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1- 8 Agilent B2900 SCPI Command Reference, Edition 2

Programming Basics

SCPI Messages

Numeric Suffix

All command headers can be accompanied by a numeric suffix for differentiating

multiple instances of the same structure, i.e. for multi-channel instruments. The

numeric suffix can be appended to both long and short forms. For example, TRIG1

is the short form of TRIGger1. A numeric suffix of 1 is implied on all command

headers that do not explicitly define a suffix; thus, TRIG is equivalent to TRIG1.

For B2900 SCPI commands, some commands have a numeric suffix for classifying

the channels, the limit tests, the Digital I/O pins, etc. The numeric suffix is an

optional character, and can be expressed by [c], [d], [h], [m], and [n], where:

c is the integer 1 or 2, used to specify the channel 1 or 2, respectively.

d is the integer 1 or 2, used to specify the upper half or lower half, respectively, of

the display area on the front panel display.

h is an integer between 1 and 100, used to specify a variable used in the program

memory.

m is an integer between 1 and 12, used to specify a limit test.

n is an integer between 1 and 14, used to specify a Digital I/O pin.

For example, the :CALCulate[c]:LIMit[m]:STATe command allows you to enter c

between :CALCulate and :LIMit, and m between :LIMit and :STATe.

Abbreviating the numeric suffix gives the same result as specifying 1.

Channel List Parameter

The channel list parameter is used for identifying the channel number as well as the

numeric suffix.

The notation (@1,2) specifies a channel list that includes channels 1 and 2.

The notation (@1:2) specifies a channel list that includes channels 1 to 2.

In the B2900 SCPI commands, the channel list parameter is only available on

certain commands which requires synchronization of channels (e.g. some

commands of the

TRIGger Subsystem) or specification of the channel itself (e.g.

some commands of the MMEMory Subsystem).

The channel list parameter is also used for identifying the grouped channels defined

by the

:SYSTem:GROup[:DEFine] command for performing synchronous channel

operations.

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Agilent Technologies B2902 Manuale di Servizio Pagina 24