3 installation, 3.1 network specifications, 3.2 cable specifications – Innotech Genesis II Digital Controller (v5) User Manual
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Genesis II Installation Instructions
Page 104
© Mass Electronics Pty Ltd 2010
Edition 2.0 dated 06/12/2013
5-3 Installation
It is not possible to cover all the situations that may be encountered in the wide range of installations
found in the field. The following examples are provided as a guide to assist in deciding the best
method of connection for a Genesis II System Installation.
Some situations require additional care to avoid hazardous situations. These may be covered by
legislation or regulations such as those set by Telecommunications Authorities, Electrical Wiring
Rules and Local Authorities.
Products of the Genesis II System product line are designed to comply with the Safety Extra Low
Voltage standards and, therefore, any wiring connected to these products should also comply with
these standards if the product compliance is to be maintained.
Communication links between equipment located within different electrical switchboards should
be electrically isolated from one another. The voltages at the earth connections at the switchboards
will usually have a small difference under normal conditions but, if a fault occurs on equipment
connected to one switchboard, the voltage difference can increase dangerously. If a non-isolated
communications link is used, this voltage difference can cause a large current to flow through the
communications cable and the integrated circuits (ICs) connected to it. An isolated connection will
block the current, but it would have to withstand the full supply voltage for up to several seconds.
5-3.1 Network Specifications
The network type and baud rate determine the maximum recommended cable specifications. For
cable runs longer than the recommended lengths an Innotech Repeater IR11 or IR12 should be used.
Repeaters may also be required if the number of devices connected to a network segment exceeds
the maximum allowable number of devices for the specific network.
For detailed installation information, including installation on a system incorporating Innotech MAXIM series
devices, refer t
.
NOTE
For specific instructions for the network installation of Innotech Devices, refer to
NOTE
5-3.2 Cable Specifications
Innotech recommends the use of cables specifically designed for RS485 networks. There are many
cables on the market that meet the specifications for RS485 networks.
Best reliability is achieved through a cable consisting of 2 individually shielded twisted pairs of low
capacitance. Such cables also provide excellent mechanical strength and lowest electrical resistance,
which is beneficial for maximum length cable runs.
Some CAT6 cable types may also be suitable in certain applications. Care should be taken when
using CAT6 for Primary Networks as they frequently omit shielding. CAT6 cables should be shielded in
order to provide reliable communications.