Memory; Serial Interface; Front Panel Interface; Gpib Interface - Newport 6000 Operation And Maintenance Manual

34 Chapter 3
3.4.2

Memory

The 6000 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 which 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 TEC and laser parameters and
calibration constants.
3.4.3

Serial Interface

The 80188 communicates with the TEC and laser modules through a serial. Parallel
data from the microprocessor is converted to bi-directional serial data at the
asynchronous serial interface. Also provided is the RS-232 communication.
3.4.4

Front Panel Interface

Provides parallel communication with the front panel.
3.4.5

GPIB Interface

Provides parallel communication with the GPIB port.
3.5

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.
3.5.1

Module Power Supplies

There are two separate module power supplies, one for each module which contains
the laser driver and TEC controller. These linear supplies provide analog and digital
circuit power to each module as well as laser/TEC drive and photodiode bias.
Principles of Operation