40 Chapter 4 Principles of Operation
4.3.2 Memory
The 5600 uses three types of memory. RAM memory is retained only while
power is applied to the unit. ROM memory contains the firmware. The third
type of memory is electrically erasable programmable memory: EEPROM.
EEPROM stores calibration constants and other data that must be retained
even when power is removed from the unit, and does not require battery
backup. Examples of data stored in this memory include the laser parameters
and calibration constants.
4.3.3 Laser Interface
The 80188 communicates with the laser driver through a serial port. Parallel
data from the microprocessor is converted to bi-directional serial data at the
asynchronous serial interface.
4.3.4 Front Panel Interface
Provides parallel communication with the front panel.
4.3.5 GPIB Interface
Provides parallel communication with the GPIB port.
4.3.6 RS-232 Serial Interface
Provides communication with the RS-232C serial port.
4.4 Power Supplies
AC power is supplied through the rear panel input power connector which
provides in-line transient protection and RF filtering. The input power
connector contains the fuses and the switch to select series or parallel
connection of the transformer primaries for operation at 100 VAC, 120
VAC, 220 VAC, or 240 VAC.
4.4.1 LDD Power Supplies
These linear supplies provide analog and digital circuit power to the driver.
A switch-mode supply provides drive power for the laser.
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