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Title: Technical Overview and Procedure for Downloading and Utilizing PCIN Software for Siemens CNC Systems

Abstract: This paper provides a comprehensive technical guide to the PCIN software suite, a legacy DOS-based communication tool developed by Siemens for data transfer between personal computers and Siemens Sinumerik CNC controls (notably the 810, 820, 840C, and early 840D systems). As manufacturing facilities increasingly rely on modern Windows environments, the usage of legacy tools like PCIN presents specific compatibility challenges. This document details the software’s purpose, hardware requirements, step-by-step downloading/uploading procedures, and configuration parameters required for successful machine data backup and part program management.

5.1. Procedure: Backing Up Data (CNC $\to$ PC)

Scenario: Saving machine parameters or a part program to the computer.

1. Prepare PC: Launch PCIN. Go to V.24 Parameters and verify settings. Press F3 (Load).
2. Name File: PCIN will prompt for a filename (e.g., MACHINE_BACKUP.ARC). Enter the name and press Enter. PCIN will now wait for data.
3. Prepare CNC: On the Siemens control, navigate to the "Services" or "Data In/Out" area.
4. Select Data: Choose the data type to transfer (e.g., "Machine Data," "Part Program").
5. Initiate Transfer: Press the "Start" or "Output" soft key on the CNC control.
6. Completion: The PC screen will display scrolling text characters. Once the scrolling stops, press ESC on the PC to close the file. The backup is complete.

How to Use PCIN (Quick Start)

3.2. Hardware Interface

• Ports: A standard RS-232 Serial Port (9-pin or 25-pin) is required. Modern laptops lack these ports; therefore, a high-quality USB-to-Serial Converter is necessary.
• Cabling: A Siemens-specific communication cable is required. This is typically a "null modem" cable with specific handshaking pins bridged (often 5 to 6 and 4 to 8 internally within the connector).
  • Common Pinout (9-pin PC to 9-pin CNC): PC Pin 2 ↔ CNC Pin 2; PC Pin 3 ↔ CNC Pin 3; PC Pin 5 ↔ CNC Pin 5. (Handshaking lines may vary based on machine parameter settings).

1. Introduction

Siemens offers various software packages for industrial PCs (IPCs), including:

• SIMATIC WinCC (SCADA)
• SIMATIC WinCC OA (open architecture)
• SIMATIC STEP 7 (PLC programming in TIA Portal)
• SINUMERIK CNC software
• SIMATIC IPC DiagMonitor (diagnostics)

No single “PC IN software” exists – the correct package depends on your application (HMI, PLC, edge computing, etc.).

Issue 3: DOS Screen Freezes in Windows

• Cause: Modern Windows (NT kernel) restricts direct hardware access.
• Resolution: Run PCIN inside DOSBox. Configure the DOSBox .conf file to map serial1=directserial realport:COMx (where x is your actual port number).