PCIe-S142/144i communication card provides 2/4 RS-422/485 serial ports. Each port is equipped with a 256-byte hardware FIFO, and offers speed up to 921600 bps. The PCIe-S142/144i card supports drivers to assign  an available COM port number automatically.
 
In harsh industrial environments, the on-board ESD protection component (for i version PCIe-S144i) diverts the potentially damaging charge away from sensitive circuit to protects the computer and equipment from the sudden and momentary electric current.
 
The serial communication card are designed for use with intelligent devices like bar code reader, serial printers, intelligent sensors, instrumentation equipment, computers and almost any device with an RS-422/485 port.

FIFO stands for "First In, First Out", an abstraction in ways of organizing and manipulating data relative to time and prioritization. FIFO is used for buffering and flow control while data come from hardware to software. When using hardware FIFO (buffer), a little delay on software or operating system will not lost data at all.

PCIe-S142/144i card are equipped with 256-byte hardware FIFO for each port. Large hardware FIFO is useful to prevent data lost when your system works under heavy load, e.g. while running on a multi-task operating system such as Windows, Linux… etc.

For more information, please visit the following website：
https://www.icpdas.com/en/product/PCIe-S142
https://www.icpdas.com/en/product/PCIe-S144i