SIMATIC RTU3010C - compact low-power RTU; Battery or solar-operated; connection ext. power supply 10.8 V to 28.8 V DC; Connection external Modems; Connection to Telecontrol Server Basic DNP3, IEC 60870-5-104 and SINAUT ST7 protocols; onboard I/Os: 8 DI, 4 DO, 4 AI; FTP client; Configuration/diagnostics via web server; Time synchronization; E-mail; SD card slot.