EnOcean GmbH PTM215B ユーザーズマニュアル

USER MANUAL

PTM 215B – 2.4 GHZ Pusbutton Transmitter Module

F-710-017, V1.0

PTM 215B User Manual | v0.8 | September 2016 | Page 28/42

2.11.4.3 Security Key Write register

The Security Key Write register is 16 byte wide and contains the device-unique random

security key.

The factory programmed key can be replaced with a user defined key by following these

steps:

1. Write new security key into the Security Key Write register

Note that for security reasons, setting the Security Key to the following values is not

possible:

0x00000000000000000000000000000000

0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF

If the Security Key Write register is set to one of these values then no update of the

Security Key will occur.

2. Set the Update Security Key flag in the Configuration register to 0b1

3. If the key should be write-only (not readable after the key update) then set the Pri-

vate Security Key flag in the Configuration register to 0b1

4. Actuate (press and release) PTM 215B

PTM 215B will determine that it should modify the security key based on the setting of the

Update Security Key flag and copy the value of the Security Key Write register to the Secu-

rity Key register in private memory.

After successful execution, PTM 215B will clear the Update Security Key flag to 0b0.

If the Private Key flag in the Configuration register is set to 0b0 then the content of the Se-

curity Key Write register will be maintained at its current value. This addresses use cases

where the security key shall be readable for users having the correct PIN code.

If the Private Key flag in the Configuration register is set to 0b1 then the content of the Se-

curity Key Write register will be cleared to 0x00000000000000000000000000000000 after suc-

cessful execution. This addresses use cases where the security key shall never be readable

(even for users having the correct PIN code). The Security Key Write register will maintain

this value of 0x00000000000000000000000000000000 even if the Private Key flag in the Con-

figuration register is subsequently cleared to 0b0. This ensures that it is not possible to

read a security key which was written with the If the Private Key flag in the Configuration

Note that it is not possible to read the current security key via NFC if the Security Key Write

sary to write a new security key (as described above) or to reset the device to its default

security key by means of a factory reset.

The protected memory is designed to support 1000 modifications of the security key.