Maintain access to critical serial equipment without replacing proven hardware. The SIIG DP CyberSerial 4S PCIe adds four RS-232 male DB9 ports through a PCIe 2.0 x1 interface, giving modern servers a direct path to legacy consoles, controllers, and industrial devices. Designed around the ASIX AX99100 chipset, this adapter supports baud rates up to 921 Kbps for responsive communication across serial workflows. RS-232 power support at 5 V or 12 V helps match connected device requirements, while the dual-profile bracket improves installation flexibility in compact and standard systems. For infrastructure teams, this card is about continuity. It preserves serial connectivity in environments where uptime, compatibility, and predictable behavior matter more than replacing equipment that still performs. TAA compliance also makes it suitable for procurement environments with sourcing requirements. When the job depends on stable serial access, this adapter delivers the right mix of port density, interface compatibility, and deployment flexibility for enterprise and industrial use.