RS485 connection X2
Note
A detailed description for using this function is provided in the section entitled Domestic
connection monitoring (post-meter fuse).
Schematic diagram
5 Meter 1 (domestic connection meter) 7 Wallbox connection terminal block
6 Meter 2 (optional, photovoltaic meter)
The RS485 connection X2 is used for communicating with up to two smart electricity meters using
the Modbus protocol (for a list of supported types and the corresponding parameters and terminal
assignments for the installed meter, see section Meters with Modbus RTU (RS485) interface). In
addition to the RS485 data cables on terminal X2.1 and X2.2, there is an earth connection available
on terminal X1.2 (Gnd) for the cable shield. We recommend that you use a shielded, twisted
connection cable (>0.5mm²).
The cable shield must not be connected to the protective conductor potential (for example, Shd
connection) at any other point. The Gnd is to be connected to the meter depending on availability.
Note
Terminal X1.2 (Gnd), the Gnd cable on the RS485 cable or its shield must not be routed on
the shield support Shd of the Ethernet1 connection X4.
Note
Detailed information about the electrical connection of the meter is provided in the installation
instructions supplied by the meter manufacturer.
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