N2 Dialer Module—N2 Dialer Module (NDM) 61
Note:
See the Point Mapping Table at the end of this appendix for an overview of all
mappable points in the local and remote NDMs.
It is not necessary to map any of the remote NDM data points into the Metasys data base.
A few communication parameters may be mapped to allow for easy update without
having to enter the commissioning mode of HVAC PRO for Windows, but it is only
required that the remote NDM itself be mapped into the system as a hardware object.
One point in the remote NDM that may come in handy is the dial in enable point (BD-72).
This controls whether or not the remote dialer is able to initiate a dial in on an alarm
condition. If you are aware of several system problems at a remote facility and continue
to receive reportable alarms, you can use this point to disable the reporting function until
the condition is corrected.
The remote NDM polls the remote N2 Bus devices for reportable COS conditions. If one
is noted, the remote NDM initiates the dial in sequence to the NCM, through the local
NDM, to pass the alarm information on to the supervisory system. A COS report is
generated both when the point enters alarm and when it returns to normal.
When mapping points into Metasys, there are two items that enable a point in a remote
device to generate a reportable alarm.
First, the points must be direct mapped to standard Metasys objects (not the CS object).
This triggers the NCM to enable the COS reporting for that point in the controller.
Second, the normal condition for that binary point must not be defined as None. If the
normal condition is defined as None, then the COS condition will not trigger the remote
NDM to dial in to report the change. However, if the normal condition is set to
something other than None, then the NDM will dial in and report the COS to the
supervisory system as defined in the NDM’s configuration file.
As stated above, the remote NDM polls the remote N2 Bus devices for reportable COS
conditions. A COS report is generated both when the point enters alarm and when it
returns to normal.
As with the binary points, there are two items that enable an analog point in a remote
device to generate a reportable alarm.
First, the analog inputs must be direct mapped to standard Metasys objects (not the CS
object). This triggers the NCM to enable the COS reporting for that point in the
controller.
Remote NDM--
Software Point
Mapping
Reporting
Binary Changes
of State (COS)
Reporting
Analog Alarm
Conditions
Summary of Contents for N2
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