Siemens PCIN is a specialized serial communication software used for data transfer between (such as the 810M, 840C, or 802 series) and a PC or PG . It allows users to back up and restore critical data, including part programs, machine data, archives, and PLC application programs, via an RS-232 serial interface. Downloading PCIN Software

It does NOT work with 840D solution line or 828D (use USB/network instead).