12.2.Configuring the Cascade DataHub on QNX

You can configure the Cascade DataHub on QNX from the command line when you start the DataHub using the datahub command. A complete list of the datahub command options is available in the Cascade DataHub for Linux and QNX manual. Here we will explain only the necessary ones.

Configure the Cascade DataHub as mirroring slave

If the OPC DataHub on the Windows machine has been configured as a tunnelling master, the Cascade DataHub on the QNX machine must be configured as a mirroring slave.

  1. Start the DataHub using this command-line syntax:
    [sh]$ datahub -M address -m port -n domain
    where:
    address

    The name or IP address of the Windows computer.

    port

    The TCP port number used by the DataHub for mirroring. The DataHub's preconfigured default is 4600.

    domain

    The name of the data domain on the OPC DataHub where the OPC data is coming from.

    Once you enter this command, the Cascade DataHub will start on the QNX machine and attempt to connect to the OPC DataHub on the Windows machine.
  2. To see the data, start phdhview like this:
    [sh]$ phdhview -d domain &
    where domain is the same as you entered for the DataHub. When you enter this command, the X Windows version of a DataHub viewer should open, allowing you to see the incoming OPC data.

Configure the Cascade DataHub as mirroring master

If the OPC DataHub on the Windows machine has been configured as a tunnelling slave, the Cascade DataHub on the QNX machine must be configured as a mirroring master.

  1. Start the DataHub like this:
    [sh]$ datahub -d domain -p 4600
    where domain is the same name you entered on the Windows machine as the Remote data domain.
    Once you enter this command, the Cascade DataHub will start on the QNX machine and should accept any attempt by the OPC DataHub on the Windows machine to make a connection.
  2. To see the data, start phdhview like this:
    [sh]$ phdhview -d domain &
    where domain is the same as you entered for the DataHub. When you enter this command, the X Windows version of a DataHub viewer should open, allowing you to see the incoming OPC data.

Please refer to the Cascade DataHub for Linux and QNX manual for more information about using the Cascade DataHub in QNX.