National Instruments GPIB-MAC User Manual page 80

November 1985
sic - Send Interface Clear
sic: Specialized Controller function
Syntax: sic [time] <CR>
Purpose: You use sic if the initialization, I/O, and bus manage-
ment functions do not meet the needs of your device, and
you wish more precise control over the GPIB. sic
makes the GPIB-MAC CIC and initializes the GPIB.
sic is not a function you will use frequently because in
most cases the first I/O or bus management function you
call will do this automatically.
Remarks: The argument time is a numeric string specifying any
number of seconds between .OOOl and 3600, which
corresponds to time limits between 100 microseconds
and 1 hour. time must not contain a comma.
If you call sic without an argument, IFC is sent for 500
microseconds. The action of asserting IFC for at least
100 microseconds initializes the GPIB and makes the
interface board become CIC. When needed, sic is
generally used at the beginning of a program to make the
GPIB-MAC CIC and is used when a bus fault condition
is suspected.
The IFC signal resets only the GPIB interface functions
of bus devices and not the internal device functions.
Device functions are reset with the clr programming
message. To determine the effect of these messages,
consult the device documentation.
If you are in a debugging environment, you may want to
vary the amount of time IFC is asserted. For example,
you may set time to 10 seconds to allow you to check on
a bus analyzer that IFC is actually being asserted.
Otherwise, you do not need to include the time
argument.
69 SECTION FOUR - FUNCTIONS