Based on this product's specifications, here are some alternatives and similar models
2-Port Serial PCIe Card StarTech 2S232422485-PC-CARD RS232 RS422 RS485
Summary description:
The StarTech 2-Port Serial PCIe Card supports RS232, RS422, and RS485 communication with a PCIe interface and a baud rate of 921.6 Kbit/s. It is compatible with Windows and Linux operating systems, includes low-profile brackets for versatile installation, and features Level-4 ESD protection, making it ideal for industrial applications that require reliable serial communication.