P/N 66109923001 Rev. A
7
S-NET WIRING
S-Net is a serial network for communication between the ACU and node devices. Typically, the
cable used is two twisted-pairs with an overall shield; one pair is for data, the other pair is for
DC power. While the maximum length of an S-Net branch is 4,000 feet (1200 meters), it is
recommended that separate twisted-pair cables for data and power when lengths exceed 500
feet (150 meters). Table 4 lists recommended cable.
Table 4: Recommended S-Net Cable
Type
Description
Gauge
S-Net Length < 500 Feet
Data and Power
Belden 9552
Belden 1069
2-Pair
18 AWG
16 AWG
S-Net Length > 500 Feet
Data Only
Belden 9841
1-Pair
24 AWG
S-Net Length > 500 Feet
Power Only
Belden 9341
Belden 9342
Belden 9343
2-Conductor
18 AWG
16 AWG
14 AWG
S-Net cable should be installed as a single cable; splices should be soldered or secured with
crimp lugs. Drop-lines to a S-Net devices should not exceed 6 feet (1.85 meters) in length.
S-NET
DEVICE
DROP
MAXIMUM LENGTH
6 FT (1.85 M)
DO NOT TERMINATE
S-NET RUN
MAXIMUM LENGTH
4000 FT (1200 M)
TERMINATE AT EACH END
CRIMP LUGS
OR SOLDER
Figure 10: Drop Wiring
