www.vtiinstruments.com
EX2500A Web Page Operation
67
•
VME Assignments
: this area allows for the presence and use of VME only instruments in a
rack.
o
Location
: the absolute location of the card in the selected address space. A 24-bit
hexadecimal value is chosen for an A24 address space. A 32 bit hexadecimal value is
chosen for an A32 address space. The value used must be in the range of the starting and
ending addresses selected above.
o
Size
: a hexadecimal value representing the size of memory to allocate for the VME only
card. For example, a 1 MB block is represented as 0x100000.
o
Address Space
: the type of address space the VME only instrument maps to.
o
Current Assignment
: indicates the location, size, and address space of added VME
assignments.
o
Remove
: removes the assignment selected in the current assignment field.
T
RIGGER
C
ONFIGURATION
The
Trigger Configuration
page allows the user to configure the EX2500A’s trigger
mechanisms.
F
IGURE
5-16:
T
RIGGER
C
ONFIGURATION
P
AGE
–
LXI
T
RIGGER
C
ONTROLS
•
LXI Trigger Controls
: there are eight LXI triggers which can be sourced by 19 possible VXI
and LXI triggers. Each LXI trigger can be individually routed to any other LXI, TTL, ECL or
External trigger. The only exception is routing the destination trigger onto itself. For example,
setting the destination trigger bus 0 to the source trigger bus 0 will not route.
o
Destination
: the destination trigger to which the
Source
is routed.
o
Source
: the external trigger which is routed to the
Destination
.
o
Status
: an indication of the logical state (high or low) of the destination trigger. Data is
refreshed when the page is loaded and when a manual control button is executed.
o
Manual Control
: This area allows logical state changes from the web interface. If a
manual control is executed, the Source for that bus line is automatically set to Software
and the previous Source is discarded. Once a manual operation is performed, it is
necessary to reset any affected routes to their previous state.
•
Low
: drives the destination trigger to a logic low state.
•
High
: drives the destination trigger to a logic high state.
•
Pulse
: causes the trigger source to transition from its current state to its opposite
state back to its current state (i.e. if high, the signal will go low, then go high again).
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