Communication bus and supply power table
Table 6: Communication bus and supply power terminal blocks, functions, ratings,
requirements, and cables
Terminal block/
Port label
Terminal labels
Function, electrical
ratings/Requirements
Recommended cable type
1
+
-
N2/FC Bus
Communications
COM
Signal Reference (Common)
for bus communications
N2/FC BUS
2
SHLD
Isolated terminal (optional
shield drain connection)
Use existing cable or 18
AWG
+
-
SA Bus Communications
COM
SA Bus Signal Reference
and 15 VDC Common
SA BUS
SA PWR
15 VDC Supply Power for
Devices on the SA Bus
0.6 mm (22 AWG)
stranded, 4-wire (2 twisted-
pairs), shielded cable
recommended
Note:
The + and -
wires are one twisted
pair, and the COM
and SA PWR are the
second twisted pair.
TSTAT
TSTAT
RJ-45 8-Position Modular
Connector pr15
VDC Power for:
• MAP Gateway
• VAV Balancing Tool
• One-to-One Wireless
Receiver
24 AWG 3-pair CAT 3 Cable
<30.5 m (100 ft)
HOT
24 VAC Power Supply -
Hot
Supplies 20–30 VAC
(Nominal 24 VAC)
24~
COM
24 VAC Power Supply
Common
The -0 models
isolate this terminal from
all other commons.
The -1 models only isolate
this terminal from the FC
bus common.
0.8 mm to 1.0 mm²
(20 to 18 AWG) 2-wire
1
To determine wire size and cable lengths for cables other than the recommended cables, see Table 5.
2
The N2/FC Bus wiring recommendations in this table are for N2 bus communications at 9,600 baud. For more
information, refer to the
N2 Communications Bus Technical Bulletin (LIT-636018)
.
23
FX-PCV1826/1832 Programmable VAV Box Controller Installation Instructions