IFM Electronic AC1375 Notice De Montage page 12

Contrast setting
The contrast can be dir ectly changed by simultaneously pr essing the
right button and the Δ-button (too bright) or the ∇−button (too dark).
increase contrast
Operation
To operate an AS-i system a special AS-i power supply is r equired (e.g.
AC1216). The AS-i power supply supplies the yellow AS-i cable with
energy and implements a data decoupling to the voltage r egulator of
the power supply . Standar d power supplies would consider the AS-i
data signals as interference signals and suppress them.
Disconnect the power supply befor e connecting the AS-i DP
gateway.
The AS-i system is operated ungrounded. AS-i + and AS-i - are to
be symmetrical to the ground potential of the installation.
Ensure a low-resistance connection of the symmetry point of the
AS-i power supply (terminal "shield") to the ground of the instal-
lation.
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decrease contrast