SME IEC/IEEE Bus Interface
1038.6002.02 6A.3 E-12
Interface Messages
Interface messages are transmitted to the instrument on the data lines, with the attention line being
active (LOW). They serve to communicate between instrument and controller.
Universal Commands
The universal commands are encoded in the range 10 through 1F hex. They are effective for all
instruments connected to the bus without addressing them before.
Table A- 2 Universal Commands
Command QuickBASIC commandl Effect on the instrument
DCL (Device Clear) IBCMD (controller%, CHR$(20)) Aborts the processing of the commands just received
and sets the command processing software to a
defined initial state. Does not change the instrument
setting.
IFC (Interface Clear) IBSIC (controller%) Resets the interfaces to the default setting.
LLO (Local Lockout) IBCMD (controller%, CHR$(17)) The LOC/IEC ADDR key is disabled.
SPE (Serial Poll Enable) IBCMD (controller%, CHR$(24)) Ready for serial poll
SPD (Serial Poll Disable) IBCMD (controller%, CHR$(25)) End of serial poll
PPU Parallel Poll Unconfigure) IBCMD (controller%, CHR$(21)) End of the parallel-poll polling state
Addressed Commands
The addressed commands are encoded in the range 00 through 0F hex. They are only effective for
instruments addressed as listeners.
Table A- 3 Addressed Commands
Command QuickBASIC commandl Effect on the instrument
SDC (Selected Device
Clear)
IBCLR (device%) Aborts the processing of the commands just received
and sets the command processing software to a
defined initial state. Does not change the instrument
setting.
GET (Group Execute
Trigger)
IBTRG (device%) Triggers a previously active device function (eg a
sweep). The effect of the command is the same as
with that of a pulse at the external trigger signal input.
GTL (Go to Local) IBLOC (device%) Transition to the "Local" state (manual control)
PPC (Parallel Poll
Configure)
IBPPC (device%, data%) Configure instrument for parallel poll. The
QuickBASIC command additionally executes PPE /
PPD.
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