USER MANUAL V1.0
© 2016 EnOcean | www.enocean.com
F-710-017, V1.0
PTM 535Z User Manual | v1.0 | March 2016 | Page 37/38
PTM 535Z – 2.4 GHZ PUSHBUTTON TRANSMITTER MODULE
A.4
Interpretation of the telegram data
The following parameters within captured radio telegrams are typically of interest:
1.
MAC Payload
This will contain the ID of the sender, various control and security data fields as well
as the actual command data (1 byte)
The structure of this field is outlined subsequently in more detail.
2.
RSSI
This will show the received signal strength
3.
FCS
This will show the frame integrity (OK / not OK) and should normally show “OK”.
A.4.1
MAC Payload
Below is an example of a captured MAC payload for a secure data telegram (see chapter
3.4.1):
The hexadecimal representation of this specific payload is:
8C 30 57 21 71 30 04 CD BB AA 22 84 D1 99 78
The location and interpretation of key parameters is described in the following chapters.
A.4.2
Device ID
The 4 byte device ID is used to uniquely identify each device in the network. In the case of
secure data telegrams it is located at byte 2…5 of the MAC payload as highlighted below:
8C 30
57 21 71 30
04 CD BB AA 22 84 D1 99 78
Keep in mind that the byte order is little endian, therefore the ID of this specific device is
0x30712157.
A.4.3
Sequence Counter
The sequence counter is used to uniquely identify each telegram in order to avoid telegram
replay. The sequence counter is 4 byte long and only present if PTM 535Z operates in se-
cure mode.
In the case of a secure data telegram, the sequence counter is located at byte 6…9 of the
MAC payload as highlighted below:
8C 30 57 21 71 30
04 CD BB AA
22 84 D1 99 78
Keep in mind that the byte order is little endian, therefore the current sequence counter
value of this specific device is 0xAABBCD04.
