Chapter 4
Software Reference
© National Instruments Corp.
4-7
GPIB-410 User Manual
Participate in Handshake
Use this field to specify whether the GPIB-410 should perform the
acceptor handshake when capturing data or command transfers. There
are two options:
•
yes
(perform handshaking)
•
no
(do not perform handshaking)
Selecting
yes
causes the GPIB-410 to perform the acceptor handshake
only when a data or command byte is transferred on the GPIB and that
type of transfer is also a selected capture event. Performing the
handshake helps prevent capture loss during periods of sustained high-
speed transfers. Selecting
no
disables participation in the handshake
and therefore prevents the GPIB-410 from interfering with the bus
activity being captured.
This handshake feature is independent of the ACP handshaker <Alt-A>.
Buffer Setup: Maximum Capacity
Use this field to allocate a fixed amount of memory in which to store
captured bus samples. (One bus sample requires two bytes of memory.)
The capture buffer is defined in terms of the maximum number of 2-byte
entries that can be made in it while capturing is in progress. Subject to
the memory limitations of your computer, any size from 16 to 65535
entries can be entered (default = 256 entries).
If the software is unable to allocate a buffer of the requested size, an
error is returned and the size of the largest buffer available is displayed
in this field.
Warning:
Resizing the capture buffer can cause existing buffer
entries to be lost or truncated.
Buffer Setup: Action When Buffer Full
Use this field to specify the action to be taken when the capture buffer
fills to capacity while capturing. There are two options.
•
stop capture
(single-pass)
•
reset and continue
(multi-pass)
