Manual HomeMatic HmIP-SMI55-A (page 46 of 53) (English, German)

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Troubleshooting

10.2 Command not conﬁrmed

If at least one receiver does not conﬁrm a command, the

device LED (E) lights up red at the end of the failed trans-

mission process. The failed transmission may be caused

by radio interference (see „13 General information about

radio operation“ on page 50). This may be caused be

the following:

• Receiver cannot be reached.

• Receiver is unable to execute the command (load

failure, mechanical blockade, etc.).

• Receiver is defective.

10.3 Duty cycle

The duty cycle is a legally regulated limit of the transmis-

sion time of devices in the 868 MHz range. The aim of

this regulation is to safeguard the operation of all devices

working in the 868 MHz range.

In the 868 MHz frequency range we use, the maximum

transmission time of any device is 1% of an hour (i.e. 36

seconds in an hour). Devices must cease transmission

when they reach the 1% limit until this time restriction

comes to an end. Homematic IP devices are designed

and produced with 100% conformity to this regulation.

During normal operation, the duty cycle is not usually

reached. However, repeated and radio-intensive teach-

in processes mean that it may be reached in isolated in-

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HomeMatic HmIP-SMI55-A Manual

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