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8.5.4 Ward bus<br />
Group bus<br />
GE<br />
Terminating<br />
resistor<br />
2.7 kOhm<br />
The maximum permissible cable length of the ward bus is 700 m.<br />
The maximum number of users on the ward bus is 40.<br />
The following devices are ward bus users:<br />
CONCENTO PLUS - <strong>Technical</strong> <strong>Manual</strong>, 11/12 (Rev. 3.0), 00 8814 14<br />
8. Laying cables<br />
Terminals SD6 P<br />
Terminals S4 P<br />
Terminals S4 B<br />
Display module<br />
Call/presence combination bus (RAB)<br />
Corridor displays (maximum 10 per ward bus)<br />
Management Interface (maximum 1, when connected to ward bus)<br />
It is recommended to lay the ward bus as a ring. The last part of the ring between<br />
the last user and the Group Electronic (GE) is however not connected. It serves<br />
merely as a reserve in the event that faults occur in the ward bus.<br />
The ward bus must am be connected at the first and last user with a 2.7 kOhm<br />
terminating resistor between IA and IB. The resistor is already present in all<br />
devices (apart from the corridor displays) and only needs to be activated via a<br />
DIP switch or jumper.<br />
Terminating<br />
resistor<br />
2.7 kOhm<br />
Terminal<br />
Ward bus: IY(ST)Y 4x2x0.8 mm, max. 700 m<br />
Terminal<br />
RAB<br />
max. 40 ward bus users<br />
Terminal Terminal Display<br />
module<br />
Terminal<br />
65
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