Cannot open serial port COM1 in a I/A Series (Niagara) G3 system ENC when attempting to use Serial Tunneling.

[Product_Support]

Issue

When attempting to use Serial Tunneling through an I/A Series (Niagara) G3 system ENC, the following error message is displayed in the Application Director window:

ERROR [....][Serial Helper] Denied Opening comm port 'COM1'
javax.baja.serial.PortDeniedException: COM1 is already owned by dbgjmpr

Environment

I/A Series (Niagara) G3 ENC-520, ENC-410.

Cause

This error is reported when the operating system console enable jumper is installed on the front two pins of the MODE connector in the upper right corner of the ENC circuit board. 

NOTE: This jumper is installed only when using a serial terminal running at 57600 baud and connected to serial port COM1 to troubleshoot ENC operating system startup / IP address issues.

Resolution

Remove the jumper and reboot the ENC.