Abstract: An interface device having a printed circuit board connected to a processor unit and an electronic base with grooves to receive the board with active or passive interface devices connected by terminal blocks. The interface devices are housed in separate modules having lengths which are equal to or integer multiples of a modulus wherein each module includes a strip of indicator openings or terminal operating openings disposed lengthwise at a particular pitch. The modules have complementary grooves and tongues on their side faces in order to permit assembly perpendicular to the plane of the board thereby forming a rigid assembly.

Abstract: An interface device that includes a base having a body between top and bottom longitudinal flanges, a circuit board, and an interface unit including a first terminal block with a row of aligned terminals at a front of the block where the aligned terminals are electrically connected to a circuit board mounted on the base. The interface device includes an additional terminal block attached to a bottom of the base by a retainer. The retainer is constructed in the form of M-shaped members attached to a face of the additional terminal block, that clip into a longitudinal groove on the bottom of the base. The additional terminal block may be mounted such that terminals on the additional terminal block are parallel to terminals on the first terminal block and set back therefrom. The body of the base also includes a longitudinal slideway in which longitudinal edges of the printed circuit board are accommodated.