PerkinElmer LS 55, User Manual

Page: 133 / 202

RS232 Commands . 133
Monochromator Scan Control Commands
Command: ABSCISSA HIGH LIMIT
Syntax: $AH <abscissa limit>
Description: Sets either a new emission or excitation high abscissa limit
depending on monochromator selection. Emission limit must be in
range 200.0 to 900.0. Excitation limit must be in range 200.0 to
800.0. Limits are rounded to nearest 0.1 and are in units of wn.
A high limit must be greater than the corresponding low limit.
Power-on defaults for high limits are: 800 for excitation and 900
for emission. Returns high limit for selected monochromator if no
parameter is specified.
NOTE: Excitation limit is set if monochromator selection is 'both'. Refer to
command $MX.
Command: ABSCISSA LOW LIMIT
Syntax: $AL <abscissa limit>
Description: As for high limit. Power-on defaults for low limits are 200 for
both. Returns low limit for selected monochromator if parameter
is not specified.
Command: MONOCHROMATOR SELECTION QUALIFICATION
Syntax: $MQ qualifier
Description: Causes subsequent scans of both monochromators to be
'constant wavelength' if qualifier = 0, or 'constant frequency' if
qualifier =1. Qualifier must be integer. Power-on default is 0.