Table of Contents
Advertisement
REQUESTING SERVICE
52
The
instrument can be
set,
by
means
of
device-dependent
commands,
to
request
service
from
the controller
by
sending an
interrupt
request
(IRQ).
(1)
A
response
message
is
ready.
(2)
A
VXIbus
defined
error
occurs.
(3)
A
device defined error
occurs.
(4)
A
change
of
frequency standard
occurs.
53
The
generation
of
the
IRQ
may
also
be
inhibited.
Generation
of
all
IRQs
is
disabled
when
the
instrument
is
first
switched
on.
STATUS
BYTE
54
The
format
of the status
byte,
generated in response
to
a
'READ
STB'
command,
is
given
in
TABLE
4.10.
SETTING
THE ENABLE
REGISTERS
55
The Enable
Registers
to
be
set
up
are as follows:
(1)
Service
Request Enable
Register
-
set
using
*SRE.
(2)
Standard
Event
Status Enable Register
-
set
using
*ESE.
(3)
Device Defined
Event
Status
Enable
Register
-
set
using
ESE.
56
Each
bit
in
an enable
register
set
to
logic
'l*
enables the equivalent
bit
in
its
associated
service register,
see
Table
4.9 for
Associated
Registers.
Table
4.9
Associated Registers
Enable
Register
Service Register
Service
Request
Enable
Status Byte Register
Register
Standard Event
Status
Standard Event
Status
Enable
Register
Register
Device
Defined Event
Device Defined Event
Status
Enable
Register
Status Register
4-18
2151
OPS
A
1571/DA
Advertisement
Table of Contents
