Hioki 3541 - Output Queue and Input Buffer

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8.4 Communication Methods
8.4.2 Output Queue and Input Buffer
Output Queue Response messages are stored in the output queue until read by the
controller. The output queue is also cleared in the following
circumstances:
• Power on
• Device clear
• Power on
• Query Error
The output queue capacity of the instrument is 64 bytes. If response
messages overflow the buffer, a query error is generated and the
output queue is cleared.
Also, with GP-IB, if a new message is received while data remains in
the output queue, the output queue is cleared and a query error is
generated.
Input Buffer The input buffer capacity of the instrument is 256 bytes.
If 256 bytes are allowed to accumulate in this buffer so that it becomes
full, the GP-IB interface bus enters the waiting state until space is
cleared in the buffer.
The RS-232C interface will not accept data beyond 256 bytes.
Ensure that the no command ever exceeds 256 bytes.