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$95 HD/LINKer - Invensys Rail

$95 HD/LINKer - Invensys Rail

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VIRTUAL CIRCUIT EXAMPLES<br />

Document No.: SIG-00-97-08 Version: C<br />

Figure 12-3. Unidirectional, Unipolar Aspect<br />

Circuit Virtual Circuit Configuration<br />

12.1.2 Two-Wire, Unidirectional, Bipolar Aspect Circuit<br />

The two-wire, unidirectional, bipolar aspect circuit, figure 12-4, also provides one-way traffic sensing.<br />

The pole-line connections of this circuit may be converted to virtual-line circuits by the addition of<br />

<strong>HD</strong>/LINK modules as shown in figure 12-5. The corresponding Main Window virtual-circuit<br />

configuration display is shown in figure 12-6.<br />

12-4

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