User's Manual

USER MANUAL
PTM 215ZE – 2.4 GHz IEEE 802.15.4 Pushbutton Transmitter Module
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3.3 Payload Structure
The MAC Payload is encoded to be compatible with the zigbee Green Power protocol. Figure
6 below shows the MAC Payload structure for data telegrams.
Figure 6 – MAC Payload structure for data telegrams
The following fields are used for the MAC Payload of data telegrams:
 Telegram Control (2 byte)
The Telegram Control field is set to 0x308C to identify a secure telegram with device-unique
key
 Source ID (4 byte)
The Source ID field contains a 4 byte ID uniquely identifying each PTM 215ZE device
 Sequence Counter (4 byte)
The Sequence Counter field contains an always incrementing counter.
Security processing is based on the combination of the Command and Sequence Counter
in order to prevent replay attacks (sending the same telegram again)
 Command (1 byte)
The Command field is a one byte field which identifies the state of the PTM 215ZE contacts.
For the encoding please refer to Table 2 below.
 Telegram Signature (4 byte)
The Telegram Signature field is used to validate the telegram authenticity. The telegram
signature is calculated based on the telegram payload using AES128 (CBC mode). For
details, see chapter 4
In addition to data telegrams, PTM 215ZE can also transmit commissioning telegrams as
described in chapter 5.3