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3-4
3.4.3
RQS, Status Byte and Interrupt Check
Action
Commands
Set the 2251A to transmit the RQS when an
WSWrt 03 "*ESE 32" <LF>
error is detected, and force the generation of
WSWrt 03 "*SRE 32" <LF>
Command Error bit of the ESR by sending
WSWrt 03 "XXX" <LF>
erroneous device-dependent command
"XXX" <LF>
Verify that Interrupt Line 02 is asserted.
WSWrt 03 "*STB?" <LF>
(Line 02 is the default level set at the factory,
Verify the value of the Status Byte query is
and will be used in all examples).
96. Refer to Sections 3.14 - 3.16 for more
information about the Status Byte and Error
Reporting.
3.5
Output Message Format
3.5.1
The output strings generated by the 2251A are 21 bytes long. They are of the
form:
<aa> <±><nnnnnnnnnnnn><E><± >< m><cr>< f>
where:
<aa>
is a 2 byte header that describes the measurement mode the 2251A is
in, or the type of data recalled. Refer to Tables 3.1 and 3.2 for the
headers the 2251A can generate.
<±>
describes the polarity of the measurement result.
<nnnnnnnnnnnn> is numerical data. n=0 to 9 or a decimal place (.). Leading zeros
will be added to ensure that 11 bytes are output in this part of the
output string, if required. The decimal point may float to any position
in the field except the first.
<E>
is an exponent indicator.
<mm>
is the exponent that <E> is raised to. m= 0, 3, 6 or 9.
<cr><lf>
is an ASCII terminator
NOTE
The two byte, character header, <aa>, may be removed by the use of Special Function 81.
Two spaces are transmitted.
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Содержание 2251A
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