16
Communication speed
(bit/sec)
Length in meters
50nF/Km
9600 1200
19200 900
38400 700
Table 3 - Length of RS485 Data Cables shielded (m)
Caution:
If the distance between the reader and the Multi
device is more that 15 m you need to change the
RS485 switch position to insert the 120 ohm
termination resistor. Refer to the Multi Device
Anatomy chapter
Wiegand reader cables
The wires used to connect Multi device with third party Wiegand
readers are those specified into the reader technical specification.
Input wires
Use a twisted pair cable for the contacts connections.
For outdoor wiring is mandatory to use shielded cables.
For internal wiring without shielded cables is recommended an
electrical environment where the cables are well separated, even at
short runs, especially to whom can be essentially subjected to
interference.
The following table lists wire gauges and distances for Inputs.
Cable type Max distance (m)*
AWG mm2 Ohm/km
14 2 8.8 1420
16 1.3 14 893
18 0.9 21 595
20 0.52 34 368
22 0.35 52 240
24 0.2 85 147
26 0.13 137 93
Table 3 Length of Input cables
*One-volt voltage drop is considered typical.
Output cable
Cable used for connecting output should have a MAX size of 2 mm
that it is AWG14.
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