16 N2 Dialer Module—N2 Dialer Module (NDM)
NDMs are configured and downloaded using HVAC PRO for Windows Release 5.10 or
later. The N2 Dial Application included in the HVAC PRO for Windows User’s Manual
details these procedures. Please review this bulletin for more information.
The NDM can be configured as a remote or local device and its function varies based on
its configuration. When configured as a local, the NDM is connected to the N2 Bus
which directly interfaces to the facility management system. It accepts commands from
the facility management system and initiates a dial out to the remote facility through a
modem for point monitoring and command. It becomes a transparent link to the remote
facility when called on. The local NDM and modem also accept calls from the remote
NDM and modem when an alarm triggers the remote NDM initiating a dial-in sequence.
When not communicating to another modem, the remote NDM scans the remote N2 Bus
for reportable Change-of-State (COS) conditions. When one is detected, it initiates a
dial-in sequence to the local NDM and its modem and reports the alarm to the facility
management system.
Four main software points in a local NDM provide control and indicate a connection to
the remote NDMs:
•
dial command
•
connection status
•
disconnect delay
•
disconnect delay control
Operation
Local Operation
Summary of Contents for N2
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