Enable/Disable Hart Security - Emerson Micro Motion 9739 MVD Configuration And Use Manual

3.10

Enable/disable HART security

You use the HART security switch located on the transmitter display to disable configuration of the
transmitter using HART protocol. When the HART security switch is set to ON, HART protocol cannot be
used to perform any action that requires writing to the transmitter. For example, you cannot change
the configuration, reset totalizers, perform calibration, etc., using the Field Communicator or ProLink II
with a HART/Bell 202 or HART/RS-485 connection. When the HART security switch is set to OFF, no
functions are disabled.
Important
The HART security switch does not affect Modbus communications.
If the transmitter is in a hazardous area, do not remove the housing cover while power
is being supplied to the unit. Removing the housing cover while power is supplied to
the unit could cause an explosion. To access the HART security switch in a hazardous
environment, be sure to remove power from the transmitter before removing the housing
cover and setting the HART security switch.
Procedure
1. Remove power from the transmitter.
2. Remove the transmitter housing cover.
3. Move the HART security switch to the desired position (see Figure 3-10).
Figure 3-10 HART security switch (on blank display)
A
HART security switch
B
Unused
4. Replace the transmitter housing cover.
5. Restore power to the transmitter.
Configuration and Use Manual
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B
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