Tektronix MSO54, Programmer'S Manual

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Glossary
ASCII
Acronym for the American Standard Code for Information Interchange.
Controllers transmit commands to the instrument using ASCII character encoding.
Address
A 7-bit code that identi fi es an instrument on the communication bus. The
digitizing instrument must have a unique address for the controller to recognize
and transmit commands to it.
Backus-Naur Form (BNF)
A standard notation system for command syntax diagrams. The syntax diagrams
in this manual use BNF notation.
Controller
A computer or other device that sends commands to and accepts responses from
the digitizing instrument.
EOI
A mnemonic referring to the control line End or Identify. One of the two possible
end-of-message terminators.
EOM
A generic acronym referring to the end-of-message terminator. The
end-of-message terminator can be either an EOI or the ASCII code for line feed
(LF).
Equivalent-Time sampling (ET)
A sampling mode in which the instrument acquires signals over many repetitions
of the event. This instrument uses a type of equivalent time sampling called
random equivalent time sampling. It utilizes an internal clock that runs
asynchronously with respect to the input signal and the signal trigger. The
instrument takes samples continuously, independent of the trigger position, and
displays them based on the time difference between the sample and the trigger.
Although the samples are taken sequentially in time, they are random with respect
to the trigger.
Real-Time sampling
A sampling mode where the instrument samples fast enough to completely fi ll a
waveform record from a single trigger event. Use real-time sampling to capture
single-shot or transient events.
IEEE
An acronym for the Institute for Electrical and Electronic Engineers.
Serial poll
A device on the bus can request service from the Controller by asserting the SRQ
line. When a controller acknowledges the SRQ, it serial polls each device on
the bus to determine which device on the bus requested service. Any device
requesting service returns a status byte indicating it needs to be serviced and then
MSO54, MSO56, MSO58, MSO58LP Programmer Glossary-1