An Omron NT31C-ST141B-EV2 enters its setup page, but selecting Transmit Mode only illuminates the button briefly before it returns to OFF. The transmission page therefore does not open, preventing an upload to the PC. The available evidence does not establish whether a transfer lock exists or identify a confirmed root cause.
Confirmed Fault Boundary
| Item | Observed result | Engineering implication |
|---|---|---|
| Panel | NT31C-ST141B-EV2 | The fault is associated with this specific unit. |
| Setup access | Setup opens after touching the two panel points. | Touch input and setup entry operate at least far enough to reach the command. |
| Transmit Mode | Button illuminates briefly, then returns to OFF. | The panel does not remain in transmission mode. |
| Cable and PC | The same equipment completed the operation with an identical panel. | The cable and PC are comparison-tested, although this does not prove their condition under every connection. |
Transmission-Lock Question
No supplied evidence confirms a program-transfer lock, identifies an unlock setting, or provides a supported bypass procedure. Do not change undocumented settings on the assumption that the brief button response proves a lock; the same symptom could also indicate a unit-specific configuration or panel fault.
Diagnostic Procedure
- Repeat setup entry and select Transmit Mode. Record whether the button always returns immediately to OFF and whether any message appears.
- Reconnect the same cable and PC arrangement that worked with the identical panel, preserving the known-good setup. Confirm that the connector is fully seated at the affected unit.
- Compare the affected panel's visible setup options with the identical working panel. Record differences without altering unknown settings.
- If the working panel remains able to enter transmission mode while the affected panel cannot, isolate the investigation to panel-specific configuration or hardware and consult Omron documentation or an official support channel for the exact model.
Verification Criteria
The issue is resolved only when Transmit Mode remains active, the transmission page opens, and the PC can begin the upload. A momentary button highlight is only touch-command feedback; it does not verify that transfer mode was accepted.
FAQ
Why does NT31C-ST141B-EV2 Transmit Mode turn off immediately?
The evidence confirms the momentary illumination and return to OFF but does not establish the cause. Compare the affected unit with the identical working panel to separate panel-specific configuration or hardware from the already comparison-tested PC and cable.
Can program transmission be locked on an Omron NT31C-ST141B-EV2?
The supplied information does not confirm a transmission-lock feature or an unlock procedure. Verify the exact model documentation through Omron before changing setup options.
How do I verify that the NT31C-ST141B-EV2 is in transmission mode?
The button must remain active and the transmission page must open. A brief highlight followed by OFF means the panel has not entered the required mode.