Security

The security parameters are set during controller set up. Two independent security features are provided. First, a password scheme implements three security levels by using three separate passwords. Second, the controller may be instructed only to respond to requests from the LAN. This disallows any request received from the Internet, while allowing access to the PCs on the LAN (see Controller Setup).

These passwords control the type of access to the controller. A “read password” is used to screen other nodes when they want to read (view) the data related to the controller and its modules. A “write password” is used to screen other nodes when they want to write to the controller or its modules (modify the outputs). Finally, a “log/program password) is used to screen other nodes when they want to change the logging scheme or change automated tasks performed by the controller.