### Master Troubleshooting Process: SCO UnixWare/SVR4 (Some Devices Fail)

Use this troubleshooting process if one or several devices function incorrectly or not at all. This process focuses on your operating system, which is where the problem probably might be.

Process

Step 1. Test the port connection from the operating system. Go to Testing the port connection.

> Do the DTR and RTS indicator lights on the PortServer flash briefly and do you get data results and port status information on your terminal screen?

> Your connection was successful. Your devices should work. If the device doesn't work, call Digi Technical Support. | Make note of the results and continue to the next step.

Step 2. Check the LED indicators on the PortServer. Is OFC on?

> Go to Checking the LED Indicators: OFC On? | If OFC is not on, continue to the next step.

Step 3. Telnet directly to the port. Go to Performing a Telnet to the Port.

> When you entered the command on the keyboard, did the word "Connected" appear on the screen?

> Also, anything you entered should appear on the attached terminal and anything entered on the dumb terminal should appear on your telnet screen. This verifies that the port is functional, along with the attached cable and terminal while bypassing RealPort. Disconnect from the telnet session. Go to Disconnecting Telnet. | If the host cannot telnet to the port, then RealPort won't connect to it. Check the previous set commands on the PortServer and try the command again. If you still do not get any results, call Digi Technical Support.

Step 4. Test the connection from each terminal. Go to Testing the Terminal Connection.

> Does the date appear on the terminal?

> The device is properly connected. Continue with the next step. | If nothing appears on the terminal, the device is not receiving data. Go to Testing the Terminal Connection: No Data. If scrambled characters appear on the screen, the device is receiving data but there is still something wrong. Go to Testing the Terminal Connection: Scrambled Data.

Step 5. Verify that RealPort is running on the SCO UnixWare/SVR4 operating system by entering:

> > `ps -ef|grep ncx`

> Do the IP numbers match those of the PortServer?

> Your devices should now be working properly. If they still do not work correctly, call Digi Technical support. | Do the following: Modify the /etc/rc2.d/S26realport file with the appropriate IP numbers. Reboot the UNIX server. Your devices should now be in an available state and working properly. If they are not, go to Step 6.

Step 6. Force a Carrier Detect on the port by entering one of the following commands:

> > `ditty forcedcd /dev/dty/x###s`

> Do your devices work correctly now?

> Place the following command in the /etc/rc2.d directory to make the setting permanent: Note: A common file name is $99digi. `cat< dev/dty/x###s` `./dev/null &` `ditty forcedcd /dev/dty/x###s` You have completed the Master Troubleshooting Process. | Call Digi Technical Support.