RS-232 REMOTE OPERATION
WJ-8711A DIGITAL HF RECEIVER
4-22
4.6.1
STATUS BYTES
The following information discusses the operation of the SRQ interrupt and the "*STB?"
query. The operation of these is very similar. The SRQ interrupt allows the controller to establish which
event has caused the receiver to set the SRQ. The "*STB?" query response includes similar information as
detailed below.
SRQ
- This is a one byte control character (ESC) indicating a service request. When
SRQ is generated, it is immediately followed by the output of the Status Byte Register
if enabled. This clears the SRQ and the Status Byte Register. The evaluation of each
bit in this status byte is in
Table 4-3
.
*STB? Query
- The Status Byte Register can also be read using the *STB? query.
Sending *STB? does not clear the SRQ status line or the Status Byte Register.
The Service Request Enable Register allows status bits to generate service requests. Setting a
status bit will set service request if and only if the corresponding enable bit is set. Service Request Enable
Register bit six is ignored and reported as zero. This bit would correspond to the RQS bit of the Status Byte
Register which triggers service request.
4.6.2
EVENT SUMMARY STATUS REGISTER
The following discussion covers the Event Summary Status Register and the *ESR? query.
See
Table 4-4
for the Event Summary Status Register bit numbers, mnemonics and descriptions.
The Event Summary Status Register is read destructively by the *ESR? query, which clears
the register. The *CLS command also clears the register. The power on sequence automatically sets the
Power On bit and initially resets the remaining bits.
The Event Summary Status Enable Register allows the event flags of the Event Summary
Status Register to be reflected in the Event Summary Bit (ESB) of the Status Byte. The setting of an event
status flag sets ESB high only if the corresponding bit in the Event Summary Status Enable Register is set
high. The Event Summary Status Enable Register is written to with the *ESE command. The data following
the mnemonic is the decimal equivalent of a binary number representing the register bits. The *ESE? query
loads the output buffer with a decimal number, which can be converted to binary to determine the setting of
the Event Summary Status Enable Register.
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Содержание WJ-8711A
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