Boonton 4240 RF Power Meter Manual do Utilizador descarregar pdf (Página 62)

Boonton 4240 Series RF Power Meter

Additionally, the ASCII "DC2" character (hexadecimal 12/CTRL R) will cause the instrument to immediately transmit data

base Continuing the ab

ER>

R/hexadecimal 12) .

dBm.

The nd data strings are the sam form and data

strin itive.

5.3 SCPI Language

The mote standard SCPI

rogramming conventions. The default language is:

ll of the functions of the 4240 Series are accessible remotely via SCPI commands.

he SCP mand nodes”. Each node may contain

mands xt-level command node. rmed of a series of keywords joined together, and

elimited racter. The command be e “root node”, and traverses downwards through

specific command. Thi lar to a DOS file system, where the file system

h directory (SCP ain a list of files (SCPI commands) and lower-

individual comma d name (“path”) must generally be speficied,

tcuts available to reduc string length.

CPI su i andard provides a number of

-define be used for most in ple, the top level SENSe subsystem groups

omman ensing signals (de igitization, linearization), while the OUTPut

bsyste tput fu output or controlling an RF

rence

5.3.2 Long and Short Form Keywords

Each command or subsystem may be represented by rd, or a short form of that keyword. The short form

forms are permitted – intermediate length commands will

s a

Certain subsys ms, such a the SE or CALCulate subsystems in the 4240 Series, often exist as more than one instance

(often called a “channel” in an instrument). In this case, an optional numeric suffix may be used to define the channel. If this

d on the current talk mode. ove example:

Terminal Sends Model 4240 Response

TM0 <ENT Set the talk mode to send Floating Point Measurements.

R (CTRL Talk the error flag and the measurement in floating point notation

Data returned: “0,-3.00” - indicating no error and the power is -3

rules for number a e as for the IEEE-488 interface. Number formats are free

gs are case insens

4240 Series instruments may be re ly controlled using commands that follow the industry-

SYSTem:LANGuage SCPI

5.3.1 SCPI Structure

T I instrument model defines a hierarchical command structure based on “com

com or names of a ne Each command is fo

d by a colon “:” cha gins with a colon at th

the command tree to form a s structure is very simi

begins at the root level (“:”), and eac I subsystem) may cont

level directories. To execute an nd, the entire comman

although there are several shor e the command

S bsystems or command groups are usually al gned with instrument functions, and the st

pre d subsystems that can strument types. For exam

c ds that are related to s tection, amplification, d

su m contains commands that control ou nctions of the instrument such as voltage

refe output.

either its full keywo

is typically the first several characters of the full name, although this is not necessarily the case. The short form of each

keyword is identified in this manual by the keyword characters shown in UPPERCASE, while the long form will be shown in

mixed case. For example, the short form of “CALCulate” is “calc”, while the long form is “calculate”. Long form and short

form commands may be used interchangeably, but only the exact

not be recognized. Sending “CALCUL” will cause an error.

Note that not all keywords have long forms – in this case, the entire keyword will be shown in uppercase.

While uppercase and lowercase text is used to identify keywords, SCPI is generally case-insensitive, so it is acceptable to

send uppercase, lowercase or mixed case keywords to the instrument. The only exception is when a command accept

literal string argument. In this case, quotes may be used to delimit a string of user-defined case.

5.3.3 Subsystem Numeric Suffixes

te s NSe

Remote Operation

5-2

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