Innotech Genesis V4 System - Manual (Page 84)

Installation Instructions for Innotech Genesis Systems
Edition 011100
A-3
A-4.1. GENESIS II COMMS WIRING TOPOLOGY. Bus topology is produced
by connecting from one device to the next and then on to the next (Figure A-1). A simple
means to identify if bus topology is used is to check that:
•
There are TWO end connections, and
•
Any joining is made between TWO cable ends only.
Three or more cable ends at a joint indicates it is Star topology. The total continuous length of
cable in one section is 1000 metres maximum. In the Star Topology, note that a joint in each
of the diagrams has three or more cable ends joined together. In the ring topology, note that
there are no end connections.
Figure A-1. Correct and Incorrect Bus Topology.
A-4.1.1. Adding Modules to the Comms Link. To insert another module into
the Comms link, make a looping connection through it as in Example A of Figure A-2.
Alternatively, use a GENII RPTR Repeater Module to branch-off to the new module as in
Example B of Figure A-2. Note that the four devices and Port 1 of the Repeater Module are
connected in bus topology. Port 2 of the Repeater Module and the added device form a
separate network linked by the electronics within the Repeater Module.
Always maintain bus topology on the network when adding another module to the network.
Figure A-2. Adding Modules to a Network.
Bus Topology Bus Topology
CORRECT
Star Topology Star Topology Ring Topology
WRONG
Added
Module
Example A
Example B
Repeater
2
1
Added
Module