<Digital I/O> Test Screen
zConnect CN1 to CN2
z16 bit up counter is sent to 16 channel DO
z16 channel DO is connected to 16 channel DI
z16 channel DI are readback and show on the screen
zIf DO equals DI then OK shown on screen
zIf DO does not equal DI then Error shown on screen
zPress <p> pause screen, press <p> again release screen
zPress <Up> key to increase the screen delay
zPress <Down > key to decrease the screen delay
zPress <ESC> key to quit