16c95x Serial Port Driver Jun 2026

: Beyond standard 5, 6, 7, and 8-bit framing, it supports 9-bit data for specific industrial protocols. Hardware & OS Compatibility

Instead of one interrupt per byte, the Rx FIFO triggers an interrupt when a programmable threshold is reached (e.g., 112 bytes). The driver can then read up to 128 bytes in one ISR loop. 16c95x serial port driver

The 16C95x driver enables baud rates up to 460 Kbaud or higher, but the actual maximum depends on the hardware implementation. Some cards, like the EX-42032IS, can reach up to 921.6 Kbaud/s. For optimal performance, ensure that the driver is using the correct clock source and that the FIFO trigger levels are appropriately set. On Windows, you can use the driver's property pages to adjust these settings. On Linux, the setserial command can be used to view and modify UART parameters, such as the FIFO trigger level. : Beyond standard 5, 6, 7, and 8-bit

The driver must manage bank switching carefully, restoring LCR after accessing extended registers. The 16C95x driver enables baud rates up to

For Windows, Oxford Semiconductor and other manufacturers provide reference drivers for the OX16C95x UART family. These drivers are structured as Plug and Play bus drivers that create device objects for each UART or parallel port. A single-port driver then hooks each UART, enabling the advanced 16C95x features. The drivers are available for Windows NT4, 2000, XP, and later versions.

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

In Windows Device Manager, you can enter the Advanced settings of the COM port to adjust the Receiver and Transmitter FIFO buffers. If you experience data dropouts, lowering the trigger level can give the host CPU more time to respond.