Keep legacy serial systems connected with a compact DB9-to-RJ45 modular adapter designed for practical infrastructure work. The Eaton Tripp Lite Series P440-89FM converts a DB9 serial interface to RJ45, supporting RS-232 and RS-422 applications where existing equipment, console access, or field devices must remain in service. It is a straightforward way to align older serial hardware with structured cabling practices already in place. This adapter is especially useful when space, cable management, and serviceability matter. By moving the connection to RJ45, you can simplify routing and reduce clutter at the point of use while preserving the serial interface required by the device. That makes it a strong fit for network closets, industrial control cabinets, and support environments where serial access is still part of daily operations. As a passive adapter, it keeps the deployment simple: no external power, no added complexity, and no unnecessary conversion hardware. For teams maintaining mixed-generation infrastructure, that combination is valuable. It helps extend the life of serial assets, supports dependable field service, and avoids the cost of replacing equipment that still performs its job.