Digitus 2-Port Serial PCI Card

Overview of the Digitus 2‑Port Serial PCI Card (DS‑33003)

The Digitus DS‑33003 is a compact, low‑profile expansion solution that delivers two dedicated RS‑232 serial ports directly to a desktop or workstation via the standard PCI bus. Designed for industrial automation, instrumentation, and legacy device connectivity, this card provides reliable, high‑speed communication in a small footprint.

Key Physical Characteristics

• Color: Black (Negrón / Noir)
• Form Factor: Low‑profile PCI module with integrated mounting plate for easy installation.
• External Connectors: Two DB9 (DE-9) serial connectors, fully shielded and ready for immediate use.
• No internal DB9 headers; all connections are external, simplifying cable management.
• Dimensions: Standard PCI size; fits any full‑size or low‑profile motherboard slot.

Electrical and Performance Specifications

• Host Interface: PCI (32‑bit, 33 MHz) – ensures compatibility with a wide range of motherboards.
• Serial Interface: RS‑232 compliant on both ports.
• Maximum Baud Rate: 115 kB/s per port, sufficient for most industrial protocols (Modbus RTU, ASCII, binary).
• FIFO Buffer: 256 bytes per channel – reduces data loss during burst transmissions.
• Signal Levels: Standard RS‑232 voltage ranges (+/- 3 V to +/−12 V) with automatic level detection.

Software and Driver Support

The card is fully Plug & Play (PnP), meaning that on supported operating systems the driver will load automatically without manual intervention. The included user manual provides detailed instructions for:

• Installing the PCI card in a compatible system.
• Configuring COM port assignments via the BIOS or Windows Device Manager.
• Tuning serial parameters (baud rate, parity, stop bits, flow control).
• Using the provided API for advanced applications such as DMA transfers and interrupt handling.

Operating System Compatibility

The DS‑33003 is supported on a broad range of Windows operating systems, from legacy versions (Windows 95/98) to modern releases (Windows 10/11). The driver package includes 32‑bit and 64‑bit binaries, ensuring seamless integration in mixed environments.

Typical Use Cases

• Industrial Automation: Connecting PLCs, SCADA systems, or motor controllers that communicate over RS‑232.
• Laboratory Equipment: Linking oscilloscopes, multimeters, and data acquisition devices to a PC for real‑time monitoring.
• Legacy System Integration: Providing serial access to older equipment that lacks modern interfaces.
• Embedded Development: Serving as a test harness for embedded firmware that outputs serial debug information.

Installation and Configuration Steps

1. Power down the computer and open the case. Locate an available PCI slot.
2. Insert the DS‑33003 into the slot, aligning the mounting plate with the chassis screw holes.
3. Screw the card in place and close the case.
4. Connect the two DB9 cables to the desired serial devices.
5. Power on the system. The operating system will detect the new COM ports automatically.
6. Use Device Manager or the provided configuration utility to assign port numbers if necessary.

Maintenance and Troubleshooting Tips

• Ensure that the PCI slot is fully seated; a loose connection can cause intermittent failures.
• Verify that the COM ports are not already assigned by another device to avoid conflicts.
• Use the included diagnostic tools to test FIFO integrity and signal levels.
• If communication errors occur, check cable shielding and grounding; RS‑232 is sensitive to noise.

Why Choose Digitus DS‑33003?

The combination of a compact low‑profile design, robust 256‑byte FIFO buffers, and straightforward Plug & Play installation makes the Digitus 2‑Port Serial PCI Card an ideal choice for professionals who need reliable serial connectivity without the bulk of external adapters. Its proven compatibility with a wide range of Windows platforms and industrial protocols ensures that it will remain functional in both current and legacy environments.

Conclusion

The Digitus DS‑33003 2‑Port Serial PCI Card delivers dependable, high‑speed RS‑232 communication directly from the motherboard. With its low‑profile form factor, generous FIFO buffering, and comprehensive driver support, it stands out as a versatile solution for any application that requires reliable serial interfacing in a compact package.