Innotech Genesis II Digital Controller (v5) - Manual (Page 110)

Genesis II Installation Instructions
Page 110 © Mass Electronics Pty Ltd 2010 Edition 2.0 dated 06/12/2013
Example Figure 5-8:
This example shows a Genesis II Direct Digital Controller with a network of REMs, where there is a
Innotech Repeater IR11 located in the middle of a run.
5-3.5 Genesis II System Comms Wiring Considerations
The maximum number devices that can be connected on one section of Comms cable is 31. This
limit is set by the characteristics of the RS485 ICs. To increase the number of nodes or devices on a
system, an Innotech Repeater IR11 or IR12 should be used ( Figure 5-9 ).
The maximum length of Comms cable for the Primary Network is 400 metres (at default 57,600 Baud
Rate) or 1000 metres (at optional 9,600 Baud Rate). This limit is determined by the characteristics of
the RS485 ICs and by the characteristics of the cable. To increase the maximum cable length on a
system, an Innotech Repeater IR12 should be used.
The maximum length of Comms cable for the REM Network is 600 metres. To increase the maximum
cable length on a system, an Innotech Repeater IR11 should be used.
In practice, the maximum length of cable is determined by the quality of the signals. The signal will
be degraded by using cable which does not meet the RS485 cable specification and by installing the
cable in locations where it is subject to interference from other cables and equipment. In severe
cases, it may not be possible to have 31 nodes on one section of cable, or to match the defined
maximum cable length.
The two ports on an Innotech Repeater IR11 or IR12 module reside on different sections of the system
and each section can have up to the maximum of 31 nodes. With a one repeater, a total of 62 nodes
can be connected on the system. A repeater can be connected at any point on the network providing
bus topology is maintained. Multiple repeaters can be used, with the maximum number of Genesis II
System devices allowed being 128
The Innotech Repeater IR11 has the EOL jumper fitted on Port 1 but not Port 2.
NOTE
Figure 5-8: REM Network with Innotech Repeater IR11 in the middle of a run
The maximum number includes the number of Repeater Modules used in the system.
NOTE