Wiring a Signaling Line Circuit (SLC)
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AFP-300/AFP-400 Installation PN 50253:C1 05/22/97 2-45
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The total DC resistance of the SLC pair cannot exceed 40 ohms. Measure DC
resistance as shown in Figure 2-62.
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1. Disconnect the SLC Out and SLC Return at the control panel.
2. Short the two leads of SLC Return.
3. Measure the resistance across the SLC Out leads (Figure 2-62).
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The total length of wire (12 AWG) in a four-wire SLC cannot exceed 10,000 feet.
Figure 2-63 identifies the output and return loops from SLC terminal TB5 on the CPU:
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