Keithley 7999-6, Инструкция по эксплуатации

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3-20 Operation
Figure 3-7
Standard event enable register
*ESR? - Event Status Register Query
Reads then clears the standard event status
register
Use this command to acquire the value (in decimal) of the Standard Event Register (see Fig-
ure 3-8). The binary equivalent of the returned decimal value determines which bits in the reg-
ister are set. The register is cleared on power-up.
A set bit in this register indicates that a particular event has occurred. For example, for an
acquired decimal value of 48, the binary equivalent is 00110000. From this binary value, bits
B4 and B5 of the Standard Event Status Register are set. These bits indicate that a device-
dependent error and command error have occurred.
The bits of the Standard Event Status Register are described as follows:
• Bit B0, Operation Complete — A set bit indicates that all pending selected device
operations are completed and the Model 7999-6 is ready to accept new commands. This
bit only sets in response to the *OPC command. It is not affected by the *OPC?
command.
• Bit B1 — Not used.
•
Bit B2, Query Error (QYE)
— A set bit indicates that you attempted to read data from
an empty Output Queue.
• Bit B3, Device-Dependent Error (DDE) — A set bit indicates that an instrument
operation did not execute properly due to some internal condition.
Events: PON = Power On
CME = Command Error
EXE = Execution Error
DDE = Device-Dependent Error
QYE = Query Error
OPC = Operation Complete
128
(2
7
)
32
(2
5
)
16
(2
4
)
8
(2
3
)
4
(2
2
)
1
(2
0
)
(B15 - B8)
PON CME EXE DDE QYE OPC
Bit position
Event
Decial Weighting
B7 B5 B4 B3 B2 B1 B0 B6
0/1
Value
0/1 0/1 0/1 0/1 0/1
Value: 1 = Enable Standard Event
0 = Disable (Mask) Standard Event
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