TeSys U communication module for AS-Interface bus, to be inserted in advanced power bases LUB120, LUB320, LUB380 equipped with a BL type (24V DC) LUC control unit. It provides a yellow 2-point plug-in connector for connection to an AS-I network (limited to 31 slaves), a black 2-point plug-in connector for connection to an external 24V DC supply. On front side, a 3-point plug-in terminal block is provided for the local control of the starter controller, to be associated with a control terminal block LU9BN11C for a LUB base or LU9MRC for a LU2B base. It displays 2 LEDs indicating 24V voltage presence (PWR) and communication status (FAULT). Certified when used in conjunction with a LUB power base (IEC, UL, CSA, CCC, EAC, Marine).