WattMaster WHP | Section 4 |
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5.3.2Checking the Comm Loop at the CommLink II
Diagram
The indicated values are typical of a normal system, actual readings may deviate slightly due to the number of units connected and other system specific factors.
All of the connected Minilinks should be powered up for this test.
Note:The Loop LED (located on the front panel) should “flicker” when the CommLink II is attempting to communicate with the MiniLinks. There is a noticeable change in the flicker when the loop is disconnected, if you observe a normal functioning unit. When the loop is reconnected it may take up to 60 seconds before the CommLink II re- establishes communications with the MiniLinks.
Overview
This is a “quick check” to determine if any of the driver chips on the Network loop are damaged. Since all units will “float” both of their communications connections at about 2.45 Volts, you can quickly check the Network loop by unplugging it at the CommLink II.
Be sure that the loop you are testing does not have a short circuit from T to R.
Measurements |
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Note: |
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Network– G (SHLD)Loop | AcceptableRange | |
Tip: |
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R – G (SHLD) |
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Action
If voltages areConditiontoo high or too low on either side
One or more of theActionMiniLinks has a damaged Network driver chip. Disconnect the Mini- Links one at time to isolate the problem.
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