46 • Camera Performance and Features Linea Lite GigE Series Camera
The camera can accommodate triggers up to its specified maximum frequency. If the maximum
frequency is exceeded, the camera will continue to output image data at the maximum specified.
The result will be that some trigger pulses will be missed and there will be an associated distortion
(compression in the scan direction) of the image data. When the line rate returns to or below the
maximum specified, then normal imaging will be reestablished.
The Linea Lite supports single or dual phase (also known as quadrature) rotary encoder. Dual
encoder signals are typically 90 degrees out of phase relative to each other (phase A and phase B)
and provide greater web motion resolution. The Line Lite rotary encoder inputs provide additional
functionality with encoder rescaler (multiplier and divider) support to adjust the encoder output
timing.
Dual Balanced Shaft Encoder:
• Input Phase A: Phase A + and Phase A – can be assigned to Line 1 or Line 3 using the
Rotary
Encoder Input A Source feature.
• Input Phase B: Phase B + and Phase B – can be assigned to Line 2 or GND (not used) using the
Rotary Encoder Input B Source
feature.
• See HD15 Connector Details for complete connector signal details)
When enabled using the Trigger Mode feature, the triggered camera acquires one scan line
according to the how the various rotary encoder feature settings:
Rotary Encoder Source Activation: Sets whether encoder ticks (triggers) are considered valid on a
rising or any edge.
Rotary Encoder Output Mode: Sets whether encoder ticks are valid for any motion (forward or
backward) or only in a specific direction (clockwise or counter-clockwise.
Rotary Encoder Rescaler Order:The rotary encoder pulses can also be controlled using a divider and
multiplier, in either order, as specified using this feature. The divider (0-255) determines how
many pulses are received before issuing the line start trigger; the multiplier (2
n
up to 128)
increases the number of line output pulses generated for each trigger received. The rescaling factor
is the same regardless of the order. The order may be a factor when the incoming encoder trigger
is very slow or fast. To avoid reaching the input trigger frequency limits or excessive jitter, very
slow triggers should apply the multiplier first; very fast incoming triggers should apply the divider
first.
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