Mach-DSP User’s Manual
Document Number: MACH-DSP-9021
Page 9
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3.2
Analog and Digital Command Input
Using the Mach-DSP PC application software (described in Section 7 of this manual),
each axis of the Mach-DSP may select either Analog Input or Digital Input as the source
of the Command signal. Analog Input is the most common, and is the default.
When the Input Source is set to Analog, then the Mach-DSP will receive its Command
signal as a digitized version of the voltage appearing on the 6-pin Analog Command
Input connector. When the Input Source is set to Digital, then the Mach-DSP will receive
its Command signal from through-hole pads (or an optional XY2-100 Interface
Daughterboard) located just to the right of the Status/Control connector.
3.2a
Analog Command Input
The Analog Command Input connector is located on the left side of the board. The
connector pin functions are provided in Table 3.2a:
Table 3.2a: Analog Command Input
Pin
Function
1
+ X-axis command input
2
Ground (see below for details)
3
- X-axis command input
4
+ Y-axis command input
5
Ground (see below for details)
6
- Y-axis command input
Mating Connector Housing:
MOLEX Micro-Fit Jr: 0430250600
Mating Connector Pins:
0430300001 through 0430300012
Specified Wire Size:
AWG #20-#30, depending on pin type
Analog Command Input Description
The analog command input to the Mach-DSP is a true differential input that accepts a
full-scale command of ±10V differential (i.e. ±5V for the + input and ±5V for the – input,
or ±10V for the + input and 0V for the – input). For noise sensitive applications, a true
differential signal should be provided through a twisted and shielded wire pair.
Important Information about Use with a Single-Ended Signal Source
Some industrial clients and university clients use common off the shelf DAC boards
from National Instruments and the like, which offer only a positive (+) signal output and
ground, and do not offer a negative (–) signal output. Clients commonly ask us how to
make the connections between this kind of signal source and the Mach-DSP.
