TESTO 6681 Profibus Instruction Manual page 51

As the testo 6681 is the first humidity transmitter with a
Profibus interface, no standardized humidity profile exists at
this point, meaning that Manufacturer-specific should be
selected.
Input Description of the Profibus input measurement channels, i.e.
the parameters that the Profibus interface should be provided
with. With testo 6681, these are the channels Temperature
Transducer and Humidity Transducer.
Output Select the parameter settings for unit, filter time constants,
reading scaling, limit values, etc.
1.3.5.4 Set address

FF must be set at the Profibus module (see chapter 1.3.3.7, page 40).
1 Click on [Set address].
2 Enter addresses and confirm with [Assign Address].
The address is assigned and saved directly.
testo 6681 Profibus
- 1.3 Commissioning 51