TESTO 6681 Profibus Instruction Manual page 53

1 Click on [Read Device Settings].
The display of the instrument settings is updated and the parameters,
units and status of the write lock are thereby adopted in the
testo 6681.
2 Select Write locking Off and click on [Apply read-only settings].
Write protection is now deactivated.
3 In the Channel Settings list field, set the required parameters via the
Channel 1 and Channel 2 pull-down menus.
Using Profibus, the temperature can only be set on channel 1.
The humidity values on the other hand can be set on both
channels, but a humidity value selected on one measurement
channel cannot be set on the other measurement channel.
The units are updated when the parameter is changed. Alternative
units that correspond to the parameter can be set using the pull-down
menu.
4 Confirm with [Apply Channel Settings].
The values are updated, the status was changed.
Relay parameters tab

In the user menu of the testo 6681 or in the P2A software, the relay
status Not used or Profibus is set. Otherwise the message
no access appears from Profibus.
With P2A software
or user menu
testo 6681 Profibus
Profibus
Not used
MIN
MAX
General alarm
- 1.3 Commissioning 53
With Profibus
parameterization
tool