'This 8-Port Industrial RS-232 DB9 Adapter connects to your laptop or desktop through a single USB port, adding eight fully addressable serial COM ports. Each port is easy to configure in your system’s device manager, making setup simple. Built into a rugged metal chassis, this adapter is made for demanding environments like labs, warehouses, automation systems, and heavy machinery. It operates in a self-powered mode by default, with the option for variable voltage input from 9V-48V DC when pass-through power is needed. LED indicators for power, RX, and TX keep you informed at a glance, and the included surface and DIN rail mounting brackets allow you to install it right where it''s needed.'