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92 • Technical Specifications X64 Xcelera-CL PX4 User's Manual

Note 4: Shaft Encoder Input Specifications

Dual Quadrature Shaft Encoder Inputs (phase A and phase B) are opto-coupled and able to connect to

differential signals (LVDS or RS422) or single ended TTL source signals. The following figure is typical

for each input.

V+

SE +

220

nSE

SE -

noise filter

• For single ended TTL signals, the SE- pin is connected to ground. The switch point is ~2V.

• Each input has a ferrite bead plus a 220 ohm series resistor on the opto-coupler anode.

• Maximum input signal frequency is 200 KHz.

• See "Line Trigger Source Selection for Linescan Applications" on page 45 for more information.

• Refer to Sapera parameters:

CORACQ_PRM_SHAFT_ENCODER_ENABLE CORACQ_PRM_SHAFT_ENCODER_DROP

or refer to CORACQ_PRM_EXT_LINE_TRIGGER_ENABLE

CORACQ_PRM_EXT_LINE_TRIGGER_DETECTION

CORACQ_PRM_EXT_LINE_TRIGGER_LEVEL (fixed at LVDS)

CORACQ_PRM_EXT_LINE_TRIGGER_SOURCE

• See also *.cvi file entries:

Shaft Encoder Enable, Shaft Encoder Pulse Drop

or see External Line Trigger Enable, External Line Trigger Detection, External Line Trigger Level,

External Line Trigger Source.

Dalsa X64 Xcelera-CL PX4 User Manual

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