CABLING NOTE: This configuration requires a straight through EIA-232 serial cable from the Digi device to the Bristol Babcock RTU Slave.  If you are using the Digi supplied cable, a null modem adapter is required to make the cable straight through.

Configure Digi Device for ModbusTCP using the Digi One IA RealPort :
1.   After installing Digi Port Authority Remote, you can run it by going to Start, Programs, Digi, Digi Port Authority - Remote and select
      Digi Port Authority - Remote (see Figure 1).    
     
 
2.   Click on Discover to find your Digi One IA RealPort.  If you are on a DHCP network, you will automatically obtain an IP Address.  
      If not, you can assign an IP Address by clicking on Configure to assign and IP.  
    

3.   Once an IP Address is assigned, click on Configure to launch the web browser and finish the Digi One IA RealPort configuration.
    

4.   Log into the Digi One IA RealPort by entering the default username: root and password: dbps.
    

5.   Once the browser is launched (notice your Digi One IA RealPort IP Address in the address field of your internet browser), you can
      finish the Digi One IA RealPort configuration.  After logging in select Setup Wizards.
6.   Choose Industrial Protocols.
   

7.   Click Next.
    

8.   In the next window you will want to configure your port settings.  When you are finished, click Next.
     

9.   When prompted to choose the industrial automation protocol for this port, select Modbus RTU from the drop down box.
      When you are finished, click Next.
  

10.  When prompted to configure a protocol master or a protocol slave, select the radio button next to Slave. 
       When you are finished, click Next.
     

11.  You will get a summary screen of your selections.  If everything looks correct, click Finish.
     

Configure the Automated Solutions Application:
1.  Run the ModbusTCP OPC Server.
2.  Add a Channel.
3.  Enter the IP Address of the Digi One IA RealPort and click OK.
4.  Next, you will need to add a Device.
5.  Select the Channel you just created and enter the Device ID of the RTU.
6.  From the Address Type drop down box, select Absolute Zero-Based.
7.  Check the box next to Float Word Swap to enable it.
    
8.  When finished, click OK.
9.  To continue add a Group next.
10.Finally, add a Tag.  Select the register type and register location to be read from and click OK.
11.Click on Monitor Mode to verify communication has been established.