Network and Remote Operation
R&S
®
FSPN
251
User Manual 1179.4363.02 ─ 01
Universal Commands
Universal commands are encoded in the range 10 through 1F hex. They affect all
instruments connected to the bus and do not require addressing.
Command
Effect on the instrument
DCL (Device Clear)
Aborts the processing of the commands just received and sets the com-
mand processing software to a defined initial state. Does not change the
instrument settings.
IFC (Interface Clear) *)
Resets the interfaces to the default setting.
LLO (Local Lockout)
The "Local" softkey is disabled. Manual operation is no longer available
until
GTL
is executed.
SPE (Serial Poll Enable)
Ready for serial poll.
SPD (Serial Poll Disable)
End of serial poll.
PPU (Parallel Poll Unconfig-
ure)
End of the parallel-poll state.
*) IFC is not a real universal command, it is sent via a separate line; however, it also affects all instruments
connected to the bus and does not require addressing
Addressed Commands
Addressed commands are encoded in the range 00 through 0F hex. They only affect
instruments addressed as listeners.
Command
Effect on the instrument
GET (Group Execute Trigger)
Triggers a previously active instrument function (e.g. 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)
Transition to the "local" state (manual control).
GTR (Go to Remote)
Transition to the "remote" state (remote control).
PPC (Parallel Poll Configure)
Configures the instrument for parallel poll.
SDC (Selected Device Clear)
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.
10.1.2
SCPI (Standard Commands for Programmable Instruments)
SCPI commands - messages - are used for remote control. Commands that are not
taken from the SCPI standard follow the SCPI syntax rules. The R&S
FSPN supports
the SCPI version 1999. The SCPI standard is based on standard IEEE 488.2 and aims
at the standardization of device-specific commands, error handling and the status reg-
isters. The tutorial "Automatic Measurement Control - A tutorial on SCPI and IEEE
488.2" from John M. Pieper (R&S order number 0002.3536.00) offers detailed informa-
tion on concepts and definitions of SCPI.
Remote Control Basics