BNC 725 - Manual (Page 54)

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When a channel is in Fixed Output, Clock Pulse, Output=Input or Toggled timing modes,
the green light indicates that the output is currently LOW for that channel.
2. A red light typically indicates that the channel is in the process of triggering.
When a channel is in Fixed Output, Clock Pulse, Output=Input or Toggled timing modes,
the red light indicates that the output is currently HIGH for that channel.
3. When a channel indicator is steadily off, the channel is disabled (see Enable/Disable
Channels below). The channel indicator also turns off during delays and while waiting
for the input to return low for an edge trigger.
The following chart provides an overview of the front panel channel LEDs:
Mode Off Green Red
Fixed Output -- Output is Low Output is High
Output = Input
(Passive) -- Output is Low Output is High
Clocked Pulse
Stream -- Output is Low Output is High
Delayed Pulse After
Trigger In delay period Waiting for trigger; if
retriggering is on,
light will glow green
once input goes low In duration period; if
retriggering is off,
light remains red after
duration period
Validate Trigger
(Noise Suppression) -- Waiting for trigger; if
retriggering is on,
light will glow green
once input goes low In duration period; if
retriggering is off,
light remains red after
duration period
Counter Count data is being
reported, waiting for
input to go low Waiting for first
trigger pulse Waiting for second
trigger pulse
Dynamic Delayed
Pulse -- Waiting for trigger; if
retriggering is on,
light will glow green
once input goes low In duration period; if
retriggering is off,
light remains red after
duration period
Toggle -- Output is Low Output is High