Bircher 6120.521.545 RS232 Interface PLC Board

PRETEC 6120.521.545 and 990E.CIF.545 denote a four-port RS-232C interface board designed for PLC environments, providing four RS-232 serial channels that connect a host controller to multiple serial peripherals through a single module. Manufactured in Germany, the PRETEC interface is listed in distributor catalogs under the 6120.521.545 and 990E.CIF.545 designations, confirming its role as a PLC interface board rather than a separate communications card. The unit carries a compact, board‑level form factor suitable for installation in standard automation enclosures, with a reported item weight of 0.50 kg and a shipping weight of 1.50 kg for packaging and transit. In routine PLC configurations, this four-port RS-232C board enables serial data exchange with external devices—such as sensors, printers, or programming interfaces—without requiring additional adapters, helping to streamline wiring and reduce panel complexity.