The Heidenhain TNC 150 control remains a reliable industry standard for precision machining. To ensure seamless DNC data transmission, correct RS232 serial interface configuration is critical. Precise alignment of machine parameters (MP92 and MP71) and handshake protocols—such as RTS/CTS or Xon/Xoff—with your DNC communication software is essential to prevent data transfer errors and optimize your CNC workflow.
| Parameter | Value | Comments |
|---|---|---|
| MP92 | 1 | Select Multi Func. |
| MP71 | 3 | - |
| BaudRate | 2400 | (Match with DNC software settings) |
Select RTS/CTS flow control within your DNC software. Ensure your DNC software is configured to insert STX and ETX control codes into the data stream. In easyDnc 4.0, this is configured via the DNC Setup window; navigate to "Advanced" and select these options from the available dropdown menus.
ASCII Start Code = STX (02)
ASCII End Code = ETX (03)
The cable diagram shown below supports both xOn/xOff (DC1/DC3) and RTS/CTS (Hardware flow control), ensuring compatibility with most installation environments.
If you have verified that your CNC does not require hardware flow control—or strictly utilizes xOn/xOff—you may opt for a simplified 3-wire cable configuration. View the diagram here.
RS232 Cable: 9-pin computer to 25-pin CNC
