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6.5.10.3
*ESE?
This query command returns the Event Status Enable Register (see 6.5.10.2
above).
6.5.10.4
*ESR?
This query command returns the Event Status Register. It also clears the Event
Status Register and the ESB bit of the Status Byte Register. The value returned
indicates the condition of each of the eight bits of the register by adding the bi-
nary-weighted values of each bit. The meaning of each bit, when set (1) , is as
follows where 0 is the least significant and 7 is the most significant:
0
Operation complete (OPC). Execution of the last command is completed.
1
Request control (RQC). No function for this instrument.
2
Query error (QYE). An attempt has been made to read data when none is
available or pending.
3
Device dependent error (DDE). A hardware error condition occurred.
4
Execution error (EXE). An invalid parameter for a command has been
received or the command could not be executed under existing
conditions.
5
Command error (CME). An unrecognized command or a command with
improper syntax has been received.
6
User request (URQ). No function for this instrument.
7
Power on (PON). Always set after the power is switched on.
The ESB bit of the Status Byte Register (Section 6.5.10.9) is set (1) whenever
any bit of the Event Status Register is set and its corresponding mask bit in the
Event Status Enable Register (Section 6.5.10.3) is set. The Event Status Regis-
ter is cleared when queried with the ESR? command or when the *CLS com-
mand is received. The response in the following example would be given after
an invalid command is received by the 1560 and no other error occurred.
6.5.10.5
*OPC
This command causes the Operation Complete (OPC) event bit in the Event
Status Register to be set as soon as all pending command operations are com-
pleted. Since all commands are sequential for this instrument this command is
unnecessary.
Example command: *ESE?
Example response: 48
Example command: *ESR?
Example response: 32
6 Digital Communications Interface
Commands
103
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