USER MANUAL
EMDCB
–
BLUETOOTH LOW ENERGY MOTION AND ILLUMINATION SENSOR
© 2019 EnOcean | www.enocean.com
EMDCB User Manual | v1.3 | August 2019 | Page 22/67
4.1
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
.
4.2
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
.
4.3
Header
The BLE Header identifies certain radio telegram parameters. Figure 13 below shows the
structure of the BLE header.
Figure 13
–
BLE header structure
4.4
Source address
The 6 byte BLE Source Address (MAC address) uniquely identifies each EMDCB product.
EMDCB supports two source address modes:
◼
Static Source Address mode (default)
In this mode, the source address is constant (but its lower 32 bit can be configured
via NFC interface)
◼
Resolvable Private Address mode (NFC configurable)
In this mode, the source address changes for each transmission according to a pre-
defined scheme
EMDCB uses by default Static Source Address mode.
Resolvable Private Address mode can be selected by setting the
ADDRESS_MODE
field in the
TX_CONFIG register to 0x01 as described in chapter 7.6.7.2.