PMDX-132 User’s Manual
PCB Revision: PCB-466A
Document Revision: 1.0
Serial Numbers: 23410 and above
PMDX-132_Manual_10.doc
©2008 Practical Micro Design, Inc.
Page 19 of 24
17 April 2008
All Rights Reserved
4.9.1 Disable Signal
This signal is not present on every Gecko model, and is not connected on the PMDX-132. The
PMDX-132 implements the “motor disable” function by commanding the motor current to a minimum
value using the current setting resistor terminals (see section 3.5.3 for additional information).
4.9.2 Step & Direction Signals
The step and direction signals are hard-wired to specific motor driver connectors (see Table 7 on page
16). These signals are buffered on the PMDX-132. However, they are
not
optically isolated by the
PMDX-132 because the Gecko stepper driver modules have optical isolation on the step and direction
inputs.
4.9.3 +5V Common
The PMDX-132 pr5 volts for the Gecko step and direction opto-couplers. Your Gecko stepper
drivers should be jumpered for +5VDC common if equipped with a jumper. The Gecko 201 and 202
drives do not have such a jumper and are always configured for +5VDC common, unless they have the
G901 option board installed (which provides a step multiply function).
4.9.4 Rset Signals
These signals are used to connect a current setting (programming) resistor to the Gecko stepper motor
drivers. The resistors are mounted on the PMDX-132 board and internally connected to these terminals
on the Gecko stepper drivers.
4.10 PMDX Expansion Connector (J23)
Provides power and control signals to PMDX accessory boards such as the PMDX-106 Spindle Speed
Controller.
5.0 Jumpers
The PMDX-132 contains eight 3-pin jumpers that determine various aspects of its behavior. Each jumper
has silk screen labels that describe the function of the jumper, and each possible setting. Each jumper
should have a shorting block installed either between pins 1 and 2, between pins 2 and 3, or on some
jumpers the shorting block can be removed. Figure 10 shows the location of all of the jumpers on the
PMDX-132.
