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Reference Manual
00809-0200-4410, Rev BC
Host Integration
July 2017
Host Integration
Figure 5-5. Modbus Register Map Page
To add a new data point to the Modbus register map:
1. Select New entry.
2. Complete all of the table entries for the new data point (note that the entry columns may vary based
on the Modbus communications settings).
3. Repeat for each new data point.
4. Select Submit.
5. When changes have been accepted, select Return to form.
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 registers. Each data
point needs a unique Modbus register number, unless they are assigned different addresses. Register
numbers 0–19999 are reserved for Boolean (bit, coil, binary, etc…) values. Register numbers 20000+ are
reserved for floating point or integer values.
Point Name: This is a two part name for the data point. The first part is the HART Tag of the wireless field
device which is producing the data. The second part is the parameter of the wireless field device.
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