PerkinElmer LS 55, User Manual

Page: 134 / 202

134 . LS 55 User’s Guide
Command: MONOCHROMATOR SELECTION
Syntax: $MX code
Description: Sets specified monochromator selection for subsequent scans:
Code = 0 Excitation only, 1 Emission only, 2 Both. Returns error
0111 if emission or both selected with emission mirror in.
Power-on default is 0.
Command: SCAN
Syntax: $SC start type
Description: Starts a scan according to start type (1 = immediate; 2=after
START event detected). If the first error code indicated no error
then a scan status record is sent. The monochromators are
driven to the start positions specified by $AL, $AH, $SS and $MX
commands.
Data records are then sent as data become available. An error
code is sent on completion of the scan. A data record consists of
10 successive output points. A last record is padded with
representations of the value -9999 and contains at least one of
these. A data record is transmitted either in ASCII or binary. In
ASCII mode points are separated with commas. In binary mode a
4 byte representation is sent with the least significant bytes
foremost. Each real output value is an integer in the range -5000
to +999999 ('+' sign suppressed) and is derived from the data
available in the data processing chain multiplied by the scale
factor and truncated to integer. A data point appended with an
exclamation mark (!) indicates that an event was detected during
its collection.
A scan status record consists of the following:
55.<rev>,<ms><mq><dc><fi>,<ex.wavelength>, <em.slit
width>, <max.points>,<data.int>.
Fields within the record separated by commas are of fixed length
and are left-filled with spaces. Parameters in angle brackets are
substituted as follows (x = ASCH digit, space, or minus):
<rev> is 2 character integer representing software revision. The
first character corresponds to the software release number.