User's Manual

USER MANUAL
PTM 215B – 2.4 GHZ Pusbutton Transmitter Module
© 2016 EnOcean | www.enocean.com F-710-017, V1.0 PTM 215B User Manual | v0.8 | September 2016 | Page 16/42
2.9 BLE frame structure
PTM 215B transmits radio telegrams in the 2.4 GHz band according to BLE frame structure.
For detailed information about the BLE standard, please refer to the applicable specifica-
tions.
Figure 8 below summarizes the BLE frame structure.
Figure 8 – BLE frame structure
The content of these fields is described in more detail below.
2.9.1 Preamble
The BLE Preamble is 1 byte long and identifies the start of the BLE frame. The value of the
BLE Preamble is always set to 0xAA.
2.9.2 Access Address
The 4 byte BLE Access Address identifies the radio telegram type. For advertising frames,
the value of the Access Address is always set to 0x8E89BED6.
2.9.3 Header
The BLE Header identifies certain radio telegram parameters. Figure 9 below shows the
structure of the BLE header.
Figure 9 – BLE header structure