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Status bytes are cleared (except STB 4) when reading them with the
command STB, but not with TSTB. They are also cleared on POWER ON and
by a Device Clear command. Mask registers are cleared on POWER ON, with
a Device Clear command, or by writing 0 into them.
Main Status
Byte
(STB 1):
DI0
# Bit
# Associated
(1-8)
(0-7)
data
Significance
(to
generate
an SRQ)
DIO-I
0
none
DIO-2
1
STB 2
DIO-3
2
STB 3
DIO-4
3
STB
4
DIO-5
4
STB 5
DIO-6
5
STB 6
DIO-7
6
none
DIO-8
7
none
VALUE ADAPTED
unspecified
SOFTKEY PRESSED or
CALL TO HOST
INTERNAL STATE has
CHANGED
OPERATION COMPLETE
ERROR detected
RQS (request for service)
MESSAGE READY
If one
of the
bits
DIO-I
to DIO-6
or DIO-8
becomes
1 and
the
corresponding bit is set in the Main Mask register (MASK I), the RQS
bit is set to i, and a service request (SRQ) is generated if it is not
already pending. The bits associated with the lower status bytes (STB
to 6) are only set inside STBI if their masks allow the propagation of
the bits to STB1 (see description
of the individual
status
bytes
below).
VALUE ADAPTED: set if a value associated
with a remote control
command is out of range, and adapted to the closest legal value.
Bit I (DIO-2): reserved.
SOFTKEY PRESSED: set if one of the 9 soft keys (in REMOTE) or
the key CALL TO HOST (in LOCAL) has been pressed. The last key
only active
after being
setup by the command
CALL HOST. The
identity of the soft key is coded in the SOFTKEY PRESSED status
byte (STB3).
INTERNAL STATE CHANGE: set if an internal state within the 9400A
has changed. The identity of the internal state is recorded in the
INTERNAL STATE status byte (STB 4).
OPERATION
COMPLETE:
set if an operation
in the 9400A has been
completed. The associated OPERATION COMPLETE status byte (STB5)
contains the information about which operation has been completed.
ERROR: set if an error condition has been detected.
The error is coded in the associated ERROR status byte (STB 6).
Remote Operations
7-35
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