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Using this document
This quick reference manual provides all the information required for installing, assembling, and starting up a TwinBus
for intercom system. It does not replace the system manual. It provides a basic overview for the most frequent use of
door intercom and video systems in single or multi-family residential buildings. Only those devices specified in the
Contents are described. The system manual can be ordered free of charge via the Internet at www.ritto.de or from
+49 (0) 02773/812-0.
Please keep this Quick Reference Manual on hand for later use.
Explanation of symbols used
Indication of risks:
Important information:
Circuit diagram symbols
Danger!
Type and source of the danger
This danger symbol indicates the risk of personal injury.
Caution!
Type and source of the danger
This symbol indicates the risk of equipment, environment or other property damage.
Note:
This symbol does not represent a safety note. It identifies information to better understand the
respective processes.
This symbol indicates an acoustic signal issued by a device should be observed. The length of the signal
indicates the acknowledgement of settings.
This circuit diagram symbol indicates a twisted pair of wires.
This circuit diagram symbol indicates that the line screening sheaths must be connected across the joints.
