Driver — 16c95x Serial Port

For half-duplex RS-485 networks, the 16C95x can automatically assert RTS (as a direction control signal) before transmitting and deassert it after the last stop bit.

Set the following in EFCR (Extended Features Control Register):

The driver then simply writes to THR; the hardware handles the turnaround delay.

Due to the high potential data rates (up to 15 Mbps), the CPU must service interrupts very quickly. If the operating system has high interrupt latency, the 128-byte RX FIFO may overflow before the ISR runs. The driver must often utilize a "Low Latency" mode or increase the service thread priority.

16C95x Serial Port Driver a specialized driver designed to support the Oxford Semiconductor OX16C95x

series of high-performance UART (Universal Asynchronous Receiver-Transmitter) controllers

. These chips are commonly found in industrial computers, PCI/PCIe expansion cards, and older business desktops (like those from ) that require reliable serial communication. Key Features and Capabilities Enhanced Performance : Supports data transfer rates up to in normal mode and up to in external clock modes. Deep FIFO Buffers : Features 128-byte deep

transmitter and receiver FIFOs (First-In-First-Out), which significantly reduce CPU overhead and prevent data loss during high-speed transfers. Automated Flow Control

: Provides automated hardware (RTS/CTS or DSR/DTR) and software (Xon/Xoff) flow control to prevent buffer overruns. Flexible Configuration Fully adjustable interrupt trigger levels. Support for 9-bit data frames , often used in multi-drop industrial protocols. RS-485 half-duplex configuration support. Backward Compatibility

: Software compatible with industry-standard 16C550 UARTs, ensuring it works with legacy serial peripherals. Implementation Details OS Compatibility

: Drivers are available for a wide range of operating systems, including Windows (XP through Windows 11) and Linux. Hardware Interface

: Typically used for serial ports (RS-232, RS-422, or RS-485) and sometimes parallel ports. Common Use Cases 16c95x serial port driver

: Essential for connecting modems, barcode scanners, industrial automation equipment, and POS (Point of Sale) devices. OX16C950 rev B High Performance UART with 128 byte FIFOs

The 16C95x serial port driver is a fundamental piece of software infrastructure that enables high-performance asynchronous communication between modern operating systems and high-speed UART (Universal Asynchronous Receiver/Transmitter) hardware. Specifically designed for the Oxford Semiconductor (now part of Diodes Incorporated) 16C950, 16C954, and 16C958 families, these drivers are the bridge that allows industrial and legacy hardware to interface with contemporary computing environments. Technical Foundation and Architecture

The 16C95x family is renowned in the embedded and industrial sectors for significantly exceeding the capabilities of the standard 16550 UART. While the classic 16550 utilizes a 16-byte FIFO (First-In, First-Out) buffer, the 16C95x series features a massive 128-byte FIFO.

The driver is responsible for managing this increased buffer depth to:

Prevent Data Overruns: By leveraging the larger buffer, the driver reduces the frequency of interrupts sent to the CPU, allowing the system to handle high-speed data streams (up to 15 Mbps in some configurations) without losing packets.

Automatic Flow Control: The driver configures the hardware's built-in automated RTS/CTS (Request to Send/Clear to Send) or XON/XOFF flow control, ensuring that communication pauses and resumes seamlessly based on buffer availability. Evolution of the Driver

Originally developed for Windows 95 and NT, the 16C95x driver has undergone several transformations to maintain compatibility with modern systems:

Legacy WDM Drivers: In the early 2000s, these drivers functioned as Windows Driver Model (WDM) components, often bundled with PCI or PCMCIA expansion cards.

Universal Windows Drivers (UWD): Modern iterations are often compliant with Windows 10 and 11, focusing on 64-bit architecture and Secure Boot compatibility.

Linux Integration: In the Linux ecosystem, support for the 16C95x is typically baked into the kernel's 8250 or serial core drivers. Because the 16C950 is backward compatible with the 16550, the kernel automatically detects the enhanced features (like the larger FIFO) and enables them via the standard serial interface (/dev/ttyS*). Implementation in Industrial Contexts

You will most commonly encounter the 16C95x driver when deploying: The driver then simply writes to THR; the

Multi-Port Serial Cards: Used in server rooms to manage multiple consoles or in retail for Point-of-Sale (POS) systems.

Automation Hardware: PLCs and CNC machines that require low-latency, high-reliability serial links.

Scientific Instruments: Data loggers that output high-density information over RS-232, RS-422, or RS-485 protocols. Installation and Troubleshooting

When installing a 16C95x driver, the process usually involves an .inf file that tells the operating system how to map the hardware’s I/O ports and IRQs (Interrupt Requests). Common troubleshooting steps for these drivers include:

FIFO Tuning: If data corruption occurs, users often use the driver's advanced settings to lower the "Receive Buffer" trigger level.

Baud Rate Aliasing: Because the 16C95x supports non-standard high speeds, drivers sometimes use "clock multipliers" to achieve specific baud rates that standard software doesn't recognize.

The 16C95x Serial Port driver is a specialized driver used to manage high-performance serial communication ports based on the Oxford Semiconductor (now part of Diodes Incorporated) 16C950 UART (Universal Asynchronous Receiver-Transmitter) architecture. Driver Overview

The 16C95x driver is commonly found in legacy and industrial-grade hardware, specifically for PCI and PCI Express (PCIe) expansion cards that add RS-232, RS-422, or RS-485 ports to a computer.

Chipset Heritage: Originally developed by Oxford Semiconductor, these chips (like the OX16C950 or OXPCIe952) are known for their high-speed capabilities, often reaching up to 921.6 Kbps.

Key Features: These drivers support deep FIFO (First-In, First-Out) buffers—typically 128 or 256 bytes—which significantly reduce CPU overhead compared to standard 16550 UARTs (which have only 16-byte buffers). Common Use Cases You will typically encounter this driver on:

Industrial Workstations: Dell Precision, HP ProDesk, and Fujitsu Esprimo systems often use these cards for legacy equipment connectivity. PCI/PCIe expansion cards

Multi-Port Serial Cards: Expansion cards that provide 2, 4, 8, or 16 additional serial ports.

Specialized Peripherals: Connecting CNC machines, barcode scanners, or older industrial printers. Compatibility & Installation Issues

The 16C95x is largely considered a legacy device, which can lead to modern driver conflicts. OS Support

Historically native to Windows XP and 7. Support for Windows 10/11 often requires manually browsing for drivers or using "Legacy Hardware" wizards. Hardware ID

Often appears in Device Manager under "Other Devices" with the Hardware ID OXPCIEMF\PNP0501 or OXPCI\VEN_1415. Installation Failures

Frequently fails to install automatically through Windows Update. Manual installation via Device Manager is usually required. How to Install/Update

Identify the Chip: Check Device Manager for a "PCI Serial Port" with a yellow exclamation mark.

Manual Update: Right-click the device -> Update Driver -> Browse my computer for drivers.

Vendor Sources: If you have an HP or Dell machine, search their Support Sites for "Oxford Serial Port" or "PCI Express Serial Card" drivers.

Workaround: If official drivers for Windows 11 are missing, Windows 7 or 8 drivers often work when installed in Compatibility Mode.

Are you trying to fix a "missing driver" error in your Device Manager right now? 16C95x Serial Port Driver for Pegatron - DriverIdentifier

If you are looking for the technical manual required to write or understand the driver for this chipset, the definitive resource is the datasheet from MaxLinear (formerly Exar).