Fronius Ig Plus Inverter With Modbus Card; Communication Cable; Inverter Connection - Circutor CDP Application Notes

3.- FRONIUS IG PLUS INVERTER WITH MODBUS CARD

The CDP and the inverter communicate via an RS-422 bus. This RS-422 bus can
connect up to 100 inverters, although the number of inverters in the vast majority
of domestic installations ranges from 1 to 3.
For data communication between inverters, each inverter must have a Com Card
communications card installed (this card is ordered as optional for the inverters).

3.1.- COMMUNICATION CABLE

List of communication cable terminals between the CDP and the inverter:
R2 channel communications
connector
Terminal
1
4
2
3

3.1.1. INVERTER CONNECTION

Figure 6 shows the connection between the CDP and a single inverter.
The communication cable must be connected to the inverter "OUT" terminal and
the bus end terminal must be connected to the "IN" terminal.
Figure 7: Connection between a CDP and a single Fronius IG Plus inverter.
12
Table 4: List of communication cable terminals.
CDP
Description
TxD+
RxD+
RxD -
TxD -
INVERTER
Conector OUT (RJ45)
Terminal Description
3 RxD+
4 TxD+
5 TxD-
6 RxD-
Application notes
CDP