Stand-Alone Operation - SMA Sunny Island SIC50-MPT Installation Manual

Electrical Connection
6.6.4 Stand-alone Operation
Up to 8 charge controllers can be connected to each other. Connect the MSTE bus input of the charge
controller with the MSTE bus output of the following charge controller. Use an RJ45 cable for this.
Pin Assignment of the MSTE Bus
Pin Function
4 GND
3 TXD bus / RXD bus
9 Shield, protective earth
28 SIC50-IA-en-11
Level
0 V
TTL, open collector
SMA Solar Technology AG
Description
reference potential
resting potential: +5 V
active: 0 V
Installation Guide