Keep legacy serial connections organized without changing the equipment behind them. The Advantech BB-9PMDS is a 9-pin modem data splitter designed to support serial routing in environments where dependable access and clean cable management matter. For teams maintaining older communications gear, test systems, or embedded devices, a splitter can make day-to-day work faster and less error-prone. It helps separate or distribute a 9-pin modem/data connection so technicians can work with existing infrastructure more efficiently. This is the kind of accessory that earns its place in a service kit: simple, purpose-built, and useful where serial ports still anchor critical workflows. Instead of forcing a redesign, it preserves the installed base and supports the operational reality of mixed-generation systems.