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 39/112
4.4.3
Decommissioning telegram
Transmission of a decommissioning telegram can be selected only via the NFC interface.
The payload of decommissioning telegrams is 12 byte long and shown in
Figure 34
–
Structure of ZGP decommissioning telegrams
For security reasons, SECURITY_KEY2 will be automatically updated by PTM 535BZ to a new
random value when a decommissioning request is transmitted. This prevents the case of
using the same security key in different networks.
4.4.4
Data telegram authentication
PTM 535BZ implements telegram authentication for transmitted ZGP data telegrams as spec-
ified by the ZGP specification. This ensures that only telegrams from transmitters using a
previously exchanged security key will be accepted by the receiver. Refer to the ZGP speci-
fication
for details about ZGP data telegram authentication.
4.5
Channel selection
ZGP uses the IEEE 802.15.4 radio standard
for telegram transmissions which defines 16
radio channels
(designated as Channel 11 … Channel 26)
as described in
Chapter 4.1
The radio channel used for communication is selected when a ZGP network is formed and
usually remains the same throughout the lifetime of the network. The channel selection pro-
cess is designed to ensure that a certain channel quality (low disturbances) is achieved.
Four of the 16 radio channels (Channel 11, Channel 15, Channel 20 and Channel 25) are
designated as Primary Channels and will be tried first in the channel selection process. Most
ZGP networks therefore operate on one of these four primary channels.
Devices within a ZGP network can receive radio telegrams from PTM 535BZ only if PTM 535BZ
uses the same radio channel as the ZGP network. PTM 535BZ therefore has to be configured
to use the right radio channel. This process is called channel selection.
Channel selection can either be executed via the NFC interface or via the LRN button. Both
options are described below.
