Aperio
®
Online Mechanical Installation Guide, Document No: ST-001323-B Date: 21 februari 2014
27
Aperio
®
Online
Connecting to the RS-485 bus
8-24V
GND
GREEN
RED
DATA0
DATA1
RS485 B
RS485 A
1
2
3
4
5
6
7
8
ON
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
.
