R&S SMJ100A, Operating Manual

Page: 460 / 874

Remote Control Basics
R&S
®
SMJ100A
444 Operating Manual 1403.7458.32 ─ 14
Socket connections are established on a specially defined port. The socket address is
a combination of the IP address or the host name of the instrument and the number of
the port configured for remote-control. All R&S
SMJ use port number 5025 for this pur-
pose. The port is configured for communication on a command-to-command basis and
for remote control from a program.
6.1.3.4 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.
&GTL 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.)
&GTR 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
&GTR
.)
&POL Serial Poll Starts a serial poll.
6.1.4 GPIB Interface (IEC/IEEE Bus Interface)
To be able to control the instrument via the GPIB bus, the instrument and the controller
must be linked by a GPIB bus cable. A GPIB bus card, the card drivers and the pro-
gram libraries for the programming language used must be provided in the controller.
The controller must address the instrument with the GPIB bus address (see
Chap-
ter 6.1.4.2, "GPIB Instrument Address" , on page 446).
Characteristics
The GPIB interface is described by the following characteristics:
●
Up to 15 instruments can be connected
●
The total cable length is restricted to a maximum of 15 m; the cable length between
two instruments should not exceed 2m.
Remote Control Interfaces and Protocols