Internal Serial Interface Card Sunix SER5056AL — PCI, Low-profile, Serial outputs, Orange

Sunix SER5056AL is an internal low-profile PCI serial interface card that adds four independent RS-232 ports to PC systems. Housed in an orange low-profile bracket, the card supports both 3.3V and 5V PCI bus slots and is compatible with 32-bit and 64-bit PCI architectures. It integrates a SUN1999 UART controller compatible with the 16C950 specification, provides 128-byte FIFO buffering and on-chip hardware auto flow control to reduce data loss, and includes built-in ESD protection for reliable communication with legacy and industrial serial devices.

Advantages

The card expands system connectivity by providing four RS-232 serial outputs at communication speeds up to 115.2 kbps while maintaining compatibility with standard PCI slots and slim chassis thanks to its low-profile bracket. Onboard 128-byte FIFO and hardware flow control improve data integrity during high-throughput or burst transfers. Integrated ±2 kV ESD protection and compliance with CE, FCC and RoHS ensure robust operation in office and industrial environments. Plug-and-play support with BIOS-assigned I/O address and IRQ simplifies installation across multiple operating systems including Windows, Linux and DOS.

Suitable for

• Connecting legacy serial peripherals such as barcode scanners and modems
• Point-of-sale (POS) systems requiring multiple serial ports
• Industrial automation and control equipment integration
• Embedded or slim desktop systems needing low-profile expansion

Key specifications

• Interface: PCI host interface, supports 33 MHz bus
• Form factor: low-profile internal expansion card with low-profile bracket
• Serial ports: 4 independent RS-232 outputs
• UART: SUN1999 controller, 16C950 compatible
• Buffer: 128-byte onboard FIFO per card
• Data rate: up to 115.2 kbps per port
• Bus voltage support: 3.3V and 5V PCI slots; compatible with 32-bit and 64-bit PCI
• Protection: built-in ±2 kV ESD protection on serial signals
• Compatibility: supports Windows, Linux and DOS drivers

How to use

Install the SER5056AL into a free PCI slot on the system motherboard using the low-profile bracket if the chassis is slim. Ensure the host system provides a compatible 3.3V or 5V PCI slot and that the card is firmly seated. After powering on, allow the BIOS to assign I/O addresses and IRQs automatically. Install or verify the appropriate drivers for your operating system (Windows, Linux or DOS) so that applications can access the added COM ports. Connect RS-232 devices to the card’s serial outputs using standard serial cables and configure communication parameters (baud rate, parity, data bits, stop bits and flow control) in the host software.

Recommendations

Use shielded serial cables for longer runs or electrically noisy environments and enable hardware flow control when transferring large or continuous data streams to minimize data loss. Verify chassis compatibility with low-profile brackets before installation, and ensure you use updated drivers from your system vendor for best stability in modern operating systems.