Rohde & Schwarz CMW500 Series, Руководство пользователя

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Remote Control
R&S
®
CMW500
125 User Manual 1173.9463.02 ─ 02
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Via VXI-11 protocol: &NREN message
6.1.5 Multiple Channels for Remote Access
Several remote channels can be used simultaneously. The R&S CMW500 supports up
to four parallel channels. No restriction is placed upon the combination of channels: It is
possible to combine several channels of the same type (e.g. two GPIB channels), or
channels of different types (e.g. a USB channel and a LAN channel using the VXI-11
protocol).
The channels can address the same sub-instrument or different sub-instruments, see
also
Sub-Instruments .
Example:
Suppose you are executing a remote script to perform a relatively time-consuming mea-
surement, and that you wish to query the instrument state while the measurement is
running. You can do this without changing your script if you open a second remote chan-
nel for status register handling and monitoring; see
Status Registers for Different Chan-
nels .
The following remote control resources are channel-specific:
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Error Queue
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Input and output buffer
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All programmable parts of the status registers
Instrument settings and system resources
Instrument settings may affect several active remote channels. You should be particularly
cautious in using scripts containing reset (*RST), save (*SAV) or recall (*RCL) com-
mands, as a sudden change of the instrument settings may impair processes controlled
through other channels.
Please also keep in mind that processes controlled through different remote channels
may still share the same instrument resources, see
Resource and Path Management .
6.1.5.1 Status Registers for Different Channels
Each status register consists of five different parts:
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The CONDition parts of the lowest-level registers are continuously updated by the
instrument. These register parts are not programmable; they are an instrument
resource which is shared by all remote channels.
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The PTRansition and NTRansiton parts, the EVENt parts, and the ENABle parts
determine how the CONDition bits from the lower-level registers are passed on to
higher registers. These status register parts can be programmed individually for each
remote channel.
Remote Control Operation