PCIe to 4-Port RS232 Serial Adapter Card with AX99100 Chip, Industrial-Grade COM Port Expansion PCI-E Card for PLC, Scanner, POS and Industrial Control Equipment

This PCIe 4-port RS232 serial expansion card adopts mature AX99100 dedicated serial communication chip, providing reliable multi-channel COM port expansion for industrial control hosts, POS cash registers, monitoring workstations and maintenance computers with insufficient native serial ports.

It comes with four independent RS232 DB9 ports that can operate at the same time without signal interference, supporting common serial peripherals such as PLC controllers, barcode scanners, industrial sensors, serial printers, access control terminals and debugging modules. The AX99100 chip delivers high compatibility with mainstream serial communication protocols and maintains smooth data transmission at various baud rates.

Designed with standard PCIe x1 form factor, the card is universally compatible with all PCIe slots on Intel and AMD motherboards, whether old or new desktop platforms. Built-in multi-layer electromagnetic shielding and surge protection components effectively resist voltage fluctuation and signal noise generated by motors and power equipment, realizing 24-hour uninterrupted industrial operation.

Complete matching drivers are provided for Windows 7/10/11 and all mainstream Linux distributions. After simple driver installation, users can directly identify 4 independent COM ports without complicated configuration. Equipped with a sturdy metal full-height baffle for firm chassis fixing.

It is widely used in factory automation production lines, retail POS systems, machine tool debugging, security monitoring equipment and laboratory serial device testing, an essential expansion accessory for industrial PC renovation.