Chapter 5
Configure Your Software with IBCONF
© National Instruments Corp.
5-13 GPIB-232CT-A for MS-DOS/Windows
Enable CIC Protocol (Board Characteristic Only)
If a device-level NI-488 call is made after control has been passed to
another device, enabling this protocol causes the board to assert SRQ with a
Serial Poll status byte of hex 42. The current Controller must recognize that
the board wants to regain control. If the current Controller passes control
back to the board, the device call proceeds as intended. If control is not
passed within the timeout period, the error ECIC results from the call. If the
CIC protocol is disabled, ECIC is returned immediately if a device call is
made after control has been passed. The default option for this
characteristic is
no
.
Bus Timing (Board Characteristic Only)
This field specifies the T1 delay of the source handshake capability for the
board. This delay determines the minimum amount of time, after the data is
placed on the bus, that the board may assert DAV during a write or
command operation. If the total length of the GPIB cable length in the
system is less than 15 m, then the value of
350nsec
is appropriate.
There are other factors that may affect the choice of the T1 delay, although
they are unlikely to affect you. Refer to the ANSI/IEEE 488.2-1987
Standard, IEEE Standard Codes, Formats, Protocols, and Common
Commands , for more information about these other factors.
The default option is
500nsec
.
Enable Repeat Addressing (Device Characteristic Only)
Normally, devices are addressed before a read or write operation is
performed only if they are not already properly addressed for the read or
write operation. If
yes
is selected, read or write operations always
readdress even if the device is already properly addressed. The default
option is
no
.
Use This Interface (Board Characteristic Only)
If you do not want the driver to try to access an interface (because you do
not have an interface in the system), select
no
for this option. When this
field is set to
no
, the driver does not try to access the interface hardware. It
