BB2-7030 User Guide – Rev. 1.0
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the results of all qualifying rules will be OR-ed together before being sent to the remote
destination.
For the remote register to be written, enter the register type, format, number, and location
(device). The names in the device list are defined in the Devices page.
The repeat time may determine how often the remote register will be written. If send on delta and
maximum quiet time are not checked above, clicking the "at least" button will establish a
periodic update time. If send on delta is used and you wish to limit the network traffic in the
event changes are frequent, click the "no more than" button and enter the minumum time that
should elapse before another write to the remote device.
Delete will remove the rule number shown in the "Map #" box. Insert will insert a new rule
before the rule number shown, and is used for placing rules between existing rules. It is not
necessary to use Insert to add rules to the bottom of the list or to define any rule presently having
zero for a source register or "none" for remote type.
Selecting "none" for remote type effectively deletes the rule even though it will still appear in the
list until deleted. Unused rules at the end of the list will always show none as the type. If you
wish to prevent these from being displayed, reduce the number of rules enabled.
Initial COV increment and period will only apply if a BACnet client subscribes to COV
notification from the BACnet object assigned to this Modbus map. These properties may be
overwritten by the BACnet client(s) at any time. The values shown here are initial values, not
necessarily the current values. (Note: COV increment only applies to Analog objects, all changes
are reported for Binary or Multistate objects.)
Units default to no_units, but you may select any of the available BACnetEngineeringUnits
values. This value will simply be read by the BACnet client when the units property is requested
from the object this Modbus register maps to. The units have no bearing on calculations
performed. You must select appropriate scale and offset values to make any required translation
between Modbus units and BACnet units. Units are only valid for Analog objects.
Initial Relinquish Default may be set here, but may be overwritten by the BACnet client at any
time. This window reflects the initial value, not the current value. (Note: Relinquish Default only
applies to commandable Output objects, and does not apply to Input or Value objects.)
The number of rules enabled simply limits the scope of rule review so that you do not have to
review a lot of unused rules. If the displayed rules are used up and you need more, increase the
enabled number.
