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Wait for the message to clear automatically - this typically takes 2-10 seconds depending on buffer size and transmission state.

Do not power cycle or force-reset the control while this message is displayed - allow proper communication closure.

Forcing a reset during this phase may corrupt the serial interface buffer or require V.24 interface reinitialization.

Once message clears, verify RS232C cable is properly seated if you need to restart the transfer immediately.

If resuming DNC operation, reinitiate the transfer from the beginning - partial transfers cannot be resumed on 840D systems.

Check HMI Setting Data → V.24 interface settings for baud rate and handshaking configuration - lower baud rates increase clearing time.

If message persists beyond 30 seconds, check external device (PC/DNC computer) has also stopped transmission - both sides must halt.

Review machine data MD11210 (serial interface buffer size) - oversized buffers can cause extended wait times during stop operations.

Do not modify MD11210 without documenting original value - incorrect buffer size can cause communication failures.

If routine transfers experience long stop delays, consider increasing baud rate in V.24 settings (both control and external device must match).

If message persists beyond 60 seconds, inspect RS232C cable for bent pins, particularly pins 4 (RTS), 5 (CTS), 6 (DSR), and 20 (DTR).

Verify handshaking mode in HMI → V.24 settings matches external device configuration (hardware vs software handshaking).

If problem persists, perform controlled NCK reset: Select 'Reset' from HMI after the message finally clears, then retest RS232C connection with short test file.

Ensure no active machining operations before NCK reset.

As last resort, power cycle both the SINUMERIK control and external communication device, then reconfigure V.24 interface parameters from known-good settings.

Document all current V.24 settings before power cycle - write down all parameters from the interface configuration screen.