User's Manual

USER MANUAL

PTM 215B – 2.4 GHZ Pusbutton Transmitter Module

Figure 13 – Data telegram payload structure

2.9.6.2 Commissioning Telegram Payload

The payload of commissioning telegrams is 31 bytes long and consists of the following

fields:

n Length (1 byte)

The Length field specifies the combined length of the following fields. For PTM 215B

commissioning telegrams, this field is always set to 0x06 (6 byte) for the “Short Name”

field and to 0x17 (23 byte) for the “Manufacturer-specific Data” field

n Type (1 byte)

The Type field identifies the data type used for this telegram. For PTM 215B commission-

ing telegrams, this field is set to 0x08 for the “Short Name” field and to 0xFF for the

“Manufacturer-specific Data” field

n Short Name

The Short Name field identifies PTM 215B using the string “P215B”

n Manufacturer ID (2 byte)

The Manufacturer ID field can be used to identify the manufacturer of BLE devices based

on assigned numbers. EnOcean has been assigned 0x03DA as manufacturer ID code

n Sequence Counter (4 byte)

The Sequence Counter is a monotonously incrementing counter used for security pro-

cessing. It is initialized to 0 at the time of production and incremented for each telegram

(data telegram or commissioning telegram) sent.

n Security Key (16 byte)

Each PTM 215B device contains its own 16 byte device-unique random security key

which is generated and programmed during manufacturing. It is transmitted during

commissioning to enable the receiver to authenticate PTM 215B data telegrams

Figure 14 below illustrates the commissioning telegram payload.

Figure 14 – Commissioning telegram payload structure