R&S
®
CMW 500 Remote Control
Remote Control Operation
Operating Manual 1202.3986.32 – 03 69
Interface Protocols, VISA
*)
resource string
Remarks
USB USB[board]::2733::
87::serial
number[::USB
interface
number][::INSTR]
USB connectors are located on the front and on the rear panel of
the instrument.
2733 (0xAAD) is the manufacturer ID of Rohde & Schwarz
87 (0x57) is the R&S CMW 500 model code
the serial number is device-specific.
GPIB GPIB[board]::primar
y address[::INSTR]
(no secondary
addr
ess)
Two optional GPIB bus interfaces according to standard IEC
625.1/IEEE 488.1 (options R&S CMW-B612A and R&S CMW-
B612B). The GPIB bus connectors for connection to a controller
are located on the rear panel of the instrument.
For a description of the interface and interface commands refer
to GPIB Bus Interface.
*) VISA is a standardized software interface library providing input and output functions
to communicate with instruments. The I/O channel (LAN or TCP/IP, USB, GPIB, ...) is
selected at initialization time by means of the channel–specific resource string (also
termed address string) quoted above or by an appropriately defined VISA alias (short
name). A VISA installation is a prerequisite for remote control over LAN or
USB interface. All VISA address resource strings are displayed and defined in the
Setup dialog.
For more information about VISA refer to the user documentation.
LAN Connection
The R&S CMW 500 provides two LAN connectors for direct connection to a Local Area
Network. Remote control via LAN requires a VISA installation but no additional
hardware at the controller. VISA provides the TCPIP interface type and several
protocol types to communicate with LAN-connected devices. For a simple example see
Establishing and Testing a LAN Connection.
USB connection
A USB connection requires the VISA library to be installed. VISA will detect and
configure the R&S CMW 500 automatically when it is plugged to the computer. No
separate driver installation is necessary.
SCPI (Standard Commands for Programmable Instruments) commands – instrument-
control commands – are used for remote control.
SCPI Compatibility
The SCPI standard (Standard Commands for Programmable Instruments) is based on
standard IEEE 488.2 and aims at the standardization of device-specific commands,
error handling and the status registers. The R&S CMW 500 is compatible to the final
SCPI version 1999.0.
SCPI-confirmed commands are explicitly marked in the command reference chapters.
Commands without SCPI label are device-specific, however, their syntax follows SCPI
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