The Status Byte register
is
used to record a summary of current system
conditions for the status reporting system. It is returned to the controller
when a serial poll of the 2832€
is
conducted or when the 'STB? query is
issued. The register
is
bit mapped, meaning that each condition
is
represented
by a bit. When a bit
is
set, or has a value of 1, then the condition
is
true. The
bits are cleared based on the conditions described for each bit.
The Service Request Enable register
is
used to define the conditions that will
generate a IEEE 488.1 <SRQ>. When an event occurs that causes
a
bit to be set
in the Status Byte register and it's corresponding bit
is
set in the Service
Request Enable register, then a <SRQ> will be generated.
The Service Request Enable Register
is
configured by using the 'SRE common
command.
The Parallel Poll Enable Register
is
used with the Status Byte to generate the
<]ST> message.
If
any bit
is
set in the Status Byte and it's corresponding bit is
set in the Parallel Poll Enable Register, then the <]ST> message is set true
(a
value of one). Otherwise the <IST> message
is
set false (a value of zero).
When a parallel poll
is
conducted with the 2832€ configured to respond to it,
the <IST> message
is
compared to the <S BIT> (sense bit).
If
they
are
the same
then the configured data line will be driven true in response to the parallel poll.
Both the <S BIT> and the data line driven during a parallel poll can be selected
by the IEEE 488.1 parallel poll remote configuration command.
The Parallel Poll Enable Register
is
configured by using the 'PRE command.
The Status Byte Register
is
described below.
Status
Byte
bit
7:
Error Queue
A
one in this bit indicates that the error queue
is
not empty (see the
*ERR? query). The *CLS command will empty the error queue and, as a
result. this bit.
bit
6:
Service RequestIMaster Summary Status
When the status byte
is
read by means of a serial poll, this bit is set
when the 2832€
is
requesting service.
When the status byte
is
read by means
of
the *STB? query, this bit will
be set
if
any bit in the status byte
is
set and its corresponding bit is set
in the Service Request Enable Register.
bit
5:
Event Status Byte
The Event Status Byte bit is set when a bit in the Standard Event Status
register
is
set and its corresponding bit in the Standard Event Enable
register
is
set. The *CLS command or *ESR? query will clear the Stan-
dard Event Status register and,
as
a result, this bit.
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