Measurement-computing GPIB-488 Bedienungsanleitung PDF herunterladen (Seite 105)

Appendix B IBSTA

GPIB-488 B-3 Programming Reference Manual

RQS Device Requesting Service. If this bit = 1, a device is requesting service. RQS

is set in the status word whenever the hex 40 bit is asserted in the serial poll

status byte of the device. The serial poll that obtained the status byte may have

been the result of an

ibrsp or the poll may have been automatically performed

if automatic serial polling is enabled. RQS is cleared when an

ibrsp reads the

serial poll status byte that caused the RQS. An

ibwait on RQS should only be

done on devices that respond to serial polls.

CMPL I/O Completed. When set, this bit indicates that all I/O operations have been

completed. CMPL is cleared while I/O is in progress.

LOK Lockout State. Indicates whether the board is in a lockout state. While LOK is

set, the

EnableLocal routine or ibloc function is inoperative for that board.

LOK is set whenever the GPIB board detects the Local Lockout (LLO) message

has been sent either by the GPIB board or another Controller. LOK is cleared

when the Remote Enable (REN) GPIB line becomes unasserted by the system

controller.

REM Remote State. If this bit = 1, the GPIB Interface Board is in the remote state

(i.e, the REN line has been asserted and the Board has been addressed as a

listener.). This bit is cleared when one of the following occurs:

• REN is unasserted.

• The GPIB Interface Board has been addressed as a

Listener and receives a GTL (Go to Local)

command.

•

IBLOC is called while the LOK bit = 0.

CIC Controller-In-Charge. If this bit = 1, it indicates that the GPIB Interface Board

is the Active Controller. This bit is set upon the following conditions:

• If the board is the system controller and

ibsic or

SendIFC is executed.

• Control is passed to the GPIB Interface Board.

• This bit is cleared whenever the GPIB board

detects Interface Clear (IFC) from the system

controller, or when the GPIB board passes control

to another device.

AT N Attention. If this bit = 1, ATN is asserted. Likewise, if this bit = 0, the ATN line

is unasserted.

Table B-1. Bit Definitions (Continued)

Bit Description

1 2 ... 100 101 102 103 104 105 106 107 108 109 110 ... 115 116

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