National Instruments GPIB-BUF - Manual (Page 31)

Chapter 3 Technical Information
© National Instruments Corp. 3-9 GPIB-BUF User Manual
internal data buffer. This mode can be used to prematurely abort a lengthy
plot or print.
Neither Group Execute Trigger (GET), Go To Local (GTL), nor Local
Lockout (LLO) have any effect on the GPIB-BUF.
The GPIB IN port on the GPIB-BUF can only act as a GPIB Talker or
Listener. It should not be passed control. If it is, the GPIB circuitry in the
GPIB-BUF will accept control and immediately assert ATN*. This is an
error condition that can lock up your system and, therefore, should be
avoided.