Galil DMC-13X8 user manual TTL Inputs, ICM-1900/2900

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 and the amplitude can be changed if you are using the ICM-1900interface board. To change the polarity from active high (5 volts= enable, zero volts = disable) to active low (zero volts = enable, 5 volts= disable), replace the 7407 IC with a 7406. Note that many amplifiers designate the enable input as ‘inhibit’.

To change the voltage level of the AEN signal, note the state of the resistor pack on the ICM-1900. 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.

DMC-1700/1800

100-PIN HIGH DENSITY CABLE

ICM-1900/2900
+12V	+5V

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 Interconnect cover.

AMPENX	SERVO MOTOR
	AMPLIFIER
GND

MOCMDX

7407 Open Collector Buffer. The Enable signal can be inverted by using a 7406. Accessed by removing Interconnect cover.

Analog Switch

Figure 3-3 - Connecting AEN to the motor amplifier

TTL Inputs

The reset is a TTL level, non-isolated signal and is used to locally reset the DMC-13X8 without resetting the PC.

The firmware of the controllers allows unused auxiliary encoder inputs to be used as general purpose inputs. These buffered inputs give an additional 2 inputs per unused auxiliary encoder input. On a four axis controller, these inputs can be queried using @IN[81] - @IN[88]. Hardware connection of these inputs is made through the A and B channels of the corresponding auxiliary encoder axis.

Chapter 3 Connecting Hardware • 42 USER MANUAL