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VX4101A MultiPaq Instrument User Manual
2–3
VX4101A Operational Modes
The VX4101A MultiPaqtInstrument incorporates multiple instruments in a
single C-Size VXIbus slot. This maximizes functionality while minimizing cost
and space. The innovative design enables you to use each instrument of the
VX4101A as a conventional instrument compliant with IEEE 488.2 protocols.
You can also override IEEE 488.2 protocols and query multiple instruments
simultaneously. The two operational modes are as follows:
H Synchronous mode
H Asynchronous mode
For an example of how to use Asynchronous mode, see Using the VX4101A
MultiPaqtInstrument.
About Synchronous Mode
The Synchronous mode of the VX4101A is based on strict IEEE-488.2
compliance. In the 488.2 model, all instrument activity is sequential.
The IEEE 488.2 standard requires that a query be completed prior to the receipt
of any new commands or queries. A query is completed after the controller has
read the response. For more information on 488.2 compliance, see Chapter 6,
Message Exchange Control Protocol, of the IEEE 488.2 Standard.
Under 488.2 protocols, the other instruments are unavailable during a query. The
488.2 Message Exchange Protocol Enforcer (MEPE) restricts commands and
queries to another instrument module from being sent while a query is in
progress.
NOTE. The default settings for the VX4101A are fully IEEE-488.2 compliant.
About Asynchronous Mode
The multiple instrument architecture of the VX4101A enables you to send
commands to one instrument while receiving query responses from other
instruments. You receive the responses non-sequentially, which decreases test
times and lowers system costs. The instrument accomplishes this with an
alternate mode of operation, the Asynchronous Protocol.