DBS9900 User’s Manual
2-4
DBS9900 Preparation & Installation
82-28993 Revision 01
2.5 Hardware Installation
2.5.1
Installation into a VXI Chassis
When selecting the appropriate VXI chassis, ensure that it meets the cooling and power
requirements specified below. This instrument can be installed in any VXI chassis slot except Slot
0.
One empty slot is required.
The DBS9900 should be FIRMLY inserted into the slot to ensure proper operation.
2.5.2
The DBS9900 Logical Address
Registers in VXIbus devices are located in the A16 address space (within 64 byte blocks). To
determine the unit’s base address, the device’s Logical Address must be known. The Logical
Address is an 8-bit value, which maps to a unique A16 address. The Logical Address selector is
an eight bit dip switch located as shown in the figure below.
The Logical Address value indicated by this selector corresponds to bits 6-13 of the device
register base address. Bits 14 and 15 of the base address are both 1, and the base address is:
Logical Address * 64 + 49152
The DSB9900 is shipped with the base address set to 0xE000 (which maps to Logical Address
128).
To change the shipped DBS9900 Logical Address
Using a needle probe or similar instrument, each of the eight dip switches may be set to the
desired logical address. Simply insert the needle probe through one of the holes in the case and
push the dip switch to the desired setting.
For A16 Base Address 0xC000 – 0xFF80, set switch to the “ON” position for logic 1. Do not set to
0xFFC0. This represents Logical Address 255d, which is used for DC devices and should not be
set for the DBS9900.
In the figure below, S1 is shown in the shipped position.
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