Name: Johnson Controls Metasys N2
Brand: Johnson Controls
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Network Communications—N2 Communications Bus

Base Frame

TBC801

tbcfuse

Leads from Continuity Tester or Ohmmeter

Figure 32: Checking Fuses on the

Communication Terminal Board

You can use an oscilloscope to pinpoint communication faults over the

N2 Bus. The procedure requires a 2-channel scope with an A minus B

function or an A plus B with B inverted function. Follow these steps:

Plug the scope into a grounded electrical outlet.

Set both channels to 2 volts per division. Both channels must have the

same gain or volts per division setting.

With no signal applied, adjust each channel’s vertical position at the

same graticule on the screen (i.e., center screen).

Select the Channel A minus B function. If your scope does not have

this function, select the Add function (Channel A Added to B then

Invert Channel B),

Select the 0.5 mS horizontal range.

Checking

Communication

Faults

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Johnson Controls Metasys N2 Specifications

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