Remote Operation
(3) Bit 5: Event Status Bit (ESB) Summary-Message. Its state indicates if one or more of the
enabled events defined in Standard Event Status have occurred since the last reading or
clearing of the Standard Event Status Register.
(4) Bit 6: Master Summary Status (MSS) Message or Request Service (RQS) Message. The
MSS message indicates that at least one summary-message enabled by the Service Request
Enable Register occurs. The RQS message functions the same way as MSS message except
that it is cleared after serial poll.
(5) Bit 7: Operation Status (OPER) Summary-Message. The Operation Status Registers are
not used in the AC source.
The Status Byte Register can be read with either a serial poll or the *STB? common query. If it
is read with a serial poll, the RQS message is sent for the position of bit 6 and then cleared. If it
is read with the *STB? common query, the MSS message is sent but not changed. The *CLS
common command will cause all Status Data Structures (that is, their Event Registers and Error
Queue) to be cleared so that the corresponding summary messages are cleared. The Output
Queue and its MAV summary message are an exception and unaffected by *CLS.
The Service Request Enable Register selects which summary-messages in the Status Byte
Register may cause the MSS and RQS messages to be TRUE. The undefined bits and bit 6 of
the Service Request Enable Register are always zero. When the RQS message is set TRUE, the
AC source will send an SRQ message to request service asynchronously from the controller in
charge of the GPIB interface. The Service Request Enable Register is cleared at power-on.
6.8 Error Messages
As errors are detected, they are placed in a queue of first in first out. The SYSTem:ERRor?
query can be used to read back the errors in the queue. If the queue overflows, the last error in
the queue will be discarded and replaced with error -350, “Queue overflow”. When all errors
have been read, further error queries will return 0, “No error”.
Error No. Description of the Error [description/explanation/examples]
0 No error
−100 Command error [generic]
−101 Invalid character
6-23
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