HP 8642A - Page 62

Operation
Model 8642A/B
Status Byte (cont'd)
Table 3-7. HP-IB Status Byte Bit Definitions
Bit
0
1
2
3
4
5
6
7
1
Also
2
lf th
erro
HP-IB Operating
Condition
END OF SWEEP
HARDWARE ERROR
EXECUTION ERROR
LOCAL/REMOTE
READY
ERROR
RQS (IEEE-488)
PARAMETER
CHANGED
reset with IP, CS, Device Cle
at bit was causing SRQ to be
r because the error is cleared
Condition
Single sweep finished.
Instrument out-of-lock,
reverse-power tripped, or
instrument firmware
malfunction.
Syntax or function
execution error.
Instrument in local
operation.
Typically always set.
Logical OR of bits 1 and 2.
RQS mask is ANDed with
the Status Byte and the
result is not equal to 0
(refer to Service Request
for more information).
Previous setting has been
automatically changed; for
example, FM is turned off
when $lv1 becomes active.
ar, Selected Device Clear, Power On.
nulled, you must also read the Status E
only after the reading.)
Comments
Reset with auto, manual, or a new single sweep, or
sweep mode off.
12
Reset with an Output Hardware Error message to the
8642A/B (HP-IB program code "OH").
12
More than one
Hardware Error message may be present. After "OH"
is executed, one error message code or string is out-
put with each address to talk. (The Detailed Operating
Instruction, Messages, lists the error codes with their
respective messages.)
To properly retrieve all Hardware Error information, re-
fer to the example program in Data Output in this
HP-IB information section.
Reset with an Output Execution error message to the
8642A/B (HP-IB program code "OE").
1
'
2
Error code that
caused bit to be set can be determined by reading the
Output Execution Error code or string. Refer to the ex-
ample program in Data Output in this HP-IB informa-
tion section.
Reset when remote. Can be used to detect a front-
panel SRQ (emulated by selecting the LOCAL key if
not in Local Lockout).
2
The Status Byte must actually be read with this bit set
for the instrument to have completed the processor
delay time part of the setting change which might not
include the analog settling time.
Reset when bits 1 and 2 are reset.
1
Reset when the RQS mask ANDed with the Status
Byte (ignoring bit 6) equals 0.
Reset with an output Parameter Changed message
(HP-IB program code "OC").
1
'
2
Parameter that was
changed can be determined by transmitting the Output
Parameter Changed message code or string. Refer to
the example program in Data Output in this HP-IB in-
formation section.
Bit 1 is cleared only if all hardware errors are resolved.)
)yte again to actually reset that bit. (This second reading will still show the
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