Nematron Pointe Controller - Manual (Page 226)

Chapter 8: Networked Operations Pointe Controller User Guide
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4. Double-click on an address you want to map. A pop-up window appears
listing all of the currently defined Logic Memory variables that can be
mapped to that Modbus data type.
For more information on which Logic Memory variables can be mapped to
which Modbus data types, see “
Types of Modbus data ” on page 219 .
5. Select the variable you want to map from the pop-up window. The
variable is mapped to the address.
NOTE: Each Modbus address represents a 16-bit memory location. If the
selected variable — for example, a string or a long interger — requires
more than 16 bits, then additional addresses will be allocated to the
variable and marked as <unavailable>.
Also, PointeControl will automatically append a NULL terminator onto a
string as it is mapped. Therefore, as an example, a 20-character string will
be allocated 11 addresses: 10 addresses for the string at two characters
per address, plus one address for the NULL terminator.
6. Continue mapping each address until finished.
NOTE: You do not need to map all of the addresses in a data type. You
can leave some blank while mapping only the addresses needed to
communicate with your other Modbus devices.