Agilent Technologies B2902 Service Manual download pdf (Page 21)

Agilent B2900 SCPI Command Reference, Edition 2 1- 5

Programming Basics

SCPI Commands

Including Common Commands

You can combine common commands and subsystem commands into a single

message. Treat the common command as a message unit by separating it with a

semicolon (the message unit separator). Common commands do not affect the

header path; you may insert them anywhere in the message.

OUTPut OFF;*RCL 1;OUTPut ON

Using Queries

Observe the following precautions when using queries.

• Add a blank space between the query indicator (?) and any subsequent

parameter such as a channel list.

• Allocate a proper number of variables for the returned data.

• Read back all the results of a query before sending another command to the

instrument. Otherwise, a Query Interrupted error will occur and the unreturned

data will be lost.

Coupled Commands

When commands are coupled, it means that the value sent by one command is

affected by the settings of another command. The following commands are coupled:

[SOURce:]CURRent and [SOURce:]CURRent:RANGe

[SOURce:]VOLTage and [SOURce:]VOLTage:RANGe

If a range command is sent to place an output into a range with a lower maximum

setting than the present level, an error is generated. This also occurs if a level is

programmed with a value too large for the present range.

These types of errors can be avoided by sending both level and range commands as

a set, within the same SCPI message. For example,

VOLTage 10;VOLTage:RANGe 10<NL>

will always be correct because the commands are not executed until the message

terminator is received. Because the range and setting information is received as a

set, no range/setting conflict occurs.

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Agilent Technologies B2902 Service Manual Page 21