PerkinElmer LS 55, User Manual

Page: 127 / 202

RS232 Commands . 127
Monochromator Drive
The monochromators may be driven in one of two modes:
In Scan mode, either or both monochromators may be driven between specified
limits. If both monochromators are driven, the excitation monochromator is driven
at the specified constant wavelength speed and the emission monochromator either
a constant wavelength or constant frequency offset from the excitation
monochromator. If a single monochromator is driven, then it is at the specified
wavelength speed.
The Scan start is synchronized to a mains cycle. Velocity may be 10 to
1500 nm/min or -10 to -1500 nm/min. Limits are specified for each
monochromator and must in the range 200 to 800 nm for excitation, and 200 to
900 nm for emission. Wavelengths are a multiple of 0.1 nm. Scanning is in the
direction specified by the sign of the scan velocity. A scan ends when one of the
monochromators encounters its end limit or on an abort request.
In GOTO mode either monochromator is driven as fast as possible in the specified
direction. Destination wavelengths must either be 0 nm or within the scan limits
above. Unless an excitation polariser or blank position has been selected or a fast
filter excitation unit is fitted, the excitation filter is selected according to the
excitation monochromator destination. For excitation wavelengths <410 nm, a
clear (no filter) position is selected, otherwise a 350 nm cutoff filter is used. A
GOTO ends when the monochromator and excitation filter is at its destination, or
when abort is requested.
Plate Reader Driver
The plate reader may be used as a well plate reader or as a TLC plate reader. In
TLC plate reader mode the motors may be moved either in Scan or GOTO modes
but in well plate mode only GOTO mode is available.
Positions are specified in units of 0.1 nm in the TLC plate reader case and as
sample positions (1-96) in the well plate case.
In Scan mode the limits are 0 to 99.0 mm for the x-axis and 0 to 63.0 nm for the
y-axis. The scan is in the direction specified by the sign of the speed.