52
53
Device LED feedback messages
Duty cycle
9 Device LED feedback messages
9.1 Flash codes
The device LED indicated the status of both
channels.
Various actuator states are indicated by the device
LED flashing:
Flashing code
Meaning
Slow flashing
Teach-in mode
Fast flashing
Reset
One long, one short
Duty cycle reached (see
sec. “10 Duty cycle” on
page 53)
One long, two short
Device defective
9.2 Operational status display
The device LED will light up continuously as soon as a
device relay picks up.
Once the actuator has been configured via the central
control unit or a programming tool, the device LED
will indicate other device states in addition to those
already described (e.g . on and off delay).
10 Duty cycle
The duty cycle is a legally regulated limit of the trans-
mission 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 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 iso-
lated instances during start-up or initial installation of a
system. If the duty cycle is exceeded, this is indicated
by one long and one short red flash of the device
LED, and may manifest itself in the device temporarily
working incorrectly. The device starts working correctly
again after a short period (max. 1 hour).