Extron Electronics VN-COMMANDER - Manual (Page 73)

I456GB issue 8 63
VN-COMMANDER User Guide Section 2: System Configuration
Use the Timer source type to create an on-screen clock or
count-down/up timer.
IMPORTANT NOTE: Do not mix Timer/Clock source windows
with the Target Display Clock function (see page 34) as
unpredictable results may occur. Use one method or the other
to show a clock on the target display
Timer