14 Control Modules—Network Control Module 200 Series
Migration Functionality: Gateway
An NCM200 with a 200 series NIM and Gateway software can connect
one gateway trunk (via the RS-232 submodule) and map up to 1400 JC/85
Level 3 points. This trunk requires a dedicated RS-232 port on the JC/85
headend. An NIM206 handles the largest JC/85 data base allowed.
Migration Functionality: Network Port Application
See the Network Port Technical Bulletin (LIT-6295050).
Migration Functionality: S2 Migration
An NCM200 with a 200 series NIM and S2 software can connect
one JC/85 trunk through one Table Top Modem (for example, if
four trunks were originally connected to the JC/85 headend, four NCMs
are required unless the trunks can be reconfigured). The data base size of
each trunk can be calculated with the NCM Memory Estimator.
The following are countable JC/85 objects:
•
FPU device
•
FPU hardware points (the SST101 counts as two objects)
•
DSC-8500 device
•
DSC-8500 hardware points
•
DSC-8500 data points
•
DSC-8500 status variables
In addition to the memory required by the object count and Metasys
standard features, also calculate additional memory used for written
programs of GPL equivalents to JC/85 features. See How to Use the
Metasys GPL HVAC Library (LIT-636121), under the App. Notes: GPL
HVAC Library tab of the Metasys Network Technical Manual (FAN 636).
Applications of interest to JC/85 users are:
•
interlocks
•
computed points
•
chiller sequencing
Application notes exist for each of these processes in Volume IV of the
Metasys Network Technical Manual (FAN 636).
Among the considerations about adapting JC/85 code to Metasys, here are
a few that may adjust the memory requirements:
•
Auto Shutdown
When converting JC/85’s Auto Shutdown feature to Metasys, write an
equivalent GPL process for Metasys and add the file object size to the
NCM’s memory usage.
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