5 Service and maintenance
46 | 266 MODBUS® multivariable transmitter User manual 2105216 Rev. AB
Transmitter write protection
Enable write protection
Use the following procedure to enable the software security write protection mode.
1. Disconnect the power supply to the transmitter.
WARNING – Bodily injury. When the housing covers are removed and power is still connected, there is a
potential for explosion. Failure to observe this safety information may result in death or severe injury.
Do not remove housing covers in hazardous (classified) areas or explosive environments unless the area is
known to be non-hazardous. Verify an explosive atmosphere is not present before removing the housing covers
when the power is live.
This procedure does not require the transmitter to be powered up.
2. Remove the front housing cover following the instructions in section 5.2.1, Removing the housing cover.
3. Remove the LCD assembly following the instructions in step 3, section 5.4, Replacing the LCD assembly.
4. Locate DIP switch 5 on the electronics module (Figure 36). Switches are numbered from left to right, so switch 5 is the next
to the last switch on the right.
Figure 36: DIP switches on the electronics module
5. Using a small slotted screwdriver, flip switch 5 up to the ON position. The device is now write protected.
6. Replace the LCD assembly and housing cover (go to sections 5.4, Replacing the LCD assembly, and 5.2.2, Securing the
housing cover).
7. Restore power to the transmitter.
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