Modbus Daniels - How is data stored in Enron Modbus?

How is data stored in Enron Modbus?

In Enron Modbus, there is a different table for each of the different data types.

Information is stored in the Slave device in four different tables.
One tables stores on/off discrete values (boolean variables) and three tables store numerical values.

Each value in a table has a data address and a corresponding register number.

Data Addresses (hexadecimal)	Register Numbers (decimal)	Type	Table Name
03E9 to 07CF	1001-1999	Read-Write	Boolean variables
0BB9 to 0F9F	3001-3999	Read-Write	16 bit Short integer variables
1389 to 176F	5001-5999	Read-Write	32 bit Long integer variables
1B59 to 1F3F	7001-7999	Read-Write	32 bit Floating point variables

Unlike Standard Modbus, in Enron Modbus the Register Numbers are equal to the Data Addresses. For example, Register Number 7001 has Data Address 1B59(7001 in hexadecimal). The offset is 0 for all Enron Modbus Registers.