© National Instruments
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3-1
3
Signal Connections
This chapter describes how to make input and output signal connections directly to the National
Instruments 951x drive interface modules and describes the associated I/O circuitry.
Table 3-1 describes the signals available on the modules.
Table 3-1.
NI 951x Signal Reference
S
ignal
S
ignal Name
S
ignal Overview
Stepper Command
Signals
Step (CW)+
Step (CW)-
• Configurable Step/Direction or
CW/CCW output mode
• Configurable single-ended or
differential output type
• 5 MHz max pulse rate
Direction (CCW)+
Direction (CCW)-
Servo Command
Signals
Drive Command
• Separate reference to help keep
digital noise separate from the
analog output
• 16-bit analog output
• ±10 V range
Drive Command
COM
Drive Enable
Drive Enable
• Connects to the enable function of
the drive
• 0 to 30 V output configurable as
sinking or sourcing
• 100
μ
s minimum output pulse width
