Keithley S46 Instruction Manual page 66

S46/S46T Microwave Switch System Instruction Manual
The bits of the Status Byte Register are described as follows:
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*TST? — self-test query
Use this query command to perform a self-test for the system.
When the unit is addressed to talk, the coded result is sent from the output queue to the
computer. A returned value of one (1) indicates that the test passed, and a value of zero (0)
indicates that the test failed.
*WAI — wait-to-continue
Effectively, the *WAI command is a no-op (no operation) for the relay unit and therefore,
does not need to be used.
Two types of device commands exist:
Sequential commands — A command whose operations are allowed to finish before the
next command is executed.
Overlapped commands — A command that allows the execution of subsequent
commands while device operations of the overlapped command are still in progress.
The *WAI command is used to suspend the execution of subsequent commands until the
device operations of all previous overlapped commands are finished. The *WAI command
is not needed for sequential commands.
Bit 0 — Not used.
Bit 1 — Not used.
Bit 2, Error Available (EAV) — A set bit indicates that an error or status message
is present in the Error Queue. The message can be read using one of the following
SCPI commands:
– :SYSTem:ERRor?
– :STATus:QUEue?
Bit 3 — Not used.
Bit 4, Message Available (MAV) — A set bit indicates that a message is present
in the Output Queue. The message is sent to the computer when the S46/S46T is
addressed to talk.
Bit 5, Event Summary Bit (ESB) — A set bit indicates that an enabled standard
event has occurred. The event can be identified by reading the Standard Event
Status Register using the *ESE? query command.
Bit 6, Master Summary Status (MSS)/Request Service (RQS) — A set bit
indicates that one or more enabled Status Byte conditions have occurred. Read the
MSS bit by using the STB? query command, or perform a serial poll to detect the
occurrence of a service request (RQS bit set).
Bit 7 — Not used.
Run self test and read result
Wait until previous commands are completed
S46-901-01 Rev. C / January 2006
Operation 3-31