Register Bit Descriptions Chapter 4
GPIB-1014 User Manual 4-32 © National Instruments Corporation
Table 4-5. Auxiliary Commands: Detail Description (continued)
Command Code
(COM4-COM0)
4 3 2 1 0 Description
1 1 0 1 1 In continuous mode, the local message rdy is issued when the
(continued) Acceptor Not Ready State (ANRS) is initiated unless data block
transfer end is detected (END RX bit equals one). When END
is detected, the TLC is placed in the RFD Holdoff state, preventing
generation of the rdy message. In continuous mode, the DI bit is
not set when a data byte is received. The continuous mode caused
by the Listen in Continuous Mode command is released when the
Listen auxiliary command is issued or the TLC enters the Listener
Idle State (LIDS).
1 1 1 0 0 Local Unlisten
The Local Unlisten command generates the local message lun in
the form of a pulse.
1 1 1 0 1 Execute Parallel Poll
The Execute Parallel Poll command sets the local message Request
Parallel Poll (rpp). The rpp message is cleared when the TLC
enters either Controller Parallel Poll State (CPPS) or Controller
Idle State (CIDS). The transition of the TLC interface function is
not guaranteed if the local messages rpp and Go To Standby (gts)
are issued simultaneously when the TLC is in Controller Active
State (CACS) and Source Transfer State (STRS) or Source Delay
State (SDYS).
1 1 1 1 0 Set IFC
1 0 1 1 0 Clear IFC
These commands generate the local message request system
control (rsc) and set Interface Clear (IFC) to the value of COM3.
These commands should only be issued if the System Controller
(SC) bit in CFG2 is set; that is, the GPIB-1014 is SC. In order to
meet the IEEE 488 requirements, you must not issue the Clear IFC
command until IFC has been held true for at least 100 µsec.
1 1 1 1 1 Set REN
1 0 1 1 1 Clear REN
These commands generate the local message rsc and set REN to
the value in COM3. These commands should only be issued if the
SC bit in CFG2 is set; that is, the GPIB-1014 is SC. In order
to meet IEEE 488 requirements, you must not issue the Set REN
command until REN has been held false for at least 100 µsec.
1 0 1 0 0 Disable System Control
The Disable System Control command clears the local message rsc
and clears the SC bit.