15
Wires Characteristics
Use this chapter to understand the types of wire you need to use for
your plant.
Power supply wire
Multi device can be powered either with a 10V-30V DC third party
power supply, with PoE or with PoE+.
To determine the correct size for power cables need to be used for
third party power supply, refer to the below table (The following table
lists examples of wire gauge and distance for a 12V):
Type of cable
Length (m) at different currents
AWG
mm2
Ohm/Km
600 mA
1200 mA
2400 mA
16
1.3
14
119
60
30
18
0.9
21
79
40
20
20
0.6
34
49
25
12
22
0.35
52
32
16
8
Table 1 - Length of Power Supply cables [m]
Warning:
The above table shows the values for a single Multi device;
if more than one Multi needs to be connected to the same line, divide
the length by the number of the devices.
Network wire
For POE+ and POE: Cat5 or Cat6 Ethernet cable has to be used.
Readers wires
RS485 Data Cables (for OSDP reader connection)
Data cables used with RS485 must be twisted-pair and with 120 ohm
impedance.
Refer to Table 2 for the size of data cables to be used for this
connection with cable with AWG from 24 to 16 not shielded.
Communication
speed (bit/sec)
Length in meters in relation to the cable capacity
50nF/Km
100nF/Km
200nF/Km
500nF/Km
9600
1000
500
250
100
19200
500
250
125
50
38400
240
120
60
24
Table 2 - Length/Capacity of RS485 Data Cables not shielded (m)
Refer to Table 2 for sizing data cables to be used for RS485
connection with cable with AWG from 24 to 16 shielded.
