The status bar, on the bottom of your screen, always displays the communication status with an icon on the right hand side. When no TCU is connected or there is a communication error, the display will appear as follows with a white X inside a red circle:
The left hand side of the status bar will display the word 'Idle' in this mode. When the TCU is connected and in the On-Line mode, the display will appear as follows with two red or green dots in the icon:
While On-Line, the two dots in the icon will toggle between green & red indicating send receive status of the active RS-232 port on the PC.
Off-Line mode is indicated by a tan folder icon:
