Innotech Genesis II Digital Controller (v5) Manuel d'utilisateur télécharger pdf (Page 110)

Genesis II Installation Instructions

Page 110 © Mass Electronics Pty Ltd 2010Edition 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 dierent 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

1 2 ... 105 106 107 108 109 110 111 112 113 114 115 ... 123 124

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Innotech Genesis II Digital Controller (v5) Manuel d'utilisateur Page 110