ADLINK PCI-8164 - Manual (Page 79)

Operation Theory 67
4.1.1 Pulse Command Output
The PCI-/MPC-/PXI-8164 uses pulse commands to control servo/
stepper motors via the drivers. A pulse command has two signals:
OUT and DIR. There are two command types: (1) single pulse out-
put mode (OUT/DIR), and (2) dual-pulse output mode (CW/CCW
type pulse output). The software function,
_8164_set_pls_outmode(), is used to program the pulse
command mode. The modes vs. signal type of OUT and DIR pins
are listed in the table below.
The interface characteristics of these signals can be differential
line driver or open collector output. Refer to section 3.1 for the
jumper setting for different signal types.
Single Pulse Output Mode (OUT/DIR Mode)
In this mode, the OUT signal is for the command pulse (posi-
tion or velocity) chain. The numbers of OUT pulse represent
the relative distance or position. The frequency of the OUT
pulse represents the command for speed or velocity. The DIR
signal represents direction command of positive (+) or negative
(-). This mode is most commonly used. The diagrams below
Mode Output of OUT pin Output of DIR pin
Dual pulse output (CW/CCW)
Pulse signal in plus
(or CW) direction
Pulse signal in
minus (or CCW)
direction
Single pulse output (OUT/DIR) Pulse signal
Direction signal
(level)