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UF3300 Modbus
changes" setting to Yes in the Modbus settings menu. Blocking all
updates by the MBM is accomplished by setting "Block all remote
changes" to "Yes". The status of these settings is reflected in register 8
(offset 7) bit 2 and register 7 (offset 6) bit 1 respectively (see the Map).
13.5
General Procedure for Updating Unit Settings
Other than the Modbus measurement regime, all registers that result in
settings or values in the local unit being updated, have flags associated
with them. Values can be written into these registers, but no action will
be taken until the associated flag is activated.
There are three key flags that must be considered when updating these
registers.
The first and most important is the Lock-out Updates (bit 0) in the
Instrument Control flags register number 6 (address 5). This bit ensures
that registers will not be updated by the device until the flag is reset.
The purpose is to ensure that the values being updated are not
overwritten with updated values from the unit. For example, imagine
resetting a total only to have its value overwritten by an update from the
unit before it can be set in the unit. More examples will follow, but in
general it is good practice to set this flag before writing and reset it after
the operation is complete. It is important to remember that values will
not be updated until this bit is reset.
The other two bits that are important are the Remote Total Changes
Disabled flag (bit 2) of the Instrument Status flags register 8 (address
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