5 Installation and Connection
(continued)
C232-302-401/402/403/404-603 / C232/EN M/A23 5-11
5.6.2 Connecting the Serial Interfaces
PC interface
The PC interface is provided in order to operate the unit from a personal computer (PC).
!
The PC interface is not designed for permanent connection. Consequently, the female
connector does not have the extra insulation from circuits connected to the system that
is required per VDE 0106 Part 101.
Communication interface
The communication interface is provided for permanent connection of the unit to a
control system for substations or to a central substation unit. The unit is connected
either by a special fiber-optic connector or an RS 485 interface with twisted copper
wires, depending on the type of communication interface.
The selection and assembly of a properly cut fiber-optic connecting cable requires
special knowledge and expertise and is therefore not covered in this operating manual.
!
The fiber-optic interface may only be connected or disconnected when the supply
voltage for the unit is shut off.
The RS 485 interface must be connected to other units is by a 2-pole twisted conductor
cable. Additional instructions for connecting the communication interface can be found
in the manual entitled ‘Bus Technology’.
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