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Reference Manual
00809-0100-4052, Rev AA
3.4.2
Register mapping
Register mapping is the process of assigning data points from wireless field devices to Modbus
registers. These registers can then be read by a Modbus master or client. Modbus register
mapping can be found by navigating to System Settings>Protocols>Modbus.
Figure 3-3. Modbus Register Map Page
To add a new data point to the Modbus register map:
1.
2.
3.
4.
5.
Address: This is the Modbus RTU address used by the Gateway for this data point. It is possible
to group data points assigning them the same address (i.e. all data points from the same
process unit can have the same address). This column only appears if Multiple Modbus
Addresses is selected on the Modbus Communications page.
Register: This is the Modbus register number used for this data value. Modbus registers hold
two bytes (16 bits) of information; therefore 32 bit floats and integers require two Modbus
Host Integration
Click Add New Entry.
Complete all of the table entries for the new data point (note that the entry columns
may vary based on the Modbus communications settings).
Repeat for each new data point.
Click Submit.
When changes have been accepted, click Return to form.
Section 3: Host Integration
April 2015
17
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