Advantech BB-232MSS2 is a RS-232 4-Port Mini Smart Switch / Port Combiner that lets a single RS-232 host connect to up to four slave devices via one DB25 master port and four DB9 slave ports. The master DB25 port can be configured as DTE or DCE through an internal switch, and four LEDs indicate which slave is connected to the master, providing quick visual status. It supports baud rates from 1200 to 115.2 kbps and features automatic transmit and receive data control for straightforward inline operation. The unit requires a 12–16 VDC external power supply (12 VDC to 16 VDC @ 10 mA) via a 2.5 mm power jack with the tip positive; the power supply is sold separately. Physical dimensions are 12.2 x 7.1 x 2.3 cm (4.8 x 2.8 x 0.9 in) and its weight is listed as 4.23 oz. Described by Advantech as a Four-Port Mini Smart Switch / Port Combiner, the BB-232MSS2 complies with EN 55022 and EN 61000-6-1, reflecting its light-industrial ITE equipment classification. This device is designed to consolidate multiple RS-232 peripherals behind a single host interface, simplifying cabling and device selection when connecting serial instruments, modems, or other RS-232 devices.
