Rs-485 Cable Requirements; Selecting Power Cable; Power Cable - Dahua SD22204DB-GC Installation Manual

Table 1-1 Cables and maximum transmission distance (network)
Model
RG59/U
RG6/U
RG11/U
Table 1-2 Cables and maximum transmission distance (HDCVI)
Model
SYV-75-3

1.3.2 RS-485 Cable Requirements

When using 0.56 mm (24AWG) twisted-pair line, depending on different baud rates, the theoretical
maximum transmission distance is different.
Baud Rate
2400bps
4800bps
9600bps
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.
● For 24 VAC power supply, see "5 Cable Diameter (24 VAC) and Transmission Distance".
● For 12 VDC power supply, see "6 Cable Diameter (12 VDC) and Transmission Distance".
● For 24 VDC power supply, see "7 Cable Diameter (24 VDC) and Transmission Distance".
● For 30 VDC power supply, see "8 Cable Diameter (30 VDC) and Transmission Distance".
● For 36 VDC power supply, see "9 Cable Diameter (36 VDC) and Transmission Distance".
Maximum Transmission Distance (ft/m)
750 ft/229 m
1,000 ft/305 m
1,500 ft/457 m
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
2