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Modular LYNX System
Modular LYNX System 12.05.2003
The Differential I/O
The Clock Interface
The LYNX has four clock pairs that are used by the high speed I/O. One of these, clock
pair 11 and 12, is fixed as an output and is used internally to provide step clock and
direction pulses to Step Clock and Direction outputs located on Connector P1 of the
LYNX Controller. The step clock output increments CTR1 (Counter 1). CTR1 may be
read from or written to by software instructions in either program or immediate mode.
The following table explains the clocks, as well as their default I/O line pair placement.
Clock Types Defined
There are three basic types of clocks that may be configured for the LYNX, they are:
1] Quadrature
2] Step/Direction
3] Up/Down
These clock functions are illustrated in figure 6.4.
Quadrature
The quadrature clock function is the most commonly used input clock function. This is
the default setting for each high speed I/O channel except 11 & 12. This clock function
will typically be used for closed loop control (encoder feedback) or for following
applications
Step/Direction
The step/direction clock funtion would typically be used in an application where a secondary or tertiary
clock output is required to sequentially control an additional axis.
Up/Down
The up/down clock type would typically be used as an output function where a secondary axis is being
driven by a stepper or servo drive with dual-clock direction control circuitry.
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Table 6.5: The Four Clocks and Their Default Line Placement
Figure 6.4: Clock Functions
Up/Down
CW
CCW
Quadrature
Channel A
Channel B
Step Clock
Step Clock/Direction
Direction
