The S2USB485-JC-CB is a USB to full-duplex RS-232 and half-duplex RS-485 serial converter integrated into a single device. In essence the S2USB485-JC-CB is a single USB serial port that has two electrical interfaces available to it (RS-232 and RS-485).

The S2UI28 is a wall-mount Customizable User Interface Terminal (2.8" TFT LCD with Touch Screen) that provides interaction between the User and the User’s Building Management System (BMS).

The S2USB485 JCB (without cable) is a USB to full-duplex RS-232 and half-duplex RS-485 serial converter integrated into a single device. In essence the S2USB485-JC-B is a single USB serial port that has two electrical interfaces available to it.