USER MANUAL
EMDCB
–
BLUETOOTH LOW ENERGY MOTION AND ILLUMINATION SENSOR
© 2019 EnOcean | www.enocean.com
EMDCB User Manual | v1.3 | August 2019 | Page 18/67
3.2
Default radio transmission sequence
EMDCB transmits telegrams in its standard configuration by using so-called Advertising
Events.
An advertising event is defined as the transmission of the same radio telegram on all se-
lected radio channels (by default this would be on BLE Channel 37, 38 and 39) one after
another with minimum delay in between.
For reliability reasons, EMDCB will send three advertising events for each reporting event.
The resulting transmission sequence is shown in Figure 7 below. The default interval setting
is 20 ms; an alternative setting of 10 ms can be configured via NFC (see chapter 7.6.4.2).
CHANNEL 37
CHANNEL 38
CHANNEL39
INTERVAL
(20ms or 10ms)
CHANNEL 37
CHANNEL 38
CHANNEL39
CHANNEL 37
CHANNEL 38
CHANNEL39
INTERVAL
(20ms or 10ms)
Figure 7
–
Default radio transmission sequence
3.3
User-defined radio transmission sequences
In certain situations it might be desirable to transmit radio telegrams on channels other
than the three advertising channels.
EMDCB therefore allows selecting the radio channels to be used for the transmission of data
telegrams and commissioning telegrams. The following transmission modes are supported:
◼
Both commissioning telegrams and data telegrams are transmitted on the advertis-
ing channels as three advertising events. This is the default configuration and de-
scribed in chapter 3.2 above.
◼
Commissioning telegrams are transmitted on the advertising channels as three ad-
vertising events while data telegrams are transmitted in a user-defined sequence as
described below.
◼
Both commissioning and data telegrams are transmitted in a user-defined sequence
as described below.
The selection of the transmission mode is done using the
TX_CHANNEL_MODE
field of the
TX
register of the NFC configuration interface as described in chapter 7.6.3.
