Johnson Controls Metasys N2 User Manual

Network Communications—N2 Communications Bus
25
6
5
3
2
1
4
Twisted
Twisted
6
5
3
2
14
Twisted
Twisted
OUT (+)
REF-IN
OUT (-)
REF-OUT
HRD
GND
SFT
GND
SFT
GND
SFT
GND
HRD
GND
SFT
GND
Two Twisted Pair Telephone Cable
3-wire Twisted Cable
Notes:
We recommend stranded 22 AWG or heavier wire.
Experience has shown that solid 24/26 AWG wire
is prone to breakage during installation.
If shielded wire is used, wire shield to SFT GRD
(soft ground) terminal. To hard ground N2 Bus,
wire shield to HRD GRD (hard ground). N2 Bus
should be hard grounded at only one location,
preferably at the NCU.
Wires that are labeled "OUT" and "REF OUT"
are only used if the N2 Bus must continue
to another device.
For two twisted pair cable, terminate one pair
to (+) and (-). Terminate the other pair by
terminating one wire to REF and folding back and
taping the remaining wire.
N1 LAN Coax
Connectors
TB2 TB1
tbcwire
IN (-)
IN (+)
REF-IN
REF-OUT
REF-OUT
IN (-)
IN (+)
OUT (+)
REF-IN
Note:
Coax connectors
are not on BSF121.
Figure 10: Wiring N2 Bus to the Communication Terminal Board (TBC801)

Johnson Controls Metasys N2 Specifications

General

Brand	Johnson Controls
Model	Metasys N2
Category	Cables and connectors
Language	English