National Instruments Corporation GPIB-1014P User Manual page 70

Section Four
Table 4-5. Auxiliary Commands: Detailed Description (continues)
Command Code
(COM4-COM0)
4 3 2 1 0
0 0 1 1 1
0 1 1 1 1
0 0 0 0 1
0 1 0 0 1
1 0 0 0 0
1 0 0 0 1
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Description
Non-Valid Secondary Command or Address
The Non-Valid command releases the GPIB DAC message held off
by the Address Pass Through (APT). The TLC is permitted to
operate as if an Other Secondary Address (OSA) message has been
received.
Valid Secondary Command or Address
The Valid command releases the GPIB DAC message held off by
APT and allows the TLC to function as if a My Secondary Address
(MSA) message had been received. The DAC message is released
at the time of Command Pass Through (CPT). DAC is also released
if DCAS or DTAS is in Holdoff state.
Clear Parallel Poll Flag
Set Parallel Poll Flag
These commands set the Parallel Poll Flag to the value of COM3.
The value of the Parallel Poll Flag is used as the local message
ist when bit four of Auxiliary Register B is zero. The value of
SRQS is used as the ist when ISS=1.
Go To Standby
The Go To Standby command sets the local message gts if the TLC
is in Controller Active State (CACS) or when it enters CACS.
When the TLC leaves CACS, gts is cleared.
Take Control Asynchronously
The Take Control Asynchronously command pulses the local
message tca.
4-33
Register Descriptions
(continues)
GPIB-1014P User Manual