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2 Troubleshooting Guidelines
44 82350B Installation and Configuration Guide
• The default formatted IO read buffer size is
4096 so when using
this default size, formatted reads in SICL
(with hint = I_HINT_DONTCARE) and VISA
(with VI_ATTR_DMA_ALLOW_EN =
VI_TRUE) will use Interrupt mode even when
a small number of bytes are expected.
• The default formatted IO write buffer size is
128 so when using
this default size, formatted writes in SICL
(with hint = I_HINT_DONTCARE) and VISA
(with VI_ATTR_DMA_ALLOW_EN =
VI_TRUE) will use Polling mode even sending
a large number of bytes.
• In SICL, Polling mode will always be used for
the iread(), ifread() and iscanf() regardless of
the above settings, when a termchr is set
(itermchr() is not set to -1.
• In VISA, Polling mode will always be used for
viRead(), viBufRead() and viScanf()
regardless of the above settings, when
VI_ATTR_TERM_CHAR_EN = VI_TRUE.
The crossover point at which the Interrupt mode
becomes faster then the Polling mode depends on
the CPU speed, with a faster CPU having a higher
crossover point.