IQDMX01/03/11/13
B5
IQDMX01OPS 05/04/07
www.snellwilcox.com
Version 1 Issue 12
B5.31
GPI (continued)
Output Functions
The GPO may be configured to produce an output
corresponding to one of the following conditions:
•
Input Present
•
Standard 625
•
Video Delay
•
Unused
The preset setting for the output is to Unused.
When the condition is not true the output will float
but when the condition is true the output is closed
to ground via a transistor.
Note that when video delay mode is selected the
output is a negative going TTL pulse. The width of
the pulse will be 1 millisecond.
GPI Out Status
This will display the current status of the GPI
output. This may show either Unused, High, low or
video delay in milliseconds.
Timer Enable
When checked the GPI will be monitored. The
width of the pulse represents the delay that can be
used to control audio delays in this unit.
Note that an audio delay pulse of more than
500 ms, applied to the GPI Input will be treated as
invalid. This will result in the GPI delay returning to
zero.
Timer Active High
When checked the GPI will measure the positive
going pulse. When unchecked the negative pulse
is measured.
Out Active High
This determines the sense of the asserted GPI
output signal. When checked the GPI is active the
output sense is high. When unchecked the GPI is
active low.
GPI I/O Output Enable
When checked the GPI is configured as an output.
When unchecked the GPI is configured as input.
