Table 4: 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
HOT
24 VAC Power Supply - Hot
Supplies 20–30 VAC (Nominal 24VAC)
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 mm
(20 to 18 AWG) 2-wire
1
See Table 3 to determine wire size and cable lengths for cables other than the recommended cables.
2
The SA Bus and FC Bus wiring recommendations in this table are for MS/TP Bus communications at 38.4k baud. For more
information, refer to the
Metasys IP Networks for BACnet/IP Controllers Configuration Guide (LIT-12012458).
and
MS/TP Communications
Bus Technical Bulletin (LIT-12011034).
VMA1615/1626/1628/1630 VAV Controllers Installation Guide
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