1250 Frequency Response Analyzer The RS423 and GPIB Ports. Remote Control
AMK/1250/4 13-9
13.7 1250 COMMAND CODES
13.7.1 INTRODUCTION
The Command language is based on the 1250 Front Panel operations. Each Command
consists of a simple string of ASCII alpha-numeric characters whose significance
parallels the hardkey-softkey arrangement. The numeric part of a Command can be in
fixed point or floating point (exponential) format. The Command Codes are identical for
RS423 or GPIB operation.
13.7.2 COMMAND CODE FORMAT
The Command Codes usually take the form of a two-letter prefix, followed by a
numerical argument, i.e. a number.
Prefix. Where possible, the two letters abbreviate the name of the parameter to be
commanded, e.g. FR for Frequency. Some of the Learnt Program Codes use asterisk
plus letter rather than two letters, and certain Codes which are used only for queries are
themselves prefixed by a question mark. Further use of the question mark with other
Command Codes is described in Section 13.9 "Command Query".
Argument. The argument, abbreviated to ARG in the following lists (Sections 13.7.3 to
13.7.19), can take several forms:
1. F i.e. Floating Point, where, for example 1E5 = 1 X 10
5
2. I i.e. an Integer of up to 2 digits.
3. I, I i.e. two Integers of up to 2 digits each. An example is Analyzer Range, which
requires that the Channel Number be specified as the first Integer, followed by the
second Integer indicating the required Range for that Channel. The comma
separator must be included between the two Integers.
A special form of double Integer Argument is used where several Command Codes
have a common prefix, e.g. FN for Function can be followed by 1, I etc. In this case
the fixed Integer 1 selects the specific parameter, e.g. Angle Range and the variable
Integer selects the required Range e.g. "- to +".
4. D i.e. an Integer of up to 4 digits. One application of this is in Point-to-Point
measurements where it is necessary to specify two sources e.g. SO 0102 means
"use Channel 1 divided by Channel 2 as the Display Source".
5. n i.e. a number as specified in the adjacent "Meaning" column.
6. none e.g. Stop Codes, which have no Argument.
Separators. No separators are required between individual characters in a Command,
unless a double Integer is involved, in which case the two Integers must be separated by
a comma.
Max and Min. These two columns give, where applicable, the upper and lower values
that can be entered as the Argument part of the Code.
Init. This column shows the Initialised, or default state for each Command. The
Argument usually has a default value of zero but the Display shows "not entered",
abbreviated to "n.e." in the Code list. Where "none" appears, this indicates that there is
no meaningful default state.
To Next Page
Loading...
