Reference Information for Remote Control
R&S
®
SMA100B
509
User Manual 1178.3834.02 ─ 03
–
Instrument control commands
refer to functions depending on the features of
the instrument such as frequency settings. Many of these commands have also
been standardized by the SCPI committee. These commands are marked as
"SCPI confirmed" in the command reference chapters. Commands without this
SCPI label are device-specific; however, their syntax follows SCPI rules as per-
mitted by the standard.
Instrument responses
Instrument responses (response messages and service requests) are messages the
instrument sends to the controller after a query. They can contain measurement
results, instrument settings and information on the instrument status.
A.1.2 LAN Interface Messages
In the LAN connection, the interface messages are called low–level control messages.
These messages can be used to emulate interface messages of the GPIB bus.
Command
Long term
Effect on the instrument
&ABO
Abort
Aborts processing of the commands just received.
&DCL
Device Clear
Aborts processing of the commands just received and
sets the command processing software to a defined initial
state. Does not change the instrument setting.
>L
Go to Local
Transition to the "local" state (manual control). (The
instrument automatically returns to remote state when a
remote command is sent UNLESS
&NREN
was sent
before.)
>R
Go to Remote
Enables automatic transition from local state to remote
state by a subsequent remote command (after
&NREN
was sent).
&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.
&LLO
Local Lockout
Disables transition from remote control to manual control
by means of the front panel keys.
&NREN
Not Remote Enable
Disables automatic transition from local state to remote
state by a subsequent remote command. (To re-activate
automatic transition use
>R
.)
&POL
Serial Poll
Starts a serial poll.
A.1.3 SCPI Command Structure
SCPI commands consist of a header and, in most cases, one or more parameters. The
header and the parameters are separated by a "white space" (ASCII code 0 to 9, 11 to
32 decimal, e.g. blank). The headers may consist of several mnemonics (keywords).
Queries are formed by appending a question mark directly to the header.
Additional Basics on Remote Control
