Modbus Enron RTU Configuration

General Information

General information about RTU Configuration can be found here. It discuss file locations and configuration interface topics common to any device using RTU Configurations.

Sample Configuration

Below is a sample configuration file. Please note that this is only a starting point. The file may have as many or as few table & row tabs as are necessary.

<Tables>
 <Table Number="0" Description="First two analogs" Selected="True" LastRead="2009/03/19 16:49:14">
   <Display Key="Register" F1="Value" ID1="ExternalID1" Lnk="ItemLink"/>
    <Data>
     <row Key="7001" F1="0" ID1="DiffPress" Lnk="DP_0001"/>
     <row Key="7002" F1="31909" ID1="Temperature" Lnk="SP_0001"/>
     <row Key="7202" F1="0" ID1="New" Lnk="SP_0001"/>
    </Data>
</Table>
<Table Number="1" Description="Next two analogs" Selected="True" LastRead="2009/03/19 16:49:14">
 <Display Key="Register" F1="Value" ID1="ExternalID1" Lnk="ItemLink"/>
  <Data>
   <row Key="1161" F1="0" ID1="Control Output 1" Lnk="SP_0001"/>
  </Data>
 </Table>
</Tables>

Table Tag

In the above sample file, notice that individual configuration items are grouped into tables. This is simply a logical grouping for the sake of readability. The user may add as many or as few tables as desired.

The Table tag has several attributes:

• Number – An identifier for the table. This can be of the user’s choosing, but must be unique.
• Description – An optional description for human readers.
• Selected – Can be “True” or “False”. If the value is “True” the data in that section will be used when writing to the device. Otherwise, it will be ignored. 
• Last Read - An attribute that will be updated with the current date and time whenever the configuration data is read from the device and stored in the file. This attribute may be left blank when creating the initial file.

Display Tag

Within each table tag, there must be at least a Display tag. The Display tag must have a Key & F1 attributes.

• Key - The Modbus register address to be read. 
• F1 - The value read from the associated Modbus register (Key). 
• ID1 - An optional identifier to give the Modbus register (Key) a descriptive name. 
• ExternalID1 - An optional identifier to link the Modbus register with an external system. 
• Lnk - A second optional identifier to link the Modbus register with an external system.

Data Tag

The Data tag is a container for individual Row tags which define each configuration setting.

Row Tag

The Row tag defines a single configuration setting.

• Key – the Modbus register address for a configuration point. 
• F1 – contains the data for the configuration point. 
• ID1 – Optional data to help identify the configuration point. 
• Lnk – Optional data to help identify or link the configuration point with an external system.