: Most 16C95x devices use Oxford Semiconductor (now part of PLX Technology/Broadcom) chips. Look for Hardware IDs like PCI\VEN_1415 or OXPCIMF\PNP0501 in the device properties. Download Sources :
: Beyond standard 5, 6, 7, and 8-bit framing, it supports 9-bit data for specific industrial protocols. Hardware & OS Compatibility
The 16C95X UART (Universal Asynchronous Receiver-Transmitter) represents the pinnacle of high-performance legacy serial communication. Found in industrial automation, point-of-sale systems, and specialized network equipment, this hardware requires dedicated driver support to function optimally in modern computing environments. 16c95x serial port driver
Understanding the 16C95X Serial Port Driver: A Comprehensive Technical Guide
| Offset | DLAB=0 | DLAB=1 | |--------|--------|--------| | 0x00 | THR (Tx) / RHR (Rx) | DLL (Divisor LSB) | | 0x01 | IER (Interrupt Enable) | DLM (Divisor MSB) | | 0x02 | IIR (Interrupt ID) / FCR (FIFO Control) | - | | 0x03 | LCR (Line Control) | LCR | | 0x04 | MCR (Modem Control) | MCR | | 0x05 | LSR (Line Status) | LSR | | 0x06 | MSR (Modem Status) | MSR | | 0x07 | SCR (Scratch) | SCR | : Most 16C95x devices use Oxford Semiconductor (now
The 16C95x can be configured for RS485 half-duplex operation. In this mode, the driver can automatically control the DTR (Data Terminal Ready) pin to enable the transmitter only when data is being sent. This simplifies the creation of robust multi-drop serial networks.
: Features automated in-band (Xon/Xoff) and out-of-band (CTS/RTS and DSR/DTR) hardware flow control. Backward Compatibility Hardware & OS Compatibility The 16C95X UART (Universal
Major Windows feature updates frequently overwrite custom vendor drivers with generic Microsoft class drivers, which breaks the extended 16C95X functionalities.
The 16C95x family (often referred to as 16C950 / 16C954 / related PCI UART-style devices) are multi-channel serial controller chips commonly found on industrial I/O cards and embedded platforms. This post explains the device features, driver architecture, key implementation details, common pitfalls, and a small reference implementation outline suitable for a Linux-like environment. The goal is practical: give an engineer what they need to write, port, or debug a driver for a 16C95x-based serial card.
| Symptom | Likely Cause | Fix | |---------|--------------|-----| | Tx stops after first byte | THRE interrupt not re-enabled | Check start_tx() enables IER_THRI | | Rx overrun errors | Rx FIFO threshold too high | Lower TLR value or increase CPU responsiveness | | Spurious CTS/RTS changes | Auto flow control misconfigured | Verify EFR bits and MCR_AFE | | Baud rate off by factor 2 | Forgot DLAB=1 when setting divisor | Re-check initialization order |