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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.
6.4 Modbus TCP Errors
6. Configuring BB2-7010 as a Modbus TCP Client
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