The Command Line

In this section a list of the most important AU commands shall be given. It is not intended to be complete in any respect, but it will help a lot in the every-day use of SeveNMR. A complete list with some short explanations can be obtained by typing the command HELPon the command line.

variable value	Sets the corresponding variable to the given value. If no units are specified it assumes durations to be given in seconds, voltages to be given in [V], frequencies to be given in [kHz] and magnetic fields to be given in [kG]. Attention: Too long pulses may damage the power amplifier!
ZG	Starts the pulse card and the data acquisition after having deleted the old content of the real time chart. ZG makes as many averages as specified by the environement variable NS.
GS	Similar to ZG. But with infinite number of pulses. All duration parameters can be changed on line. This command is implemented to help with the tuning and the signal optimization.
WR filename	Writes the content of the real time chart to the file specified. Example: WR FID 3 writes it to FID003.DAT.
DW	Sets the dwell time.
TD	Sets the number of points. It is limited to 1024 but since the card allows many more, we will change the program soon.
GAIN	Sets the gain of the scope board. There are 6 ranges available: A: 100mV; B: 200mV; C: 500mV; D: 1V; E: 2V; F: 5V.
PPE	Starts the pulse program editor -- a very simple ASCII editor -- with the file specified.
RP	Reads a pulse program, sends it to the compiler to translate it to the Forth language and installs it in the pulse card.
EDIT	Starts the AU script editor with the file specified.
AU	Starts an AU script.
GOSUB label .... RETURN	Does the same as GOSUB does in Fortran or Basic: it calls a subprogram.
IF condition	If the condition is not fulfilled the next line in the AU script will be skipped.
END	Every AU program has to end with it.
ADDS	Glues two strings together.
ADDI	Adds two integers.
ADDR	Adds two reals.
MUL	Multiplies two reals.
ENABLE device ON/OFF	Switches a device on or off. Since SeveNMR is intended to work together with a magnet with persistent mode it is expecting us to switch the heater on before we sweep the magnet. Therefore we have to begin a sweep with ENABLE CURRENT ON. If we don't the program will ask us by a dialog box if we are sure about what we are doing.
SWEEP [-] field	Sweeps the field to a given value. The value of the magnet current is stored in the memory. If the computer crashes or SeveNMR is quitted, this value goes lost and the memory value does not anymore equal the HP value. Therefore SeveNMR will refuse to sweep for security reasons to prevent a quench. Before it will react to our command we have to set the memory value to the HP value. This can be done in setting - in front of the field value.
SETFR	Sets the frequency.
HELP	Posts a complete list with all commands and a short explanation.
STOP ZG/AU/GS/WAIT/TE	Stops the given process.
SHOW	Shows all variable values or only the one specified
HB	Sets the horizontal time base of the real time chart. Equivalent to the menu selection.
VB	Sets the vertical voltage base of the real time chart. Equivalent to the menu selection.