Troubleshooting; Command Not Confirmed; Duty Cycle - HomeMatic HmIP-PSM-UK Operating Manual

function. If the test is completed without errors, the plug-
gable switch and meter transmits a wireless telegram con-
taining its status information.
8

Troubleshooting

8.1

Command not confirmed

If at least one receiver does not confirm a command, the
device LED lights up red at the end of the failed trans-
mission process. The failed transmission may be caused
by radio interference (see "11 General information about
radio operation" on page 16). 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
8.2

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
Troubleshooting
15