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14 Introducing HSL
1.4 Technical Information
1.4.1 HSL Technology Introduction
Inside an HSL system, a single master controller communicates
with multi-slave through a command-response. The master con-
troller sends commands to slave I/O modules for setting output
values and requesting input information. Every slave module
responds after receiving commands with address ID. The
responses may either be to set output according to the received
values or to reply requested input information to the master con-
troller.
The illustration below shows the HSL working theory as regards
the setting of output values.
Figure 1-6: HSL technology brief -1
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