EnOcean Temperature and Humidity Sensor with transmitter : User's Manual : Page 32

USER MANUAL

PTM 210 / PTM 215 / PTM 215U / PTM 215J

DC Step code and later

Once the key was written the PTM 215 will automatically use the new written key and reset

the RLC sequence to 0x0.

To return to the factory defined key a factory reset as described in chapter 3.4 must be

executed.

Note that the USER_KEY register is a write-only register meaning that it is not

possible to read back a user-defined security key.