3156B User Manual
Configuring The Instrument 2-4
Racal Instrument © 2005
Logical Address
Selection
The VXIbus Resource Manager identifies modules in the system by
the module’s address. VXIbus logical addresses can range from 0 to
255, however, addresses 1 to 254
only
are reserved for VXIbus
modules. Logical address 0 is reserved for the Resource Manager.
Logical address 255 permits the Resource Manager to dynamically
configure the module logical address.
To change the logical address, use the 8-position DIP switch
accessible from the top right side of the module near the rear end of
the case (switch S1). The switches are marked with numbers 1 to 8.
The Model 3156B uses binary values (2
0
to 2
7
) to set the logical
address using the active low address switch. A switch is active when
its arm is placed in the ON position.
Racal Instruments ships the Model 3156B with the logical address set
to 2.
1
2
3
4
5
6
7
ON
Figure 2-1
Logical Address Set to “2”
Installation
The instrument can be installed in any slot except slot 0 in a VXIbus
mainframe. When inserting the instrument into the mainframe, it
should be gently rocked back and forth to seat the connectors into the
backplane receptacle. The ejectors will be at right angles to the front
panel when the instrument is properly seated into the backplane. Use
two captive screws above and below the ejectors to secure the
instrument into the chassis.
After installation, perform an initial checkout and operational
verification. The instrument can be installed in any slot except slot 0 in
a VXIbus mainframe. When inserting the instrument into the
mainframe, it should be gently rocked back and forth to seat the
connectors into the backplane receptacle. The ejectors will be at right
angles to the front panel when the instrument is properly seated into
the backplane. Use two captive screws above and below the ejectors
to secure the instrument into the chassis.
