Apparatus for automated dispensing of pharmaceutical doses in discrete solid form. A first device transmits to a second device a first optical signal at a first wavelength on a first optical fiber. The first and second bars are arranged here such that the incoming torque runs in a direction which is parallel to, but offset from, the direction of the outgoing torque. Alignment notches in sidewalls facilitate alignment of rooting channels between adjacent modules. Owing to this arrangement, the optical fiber to be held is pressed onto the stage at a further front-end side than the portion sandwiched by the stage and the lid section.