Quantum-composers 9250 Series Manuel d'utilisateur télécharger pdf (Page 33)

9250 Manual Version 1.2 | Quantum Composers

Line Termination

The pulse generator uses text-style line terminations. When a command is sent to the unit,

the firmware is programmed to read characters from a communication port until it reads the

line termination sequence.

The command string is parsed and executed after reading these characters. These

characters are the “carriage return” and “linefeed”. They are ASCII chara cter set values 13

and 10 respectively (hex 0x0D and 0x0A). All command strings need to have these

characters appended.

When the pulse generator responds to a command, whether it is a query or a parameter

change, it also appends its return strings with these characters. Coded applications could

use this behavior to know when to stop reading from the unit. However, if the “echo”

parameter is enabled, there will be two sets of line terminators, one following the echoed

command string, and one following the pulse generator’s response.

The pulse generator responds to every communication string. If the communication string is a

query, the unit responds with the queried response (or error code) followed by the line

terminators. If the communication string is a parameter change, the response is “ok” (or error

code) followed by the line terminators. For this reason, it is not recommended that multiple

commands be stacked together into single strings as is common with some other types of

instruments. It is recommended that the coded application send a single command in a string

and follow immediately by reading the response from the unit. Repeat this sequence for

multiple commands.

IEEE 488.2 Common Command Format

The IEEE 488.2 Common Commands control and manage generic system functions such as

reset, configuration storage and identification. Common commands always begin with the

asterisk (*) character and may include parameters. The parameters are separated from the

command pneumonic by a space character. For Example:

*RST <cr><lf>

*RCL 1 <cr><lf>

*IDN? <cr><lf>

SCPI Command Keywords

The commands are shown as a mixture of upper and lower case letters. The upper case letters

indicate the abbreviated spelling for the command. You may send either the abbreviated

version or the entire keyword. Upper and/or lower case characters are acceptable.

For example, if the command keyword is given as POLarity, then POL and POLARITY

are both acceptable forms; truncated forms such as POLAR will generate an error;

polarity, pol, and PolAriTy are all acceptable as the pulse generator is not case

sensitive.

*Note: The unit by default is not case sensitive.

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Quantum-composers 9250 Series Manuel d'utilisateur Page 33