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4.9 Output Queue
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4.9 Output Queue
4.10 Input Buffer
Response messages accumulate in the output queue and are read out as data
and cleared by the controller.
The output queue is also cleared in the following circumstances:
・
When a device clear is issued.
・
When the power is turned off and turned on again.
The 3157 has an output queue of 300 bytes capacity. If the response messages
overflow this limit of 300 bytes, a query error is generated, and the output
queue is cleared. Further, if a new message is received while the output
queue still contains data, the output queue is cleared, and a query error is
generated.
The 3157 has an input buffer of 300 bytes capacity. Messages which are
received are put into this buffer and executed in order. If the data
accumulated in this buffer exceeds 300 bytes the buffer becomes full, and until
a space again becomes available in the buffer the GP-IB interface bus goes
into the waiting state.
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