Aperio
®
Online Mechanical Installation Guide, Document No: ST-001323-B Date: 21 februari 2014 27
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Connecting to the RS-485 bus
8-24V
GND
RS485 B
RS485 A
The RS-485 bus should be made up of a twisted-
pair cable with characteristic impedance between
90 Ohm and 120 Ohm. Maximum bus length is
about 1000 m. Depending on the EAC system, a
maximum of 32 units (31 communication hubs
plus the EAC, when using the DIP Switch for RS-
485-addressing) can be connected to the same
bus.
Connect all RS485 A connectors together and
all RS485 B connectors together, depending on
connection type, see Figure 8 and Figure 9 on page
26.
Connecting to supply voltage
Connect the wires to 8-24 VDC, 0.9 W and GND
(ground) on the communication hub.
Note! The power supply shall be a Limited Power
Source (LPS) according to EN 60950-1. The power
supply shall be 3 A over current protected. Wire
requirements 16-22 AWG.
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