USER MANUAL PREVIEW
PTM 535BZ
–
BLUETOOTH AND ZIGBEE GREEN POWER PUSHBUTTON TRANSMITTER
© 2021 EnOcean | www.enocean.com
F-710-017, V1.0
PTM 535BZ User Manual | v1.0 | May 2021 | Page 30/112
4.3
Telegram format
PTM 535BZ transmits ZGP radio telegrams in the 2.4 GHz band according to the Zigbee Green
Power specification
as lower layer standard. Please refer to
these specifications for detailed, up to date information.
below summarizes the high-level IEEE 802.15.4 / Zigbee Green Power frame struc-
ture. The content of these fields is described in more detail in the next chapters.
Figure 22
–
IEEE 802.15.4 / Zigbee Green Power frame structure
4.3.1
Data integrity
Correct reception of the IEEE 802.15.4 frame is ensured using a 2 byte Cyclic Redundancy
Check (CRC16) which forms the IEEE 802.15.4 MAC Trailer field.
4.3.2
Byte order
ZGP uses little endian byte order meaning that if a data structure (e.g. Source Address,
Frame Control or Sequence Number) is bigger than 1 byte then the least significant byte is
transmitted first. Considering the case of the 4 byte Source Address
0x01501234
, these 4
bytes will be transmitted (and received) in the order
0x34
first,
0x12
second,
0x50
third and
0x01
last.
4.3.3
IEEE 802.15.4 PHY Header
The IEEE 802.15.4 PHY header consists of the following fields:
◼
Preamble (4 byte long, always
0x0000:0000
)
◼
Start of Frame (1 byte long, always
0xA7
)
◼
Length of Frame (1 byte long, length depending on ZGP payload length)
The structure of the IEEE 802.15.4 PHY header is shown in
Figure 23
–
IEEE 802.15.4 PHY header structure