Black Box TL421-C 4PT RS232 Passive Splitter

Reduce serial hardware sprawl by letting four terminals share a single RS232 DCE device through a passive splitter designed for simple, dependable distribution. The Black Box TL421-C keeps deployment overhead low: no user-configurable switches, jumpers, or software settings are required. Connect the modem and terminal-side RS232 links, and the splitter handles the rest. This model is well suited for environments where serial connectivity still matters and uptime depends on keeping infrastructure lean. Used with the RS-232 Modem Splitter Rackmount Chassis - 2U (TL400A), it supports a clean rack-based installation that helps consolidate modem access and reduce the cost of multiple modems and lines. For teams maintaining legacy serial workflows, the value is in its simplicity: fewer active components, fewer points of failure, and faster setup. When you need to extend the life of existing RS232 equipment without overbuilding the solution, this passive splitter delivers a practical path forward. It is a focused accessory for shared serial access, not a general-purpose converter, which makes its role clear in controlled AV and communications environments.