User's Manual

USER MANUAL PREVIEW
PTM 535BZ – BLUETOOTH AND ZIGBEE GREEN POWER PUSHBUTTON TRANSMITTER
© 2022 EnOcean | www.enocean.com F-710-017, V1.0 PTM 535BZ User Manual | v1.2 | July 2021 | Page 16/121
3.2 Radio transmission sequence
PTM 535BZ transmits BLE telegrams in its standard configuration by using so-called BLE
Advertising Events as defined in [2]. Each data or commissioning telegram is transmitted as
a sequence of redundant advertising events which all contain the same telegram payload.
For reliability reasons, PTM 535BZ will send each telegram using several (minimum two) BLE
advertising events. This approach increases transmission reliability by providing redundancy
in time (by transmitting the same telegram at different times) and redundancy in frequency
(by transmitting the same telegram on different radio channels).
The default radio channels are the advertising channels (Channel 37, 38 and 39); they can
be changed to different radio channels via the NFC configuration interface as described in
Chapter 5.6.3 and Chapter 5.6.7.
The default interval between the BLE advertising events is 20 ms; this interval can be reduced
to 10 ms via the NFC configuration interface as described in Chapter 5.6.3.
The resulting transmission sequence is shown in Figure 6 below for the case of data telegram
transmission with default configuration parameters.
Figure 6 – BLE radio transmission sequence