Download Alfa Network N2 Specifications

Troubleshooting Procedures
*51
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Overview
•
Checking for Good Wire Runs
51
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Checking for Proper Termination
52
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Checking the End-of-Line Device Settings
52
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Checking for Proper Channel Selection
52
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Checking the N2 Device
52
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Checking the Number of Defined N2 Devices
52
•
Checking the Length of N2 Bus
•
Checking for “T” or “Y” Connections
53
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Checking for a Ground Loop
53
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Checking the Repeater
53
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Checking the Surge Protector
53
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Checking the Communication Terminal Board
54
•
Checking Communication Faults
*51
*53
*55
Ordering Instructions
57
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Johnson Controls Code Numbers
57
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Vendor Code Numbers
*57
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Repair Parts
*58
* Indicates those sections where changes have occurred since the last printing.
2
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Network Communications—N2 Communications Bus