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Monochromator Wavelength Movement Commands
GOTO
Goes to a destination wavelength at maximum motor speed. Accepts
destination wavelength in nm as a floating point number with up to 4
digits after the decimal point or whole number wavelength with no
decimal point.
<GOTO>
Same as GOTO (For compatibility with software written for previous Acton
models.)
NM
Goes to a destination wavelength at constant nm/min rate specified by
last NM/MIN command. Accepts destination wavelength in nm as a
floating point number with up to 4 digits after the decimal point or
whole number wavelength with no decimal point.
<NM>
Same as NM (For compatibility with software written for previous Acton
models.)
>NM
Similar to NM except it returns control to user immediately rather than
waiting for Completion of monochromator wavelength move. Can be
used with? NM or MONO-?DONE below. This command must be
terminated with MONO-STOP listed below. NOTE: Use the NM
command when communication with the monochromator during the
scan is not required.
?NM
Returns present wavelength in nm to 0.01 nm resolution with units nm
appended. e.g. ?NM 300.00 nm
MONO-?DONE
Used with >NM command to determine if monochromator has reached
the destination. Returns 0 if move is not complete, 1 if move is
complete.
MONO-STOP
Stops the monochromator wavelength move after use of the >NM
command.
NM/MIN
Sets constant scan rate in nm/min to 0.01 nm/min resolution. e.g. 10.0
NM/MIN
?NM/MIN
Returns present scan rate in nm/min to 0.01 nm/min resolution with
units nm/min appended. e.g. ?NM/MIN 100.00 nm/min
Grating Control Commands:
NOTE: These Grating Control Commands are used for all Acton series Monochromators. The
VM-502 has a limited selection of concave gratings. When manually changing gratings, it is
necessary to also select the grating number in Monochromator Control software,
SpectraSense, or WinSpec to allow the correct grating parameters to be used.
GRATING
Recalls parameters for the specified grating from non-volatile memory.
Up to nine (9) gratings are allowed. This command takes a grating
number from 1 - 9. e.g. 3 GRATING
?GRATING
Returns the number of the grating presently being used numbered 1-9.
?GRATINGS
Returns the list of installed gratings with position, groove density and
blaze. The present grating is specified with an arrow.