Maintain access to critical serial devices without redesigning the stack. Digi EdgePort/4S adds four DB-9 serial ports through USB and lets each port be configured in software for RS-232, RS-422, or RS-485 operation. That flexibility makes it a strong fit for environments where one adapter must support multiple device types, from legacy controllers and instrumentation to console and service connections. For infrastructure teams, the value is control. Instead of carrying separate adapters for different serial standards, this model consolidates port expansion into a single device with predictable deployment behavior. The DB-9 interface keeps compatibility broad, while software-selectable signaling helps match the port to the endpoint without hardware swaps. Use it where serial connectivity still carries operational weight: plant-floor systems, lab equipment, network appliances, and embedded devices that cannot be replaced on a short cycle. Digi’s EdgePort line is built for that reality — extending the life of proven equipment while keeping integration straightforward for support teams and procurement alike.