PCI 4 Port Serial/RS232 Card (4S) W-954-4S – Versatile Multi-Channel Expansion

Reliable Four-Port Serial Expansion for Professional Systems

PCI 4 Port Serial/RS232 Card (4S) W-954-4S is designed to add multiple serial communication channels to a compatible computer through a standard PCI interface. It is suitable for projects that require several RS232 devices to communicate with one host system, including industrial control equipment, point-of-sale terminals, laboratory instruments, access-control systems, data-acquisition devices, automation machines, and legacy peripheral installations.

The card complies with PCI Bus Specification 2.2 and Power Management 1.0. It supports four full-duplex asynchronous communication channels and is software compatible with 16C450, 16C550, 16C650, 16C750, and 16C950 UART environments. This compatibility helps system integrators maintain established serial communication platforms while expanding the number of available ports.

Key Features of W-954-4S PCI Serial Card

Technical Specification Summary

Advanced Data Handling and Flow Control

Each transmitter and receiver includes a 128-byte deep FIFO, helping the card manage serial data more efficiently during multi-device communication. Programmable FIFO thresholds can be used for interrupts and automatic flow-control functions, while readable FIFO levels and flow-control status give developers greater visibility during system configuration and troubleshooting.

The W-954-4S supports automated in-band flow control with programmable XON/XOFF in both directions. It also supports out-of-band flow control through CTS#/RTS# and DSR#/DTR#. These options make the card adaptable to different device requirements and communication environments.

Multifunction PCI and Local-Bus Capability

The controller architecture includes a pass-through function for an 8-bit or 32-bit Local Bus operating asynchronously to the PCI clock. The Local Bus offers up to four chip-select signals and can be mapped to I/O or memory address space. Twelve multipurpose I/O pins are available and may also be configured as interrupt inputs.

These functions provide added flexibility for combination communication cards, embedded applications, specialized computer interfaces, and projects requiring UART, Local Bus, or parallel-port capability within one multifunction design.

Connector Configuration Options

The product information describes configurations that use a DB37 connection with breakout connectors. Depending on the selected arrangement, the card may be configured with four DB9 male serial connectors or with two DB9 male serial connectors and one parallel port in a 2S1P arrangement.

To reduce compatibility risks, buyers should confirm the required serial-port quantity, parallel-port requirement, connector gender, cable arrangement, pin assignment, and host-system environment before placing an order.

Typical Application Scenarios

Recommended application scenarios include:

• Industrial computer serial-port expansion

• Point-of-sale and retail terminal integration

• Laboratory instrument and testing-equipment connectivity

• Access-control and security-system communication

• Automation equipment and machine-interface projects

• Data-acquisition and monitoring installations

• Maintenance or retrofit projects for legacy RS232 devices

Why Choose PCI 4 Port Serial/RS232 Card W-954-4S?

W-954-4S combines four-channel serial expansion, broad UART software compatibility, deep FIFO buffering, flexible baud-rate control, automatic hardware and software flow control, and multifunction PCI capabilities. It is a practical option for system integrators, equipment manufacturers, maintenance companies, and technical distributors working with multiple RS232 peripherals.

For an accurate quotation, please provide the required quantity, operating system, PCI slot information, target application, preferred connector configuration, destination, packaging request, and expected order schedule. Availability, driver suitability, and final configuration should be confirmed before purchase.