Connecting The N2 Bus - Johnson Controls VMA1400 Series Manual

24
Mounting and Wiring VMA1400 Series Controllers Technical Bulletin

Connecting the N2 Bus

Note: A hardware connection between the VMA and the Network
Control Module (NCM) or N30 is required if the VMA is to
communicate with the Metasys Operator Workstation
(OWS).
To connect the N2 Bus:
1. Set the N2 address of the VMA per engineering drawings before
wiring the VMA (if not already done).
2. Connect the N2 Bus wires to the VMA, and continue in a daisy
chain to the next VMA. Repeat this process for each VMA.
To
N2 REF
Next
N2-
N2
N2+
Device
Figure 12: Connecting the VMA to an NCM
3. Apply power. Locate and observe the VMA LED. Refer to
Table 12 to interpret the LED indications.
NCM300 Series
Port 1 - N2 Bus
or
NCM200 Series
(TB1 or Communicator
Terminal Board)
HRD 6
GRD
7
SFT
GRD
8
REF
N2+
N2-
N2 REF
3
SFT
GRD
2
N2+
1
N2-
NCMCONN4