For low-voltage digital signals, double-shielded cable is the best choice, but can also be a single-
shielded or unshielded twisted pair, as shown in Figure 2, however, the frequency of the signal, it can
only use a shielded cable.
Relay cable need to use cables with metal braid shield.
Need to use a network cable to connect the keyboard, for electromagnetic environment is more
complex place, it is recommended to use shielded cable.
Note: analog and digital signals using different cables routed separately.
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