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40 IsoPlane
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SCT 320 Manual Version 1.B
Parameters, if needed, precede the command and are separated from the command by at least one
space (e.g., 546.07 GOTO).
For RS-232 operation, the port set-up is 9600 baud, 8 data bits, 1 stop bit and no parity. A convenient
tool for trying out this mode of operation is the program HyperTerminal supplied with the Windows
operating system. The USB 1.1 port with the driver supplied also shows up as and is treated like a
com port – although a very fast one. All commands or strings of commands must be terminated with
a carriage return (0D hex). The spectrograph responds to a command when the command has been
completed by returning the characters OK followed by carriage return and line feed (hex ASCII
sequence 20 6F 6B 0D 0A). The default condition is to echo each character that is sent to the
spectrograph with the RS-232 interface and to not echo the commands when using the USB
interface. When sending a command or string of commands, it is important to wait for the
spectrograph to complete the processing of that command string before sending another command.
A.4.1 Spectrograph 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 3
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 SP series 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 3 digits after the decimal point or whole number
wavelength with no decimal point.
<NM> Same as NM (For compatibility with software written for Acton SP series
models.)
>NM Similar to NM except it returns control to user immediately rather than
waiting for completion of spectrograph 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 0.01nm 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 the scan rate in nm/min to 0.01 nm/min resolution with units nm/min.
?NM/MIN Returns present scan rate in nm/min to 0.01 nm/min resolution with units
nm/min.