Galil DMC-2X00 - Manual (Page 230)

active high logic and care should be taken. Using active low logic should avoid any problems
associated with the outputs floating high.
Configuring the Amplifier Enable for ICM-2900 / ICM-
1900
The ICM-1900 and ICM-2900 modules can be configured to provide an active low signal to enable
external amplifiers. These modules can also be configured for voltage levels other than TTL.
-LAEN Option:
The standard configuration of the AEN signal is TTL active high. In other words, the AEN signal will
be high when the controller expects the amplifier to be enabled. The polarity can be changed when
using a Galil Interconnect Module. To change the polarity from active high (5 volts = enable, zero
volts = disable) to active low (zero volts = enable, 5 volts = disable), replace the socketed IC, 7407,
with a 7406. These IC’s are labeled U6 on the ICM-1900 and U2 on the ICM-2900 and can be
accessed by removing the cover. This option can be requested when ordering the unit by specifying
the -LAEN option.
-Changing the Amplifier Enable Voltage Level:
To change the voltage level of the AEN signal, note the state of the resistor pack, labeled RP1 on the
ICM-1900 / ICM-2900. When Pin 1 is on the 5V mark, the output voltage is 0-5V. To change to 12
volts, pull the resistor pack and rotate it so that Pin 1 is on the 12 volt side. If you remove the resistor
pack, the output signal is an open collector, allowing the user to connect an external supply with
voltages up to 24V.
100-PIN
HIGH
DENSITY
CABLE
AMPENX
GND
ICM-1900 / ICM-2900 DMC-2000
+5V +12V
SERVO MOTOR
AMPLIFIER
7407 Open Collector
Buffer. The Enable signal
can be inverted by using a
7406. Accessed by
removing ICM-2900 cover.
Connection to +5V or +12V made through
Resistor pack RP1. Removing the resistor pack
allows the user to connect their own resistor to
the desired voltage level (Up to24V). Accessed
by removing ICM cover.
Figure A-5
220
• Appendices
DMC-2X00