Use this adapter from StarTech.com to increase the number of RS232 (recommended standard) serial ports on your computer. It plugs into your PCIe (peripheral component interconnect express) slot and provides an additional four DB9 (D-subminiature) ports via a breakout cable, so you can interact with serial devices. You'll find this adapter used in office environments, as well as in commercial applications such as POS (point of sale) devices.

High-speed data transferThis adapter delivers a high band rate of up to 921.6Kbps (kilobits per second) for efficient serial communication.
Ample cable lengthComes with serial cables that are 300mm long, so you can conveniently connect multiple devices simultaneously.

• Broad operating temperature range of -10°C to +80°C for use in demanding conditions• Low weight of 264g, so it's easy to handle and won't put a strain on your computer setup• Steel material is durable and corrosion-resistant for reliable long-term performance

The Startech 4-port PCI Express RS232 serial adapter card lets you add four RS232 (DB9) serial ports to your computer through a PCI Express (PCIe) slot. The 4 port PCIe serial card enables you to interact with serial devices.

Serial controller card with 16950 UART based on ASIX AX99100, allows 4x DB9 ports w/bi-directional RS232 speeds up to 921.6Kbps per port
PCIe multiport serial card provides 12v, 5v, or none through pin 9 w/up to 2A total
PCI Express RS232 serial adapter c

What's the MTBF of this adapter?This adapter has an MTBF (mean time between failures) of 214,358 hours, so you can rely on it for long-term performance.

Asix

AX99100