The UltraSync ONE has an option within the menu of the device to select Continuous or Run/Stop timecode. To enable this feature, please ensure your units are updated to firmware version 3.08 or higher.
To learn more about Run/Stop timecode visit our FAQ here: https://support.timecodesystems.com/hc/en-us/articles/6283183462685-What-is-the-Run-Stop-timecode-option-on-the-UltraSync-ONE-