SMA SC 400HE Installation - Manual (Page 87)

SMA Solar Technology AG External Connections
Installation Guide SCxxxHE-IEN104432 87
6.9 Serial Interfaces
NET interface
For communication of the Sunny Central Control for data transmission to a PC, modem or Sunny
WebBox, use the NET interface.
RS485 Data Line
Communication between the Sunny Central Control and the optional Sunny String-Monitors (DC
distributor with integrated string current monitoring) occurs via an RS485 data line using the COM1
port of the Sunny Central Control. The RS485 data line of the string current monitoring of the Sunny
String-Monitor is connected to the HUB assembly in the Sunny Central.
Connection of the RS485 data line in the Sunny Central
Cable routing of the serial interface
The cable is fed in together with the communication unit through the sliding plate in the floor
of the AC cabinet.
Position of the HUB assembly
The exact position of the HUB assembly varies according to the Sunny Central. With the
help of the equipment identifier and the provided circuit diagram, the exact position of the
HUB as well as of the NET interface can be determined.
Technical description of the Sunny String-Monitor
The documentation of the Sunny String-Monitors contained in the delivery provides a
detailed description of the installation of the integrated string current monitoring.