLL for Windows supporting C, C++, C# languages.
Support C, C# sample code available                   

Third Party Software

Support Node-RED serial and Modbus communication module.
Capable of engaging with EdgeX device C SDK for EdgeX service development.                   

Regulatory Approvals


Green Product


Operation Temperature

-20 to 70°C (-4 to 158°F)

Operation Humidity 5 to 95% (non-condensing)

Storage Temperature

-20 to 70°C (-4 to 158°F)

PCB Dimension

146 x 68.5 mm

Bracket Standard 121 mm / Low Profile 79.2mm

Bracket Space