Using IQS Products in an Automated Test Environment
Integrated Qualification System
181
Message Management
Except for the string and binary
block contents, the following
transformations are made on the
incoming data:
character conversion from lower
case to upper case.
conversion of “<wsp>”
characters to spaces.
conversion of multiple blanks to a
single blank.
Parser begins to process messages
when the <PROGRAM MESSAGE
TERMINATOR> is received or if
the input buffer is full.
Output queue
Consists of a First-In, First-Out
(FIFO) data structure.
When the instrument acts as a
talker, it sends response messages
(from the output queue) to the
controller. Response messages all
end with a <
RESPONSE MESSAGE
TERMINATOR>
, see the appendix
on data types.
Total storage capacity: only limited
to the device’s memory.
As soon as there is data in the
output queue, the Message
AVailable bit (bit number 4 –MAV
from the Status Byte register) is set
to 1.
Remains empty if no query is
received or if the query contains
an error.
The Output queue will be
cleared by:
Reading all the items it
contains.
Turning off the power.
Sending a Device Clear
(DCL) message to the
instrument.
Sending a
Selected Device Clear
(SDC) message to the
instrument.
Attempting to send a
command before
reading the responses to
previous queries (an
error will also be
raised).
Data structure
Characteristics
Clearing
Summary of Contents for IQS-600 Series
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