Default DIP Switch Settings
The Digital488/80A unit may be operated from either 110 VAC or 220
VAC. The operating voltage is set by an internal switch. The factory
set operating voltage appears on the label placed over the power jack on
the rear panel. To change the operating voltage, see section
Line
Voltage Selection
in
Chapter 3: Digital488/80A Power & Assembly
.
The Digital488/80A unit has one 8-microswitch DIP switch (S1)
accessible from the rear panel. This DIP switch determines the IEEE
488 bus address and its addressing mode. The switch is read only when
the unit is powered on
and should be set prior to applying power
. The
figure illustrates the factory default for the DIP microswitch settings:
IEEE 488 bus address = 8, and Addressing Mode = Dual Primary. In
the Dual Primary addressing mode, DIP microswitches 6 and 7 are
ignored.
Note:
DIP switch S1 is read only during power up. For this reason you must make any setting changes
prior to applying power to the unit.
To modify the default settings, disconnect the power cord from the AC line and change the microswitch
settings using a small screwdriver. The enclosure does not need to be opened to change the DIP
microswitch settings.
IEEE 488 Bus Address Selection
The IEEE 488 bus address is set by positioning the
rear-panel DIP microswitches 1 through 5. The
address can be set from 0 through 30 and is read
only at power on. The address is selected by
simple binary weighting with microswitch 1 being
the Least Significant Bit (LSB; with a value of 1)
and microswitch 5 the Most Significant Bit (MSB;
with a value of 16). The factory default setting is
address 8, as shown in the diagram.
Note:
If address 31 is selected, it defaults to
address 30 because the IEEE 488
standard has reserved address 31.
Note:
The Digital488/80A bus address must
agree with the IEEE 488 controller
address.
Addressing Mode Selection
The Digital488/80A can be operated in one of two
addressing modes:
Dual Primary addressing mode
or
Secondary addressing mode
, which are selected
by the rear-panel DIP microswitch 8. The factory
default setting for microswitch 8 is
Dual Primary
addressing mode
, in the "up" position as shown in
the diagram. A detailed description of the Dual
Primary and Secondary addressing modes is
provided in the following text.
Digital488/80A User’s Manual
11-08-02
Digital488/80A Setup 7
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