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4 • Chapter 1 Overview DMC-3425
DMC-3425 Functional Elements
The DMC-3425 circuitry can be divided into the following functional groups as shown in Figure 1.1
and discussed below.
WATCHDOG TIMER
68331
MICROCOMPUTER
WITH
1 Meg RAM
4 Meg FLASH EEPROM
HIGH-SPEED
MOTOR/ENCODER
INTERFACE
I/O INTERFACE
ETHERNET
RS-232
2 UNCOMMITTED
ANALOG INPUTS
HIGH-SPEED LATCH FOR EACH AXIS
3 PROGRAMMABLE,
INPUTS
3 PROGRAMMABLE
OUTPUTS
ISOLATED LIMITS AND
HOME INPUTS
MAIN ENCODERS
AUXILIARY ENCODERS
+/- 10 VOLT OUTPUT FOR
SERVO MOTORS
PULSE/DIRECTION OUTPUT
FOR STEP MOTORS
HIGH SPEED ENCODER
COMPARE OUTPUT
Figure 1.1 - DMC-3425 Functional Elements
Microcomputer Section
The main processing unit of the DMC-3425 is a specialized 32-bit Motorola 68331 Series
Microcomputer with 1 Meg RAM and 4 Meg Flash EEPROM. The RAM provides memory for
variables, array elements and application programs. The flash EEPROM provides non-volatile storage
of variables, programs, and arrays. It also contains the DMC-3425 firmware.
Motor Interface
Galil’s GL-1800 custom, sub-micron gate array performs quadrature decoding of each encoder at up to
12 MHz. For standard servo operation, the controller generates a +/-10 Volt analog signal (16 Bit
DAC). For sinusoidal commutation operation, the controller uses two DACs to generate two +/-10Volt
analog signals. For stepper motor operation, the controller generates a step and direction signal.
Communication
The communication interface with the DMC-3425 consists of one RS-232 port (19.2 kbaud) and one
10base-T Ethernet port.