Lync AEGIS Controller
8: APPENDIX D
L-OMM-013_A
• 4/20/2022Technical Support • (800) 433-5654 • Mon-Fri, 8 am - 5 pm EST
92
of
100
Warnings For The Realization Of Network Rs-485
•
Perform all installation and maintenance work with the unit switched off;
•
Use shielded wires for serial connections: 2 wires + shield; do not make star
connections (use chain connections);
•
Connect the shield to the GND clamp and insert the two termination resistors of 120
ohm ¼ Watt at the ends of the network (resistors are not supplied);
•
The length and section of the wires must comply with the table below;
•
We recommend the heading of the conductors with terminal pins of appropriate section
to avoid possible short-circuits in the various conductors.
Characteristics Of The Serial Cable To Be Used
•
Cable impedance: 120 Ohm (indispensable characteristic)
•
Capacitance: approximately 40 pf/m (optional characteristic)
•
Signal propagation time: 5 ns/m (optional characteristic)
•
A table is shown below with suggested shielded cables depending on the various installations.
The Belden codes shown here comply with all the required specifications; cables produced by
other manufacturers can be used provided they comply with the specifications shown below.
Section
(AWG)
Section
(mm²)
Resistance
(Ω/km)
Max length
(m)
Belden code (*)
16
1,50
13,7
1173
9860
18
1,00
22,6
711
3074F
22
0,50
48,2
333
3105A
24
0,22
78,7
204
9841 o 8103
(*) Suggested type of shielded cable
Depending on the presumed length of the network, you may use cable of a lesser section. For
example, for a maximum length of 300 m, an AWG 22 cable is sufficient.
