ADLINK PCI-8154 - Manual (Page 78)

68 Operation Theory
Dual Pulse Output Mode (CW/CCW Mode)
In this mode, the waveform of the OUT and DIR pins represent
CW (clockwise) and CCW (counter clockwise) pulse output
respectively. The numbers of pulse represent distance in pulse.
The frequency of the pulse represents speed in pulse per second.
Pulses output from the CW pin makes the motor move in positive
direction, whereas pulse output from the CCW pin makes the
motor move in negative direction. The following diagram shows
the output waveform of positive (+) commands and negative (-)
commands.
The command pulses are counted by a 28-bit command counter.
The command counter can store a value of total pulses outputting
from controller.