Rs-485 Cable Requirements; Selecting Power Cable - Dahua D-SD59225DB-HC Installation Manual

Model
SYV-75-3

1.3.2 RS-485 Cable Requirements

When using 0.56 mm (24 AWG) twisted-pair line, depending on different baud rates, the theoretical
maximum transmission distance is different.
Baud Rate
2400 bps
4800 bps
9600 bps
The maximum transmission distance will be reduced in the following conditions: When thinner
communication cables are used; the Device is used in places with intense electromagnetic
interference; too many devices are connected to the RS-485 cable. Otherwise, maximum
transmission distance will be increased.

1.3.3 Selecting Power Cable

1.3.3.1 Power Cable
Depending on the power cable specification, the same cable diameter corresponds to different
transmission distance.
1.3.3.2 PoE Power Cable
POE Specification
AF
AT
HiPoE or BT
Table 1-2 Cables and maximum transmission distance (HDCVI)
Maximum Transmission Distance (ft/m)
720P (25 fps/30 fps): 1,640 ft/500 m
720P (50 fps/60 fps): 984 ft/300 m
1080P (25 fps/30 fps): 984 ft/300 m
Table 1-3 Theoretical maximum transmission distance
Maximum Transmission Distance
1800 m
1200 m
800 m
Table 1-4 PoE power cable
Network Cable Specification
CAT5E and network cables with higher standard.
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