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specified defining the range of values to be reported. In addition, scaling
must be chosen (i.e. 0 to 9999, -32000 to 32000, 0 to 65000, etc.).
2.2.2.5.4 Option 4, Configuration (Modbus Configuration)
Choosing option 4 on the Edit Modbus Parameters menu brings up the
"Modbus Configuration" submenu with the following options.
2.2.2.5.4.1 Option 1, Configure Links
This option allows the user to configure the host links either for
Modbus communication or for use with the Hand Held PC and PC-
based User Interface Unit.
2.2.2.5.4.2 Option 2, Compatibility Choice
This option is included for customers that previously had a M6280
system and are now upgrading to a M6290 system. It allows the user
to program Modbus operation for better compatibility with the older
M6280 Modbus specification. (Some changes are still necessary.)
This option should only be used if the DCS software cannot be
changed to match the new 6290 specification, since there are a
number of advantages in using the new 6290 specification.
2.2.2.6 Option 6, Simulator
Choosing option 6 on the Edit Parameters menu brings up the "Simulator
Functions" submenu. This menu allows access to all the simulator functions.
The simulator functions of the M6290 are useful for software testing when
connecting the system to a host computer. The user may enter artificial
values to exercise the full range of possible values that could be reported to
the host computer. The user can also set individual status flags one at a time
to verify that they are being properly reported.
One of the possible uses of the simulator is to run a profile and enter artificial
values that will generate a certain type of profile. The resulting profile may be
stored and recalled using the profile store and recall functions described
below. In order to facilitate this activity, the values for temperature and
density may be entered separately from the values of position and level.
It is important to realize that any information reported by the system while in
the simulator mode is not indicative of the actual conditions in the tank.
2.2.2.6.1 Option 1, Position & Level
When this option is selected, the user will be prompted to enter values for
position and liquid level. Note that if the system is in Auto with the lower
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