Keithley 6485 - Figure 10-4 Standard Event Status

Model 6485 Picoammeter Instruction Manual Status Structure 10-11
• Bit B0, operation complete — Set bit indicates that all pending selected device
operations are completed and Model 6485 is ready to accept new commands. This
bit only sets in response to the *OPC? query command. See Section 12 for details
on *OPC and *OPC?.
• Bit B2, query error (QYE) — Set bit indicates that you attempted to read data
from an empty output queue.
• Bit B3, device-dependent error (DDE) — Set bit indicates that an instrument
operation did not execute properly due to some internal condition.
• Bit B4, execution error (EXE) — Set bit indicates that Model 6485 detected an
error while trying to execute a command.
• Bit B5, command error (CME) — Set bit indicates that a command error has
occurred.
Command errors include:
→ IEEE-488.2 syntax error — Model 6485 received a message that does not follow
the defined syntax of the IEEE-488.2 standard.
Figure 10-4
Standard event status
PON
(B7)
CME
(B5)
EXE
(B4)
DDE
(B3)
QYE
(B2)
(B1)
OR
Standard Event
Register
Standard Event
Enable Register
PON = Power On
URQ = User Request
CME = Command Error
EXE = Execution Error
DDE = Device-Dependent Error
QYE = Query Error
OPC = Operation Complete
& = Logical AND
OR = Logical OR
&
&
&
&
&
OPC
(B0)
&
128
(2
7
)
32
(2
5
)
16
(2
4
)
8
(2
3
)
4
(2
2
)
1
(2
0
)
Decimal
Weights
URQ
(B6)
(B15 - B8)
PON
(B7)
CME
(B5)
EXE
(B4)
DDE
(B3)
QYE
(B2)
(B1)
OPC
(B0)
URQ
(B6)
(B15 - B8)
*ESR?
*ESE <NRf>
*ESE?
64
(2
6
)
To ESB bit
of Status Byte
Register
&