National Instruments Corporation GPIB-1014P User Manual page 54

Section Four
Bit Mnemonic
5r LOK
5w DMAO
4r REM
4w DMAI
3r CO
3w CO IE
© National Instruments Corporation
Description
pon: power on reset
Read ISR2: Bit is cleared immediately after it is read.
The SRQI bit indicates that a GPIB Service Request (SRQ) message has
been received while the TLC Controller function is active (CIC=1).
Lockout Bit
LOK is used, along with the REM bit, to indicate the status of the TLC
GPIB Remote/Local (RL) function. If set, the LOK bit indicates that the
TLC is in Local With Lockout State (LWLS) or Remote With Lockout
State (RWLS). LOK is a non-interrupt bit.
DMA Out Enable Bit
The DMA feature is not implemented. Do not set this bit.
Remote Bit
This bit is true whenever the TLC GPIB RL function is in one of two
states: Remote State (REMS) or Remote With Lockout State (RWLS).
The TLC RL function enters one of these states when the System
Controller has asserted the Remote Enable line (REN), and the
Controller-In-Charge addresses the TLC as a Listener.
DMA Input Enable Bit
The DMA feature is not implemented. Do not set this bit.
Command Out Bit
Command Out Interrupt Enable Bit
CO is set when:
(CACS & SGNS) becomes true
CO is cleared by:
(Read ISR2) + -(CACS) + -(SGNS)
Notes:
CACS:GPIB Controller Active State
SGNS:GPIB Source Generate State
Read ISR2: Bit is cleared immediately after it is read.
CO = 1 indicates CDOR is empty and that another command can be
written to it for transmission to the GPIB without overwriting a previous
command.
4-17
Register Bit Descriptions
GPIB-1014P User Manual