ADLINK HSL-DI16DO16-M-NN - Manual (Page 28)

Introducing HSL 15
The teacher (master) sends message “ID.#, your output values
are XXX” to all students (slave I/O modules). Every student (with
ID.#) then sets its output channels according to the values heard.
The values that the teacher announced to the students are written
on the blackboard (RAM on master cards), and can be easily mod-
ified.
The following illustration shows the working theory for gathering
input information.
Figure 1-7: HSL technology brief-2