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AC-Si5037D

Sunix SER5037D 2-port RS-232 Universal PCI Serial Remap Board

Sunix - Sunix 5037D - 2 port serial (16c550), 32/64bit 3.5/5V pci card pci, 32byte hardware + 128k software FiFo, sunix UL7512EQ chipset, 115.2Kbps, support Re-Map to legacy ISA address 2E8, 3E8, 2F8, 3F8 mapping (under DOS and Win9x/NT OS), 2KV ESD protection
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Specials
Prices, images and descriptions are for reference purposes only & may change without prior notice. PLEASE RELY ON ABOVE DESCRIPTIONS AND NOT ON IMAGES. AC-Si5037D Sunix SER5037D 2-port RS-232 Universal PCI Serial Remap Board is available from Laptop Direct and it is sold as new from our Multi I/O PCI interface range of products. For reference purposes, the price of R770 is valid 2026-09-13, and while stocks last, may be valid until . The price displayed is a guide for reference purposes only, and may change without prior notice. Reference prices are an invitation for potential buyers to make an offer to purchase, which we may reject without reason. A quote with final pricing is sent before a purchase can be made. T&C's apply. E&OE. Laptop Direct. You are looking at products found in the Multi I/O PCI interface category.
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Specification for the entire series

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AC-Si5037D

Sunix SER5037D 2-port RS-232 Universal PCI Serial Remap Board

Sunix 5037D - 2 port serial (16c550), 32/64bit 3.5/5V pci card pci, 32byte hardware + 128k software FiFo, sunix UL7512EQ chipset, 115.2Kbps, support Re-Map to legacy ISA address 2E8, 3E8, 2F8, 3F8 mapping (under DOS and Win9x/NT OS), 2KV ESD protection

About this product

The Sunix 5037D is a reliable 2 port PCI serial expansion card designed for legacy and industrial systems that require stable RS-232 communication. Built on the Sunix UL7512EQ chipset, it delivers consistent data transfer up to 115.2Kbps with advanced FIFO buffering and robust 2KV ESD protection.

Overview Summary

Sunix 5037D 2 Port PCI Serial Card

The Sunix 5037D PCI serial card adds two high quality serial ports to desktop systems using a standard 32-bit PCI interface. It supports both 3.5V and 5V PCI slots, making it compatible with a wide range of legacy and modern motherboards used in industrial, automation, and embedded environments.

Featuring a 16C550 compatible controller with 32 byte hardware FIFO and 128K software FIFO, this card ensures smooth data flow even in demanding serial communication tasks. Legacy ISA address re-mapping support allows seamless integration with older DOS, Windows 9x, and Windows NT based systems.

What tier does this fall into?

Entry-level industrial I O

What is this best for?

Industrial automation, POS systems, CNC machines, serial modems, legacy hardware integration

Overview

SUNIX SER5037D, Universal PCI serial communication board, allows users to add or expand dual RS-232 ports on PC-based system. The card is compatible with both 64 / 32-bit PCI architecture supporting 3.3 and 5V Bus, allowing it to be installed in any slim size PC-based system with low profile bracket structure. SUNIX SER5037D card has 32-bytes onboard FIFO buffer and compatible with 16C650 UART specification. Besides users can remap to legacy ISA address 2E8, 3E8, 2F8, 3F8 address under DOS and Win9x/NT O.S. SUNIX GoldenIO card series is designed with SUNIX UART controller, UL7512EQ and as well built with many of SUNIX advanced features and technologies, making it the best solution for commercial and industrial automation applications.

Description

The Sunix 5037D is engineered for environments where dependable serial communication is essential. Using a proven Sunix UL7512EQ chipset, it supports two RS-232 serial ports through a standard PCI interface, ensuring long term compatibility with legacy and industrial systems.

Its advanced buffering architecture combines a 32 byte hardware FIFO with a 128K software FIFO to reduce CPU load and prevent data loss during high traffic communication. With support for legacy ISA address mapping, the card is well suited for applications that rely on fixed COM port addressing under DOS and early Windows operating systems.

Integrated 2KV ESD protection enhances durability and stability, making the Sunix 5037D a dependable solution for factories, workshops, and embedded system deployments.

Features

The Sunix 5037D delivers practical features focused on reliability and legacy compatibility.

  • 2 x RS-232 serial ports via PCI interface
  • Sunix UL7512EQ chipset for stable communication
  • 16C550 compatible controller
  • 32 byte hardware FIFO with 128K software FIFO
  • Supports 32-bit PCI, 3.5V and 5V slots
  • Data transfer speeds up to 115.2Kbps
  • Legacy ISA address re-mapping support for 2E8, 3E8, 2F8, 3F8
  • Compatible with DOS, Windows 9x, and Windows NT systems
  • Built-in 2KV ESD protection for enhanced durability

What's in the Box

  • Sunix 5037D 2 Port PCI Serial Card
  • Low profile or standard bracket (if supplied by manufacturer)
  • Quick installation guide

Specifications

© 2026 Respective owners and brand holders. This table has been carefully researched and generated by Laptop Direct CC (https://www.laptopdirect.co.za), however, errors and omissions may occur. Only references to South Africa apply. All products are sourced in South Africa from the official suppliers and the warranty is that of the local supplier. E&OE. This table and our site's content may be used on condition that this notice and link remains intact and unaltered.
Specifications and features
Product Code AC-Si5037Dspacer
Serial Communication
Interface RS-232
Controller SUNIX UL7512EQ (16C650 UART Compatible)
BUS Universal PCI 64 / 32bit 3.3V / 5V PCI Ver 3.0, 2.3, 2.2, 2.1
No. of Port 2port
IRQ & IO Assigned by System
FIFO 32byte Hardware
Signal DCD, TxD, RxD, RTS, CTS, DTR, DSR, GND, RI
Baud rate 50bps ~115.2Kbps
Stop bit 1, 1.5, 2
Parity even, odd, none, mark, space
Flow Control None, Xon / Xoff, RTS / CTS
Protection ±2KV ESD protection for each signal Human Body Model (HBM)
PCB Connector DB9 Male
Driver Support
Windows Client 9x / NT / XP / Vista / 7 / 8 / 8.1 (X86 / X64)
Windows Server 2000 / 2003 / 2008 / 2008 R2 / 2012 / 2012 R2 (X86 / X64)
Windows Embedded XP Embedded / POSReady 2009 / POSReady 7 / Embedded System 2009
Linux Linux 2.4.x / 2.6.x
DOS DOS
* FreeBSD FreeBSD 5.3~5.5 / 6.0~6.4
* QNX QNX 6.3.2 / 6.4.0
* IBM OS / 2 WARP 3 / WARP 4
* SCO UnixWare UnixWare 7.1.3 / 7.1.4 / Open Server 5.0.7 / 6.0
* Sun Microsystems Solaris 10
Note : " * " Supported by special inquiry.
Regulatory Approvals
Hardware CE EN55022 Class B, EN55024, EN61000-3-2, EN61000-3-3, VCCI Class B
FCC Part 15 Class B, BSMI: CNS13438, C-Tick: CISPR22 AS / NZS, RoHS
Software Microsoft WHQL Windows
Windows Client: XP / Vista / 7 / 8 / 8.1 (X86 / X64)
Windows Server: 2000 / 2003 / 2008 / 2008 R2 / 2012 / 2012 R2 (X86 / X64)
Environment
Operation Temperature 0 to 60degreesC (32 to 140degreesF)
Operation Humidity 5 to 95% RH
Storage Temperature -20 to 85degreesC (-4 to 185degreesF)
Dimension
PCB Dimension 120 x 78 mm
Bracket Standard 121mm
Bracket Space 1

FAQ

What systems is the Sunix 5037D compatible with

The Sunix 5037D is compatible with systems that have a standard 32-bit PCI slot and supports both 3.5V and 5V PCI configurations.

Does this serial card support legacy COM port addresses

Yes, it supports re-mapping to legacy ISA addresses including 2E8, 3E8, 2F8, and 3F8 for compatibility with older software.

What operating systems are supported

The card is designed for use with DOS, Windows 9x, and Windows NT operating systems.

Is this card suitable for industrial environments

Yes, the integrated 2KV ESD protection and stable chipset make it suitable for industrial and embedded applications.

What is the maximum supported serial speed

The Sunix 5037D supports serial communication speeds up to 115.2Kbps.

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