The Heidenhain blockwise protocol is the essential communication standard for reliable DNC (Direct Numerical Control) drip-feeding on legacy Heidenhain CNC controls, including the TNC 360, 425, and 2500 series. By configuring machine parameter 5030, you can effectively bypass internal memory limitations, allowing for the seamless streaming of complex, high-volume machining programs. Optimizing your serial communication settings and hardware handshaking is vital to maintaining operational uptime and preventing data transmission interruptions during critical production cycles.
| Parameter | Value | Comments |
|---|---|---|
| Baud rate | - | Supports 110-38400. 19200 is recommended for DNC/Drip-Feeding. |
| 5030 | 0 | 0 = Blockwise transmission disabled. |
| 5030 | 1 | 1 = Blockwise transmission enabled (Heidenhain protocol). |
Cabling and Setup Notes
RS232 Cable: 9-Pin PC to 25-Pin CNC
Setup Instructions:
In your DNC software (e.g., RemoDNC), set the communication mode to "Heidenhain" and the flow control to "Blockwise." Initially, disable "Wait" and "Retry" functions until the baseline communication is verified and stable.