Emerson Rosemount 5900S Reference Manual page 196

Service and troubleshooting
September 2019
6.2.6 Write protection using TankMaster
A Rosemount 5900S can be software write protected to avoid unintentional configuration
changes. Software write protection locks the holding register database.
Procedure
1. Start the Rosemount TankMaster WinSetup program.
2. In the TankMaster WinSetup workspace, select the Logical View tab.
3. Right-click the device icon.
4. Select Write Protect.
5. In the New State drop-down list, select Protected, and then click the Apply button
6. Click the OK button to close the Write Protect window.
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to save the new write protect state.
Now the holding register database is locked. As long as the device is write protected
no configuration changes can be made.
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Reference Manual