Operating instructions

R&S ESCI Instrument Interfaces
1166.6004.12 8.5 E-1
Interface Messages
Interface messages are transferred on the data lines of the IEC Bus when the "ATN" control line is
active (LOW). They are used for communication between controller and instruments and can only be
sent by the controller which currently has control of the IEC Bus.
Universal Commands
The universal commands are encoded 10 - 1F hex. They affect all instruments connected to the bus
without addressing.
Table 8-3 Universal Commands
Command QuickBASIC command Effect on the instrument
DCL (Device Clear) IBCMD (controller%, CHR$(20)) Aborts the processing of the commands just
received and sets the command processing
software to a defined initial state. Does not change
the instrument settings.
IFC (Interface Clear) IBSIC (controller%) Resets the interfaces to the default setting.
LLO (Local Lockout) IBCMD (controller%, CHR$(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 state.
Addressed Commands
The addressed commands are encoded 00 - 0F hex. They are only effective for instruments addressed
as listeners.
Table 8-4 Addressed Commands
Command QuickBASIC command 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.
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. Additionally,
the QuickBASIC command executes PPE/PPD.
Instrument Messages
Instrument messages are transferred on the data lines of the IEC bus when the "ATN" control line is not
active. ASCII code is used.
Structure and syntax of the instrument messages are described in Chapter 5. The commands are listed
and explained in detail in Chapter 6.