TeSys U communication module for Modbus, to be inserted in advanced power bases LUB120, LUB320, LUB380 equipped with a BL type (24V DC) LUC control unit. It provides a RJ45 connector for connection to a Modbus network, a plug-in terminal block for the connection to an external power supply 24V DC, in addition with 2 x configurable logic inputs 24V DC and 1 x logic output 24V DC. 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 3 LEDs indicating 24V voltage presence (24V=) and communication status (COMM, ERR). Certified when used in conjunction with a LUB power base (IEC, UL, CSA, CCC, EAC, Marine).