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B3 USI4

For connecting SecuriFire sub control units to control systems, for controlling external printers, pagers, ComBOX units, telephone servers etc. A total of 4 redundant, serial, asynchronous interfaces can be used as redundant RS 485 connections in half-duplex mode (for loops) or as non-redundant RS 422 connections in full-duplex mode (for lines). Furthermore, two of the four interfaces can also be operated as RS 232 in full-duplex operation (line) each with 2 control circuits. The selection of each interface’s operating mode is done by programming and hardware configuration. A maximum of five B3-USI4 units can be fitted per sub control unit.