LAMBDA DG-4 & 5 PLUS/USB OPERATION MANUAL – REV.
52
4.1.8
Shutter Control
The “shutter” is treated as a special FILTER POSITION whose Galvanometer values are
assigned to FILTER NUMBER 0. These values set the Galvanometers so that the light path
is interrupted, and, therefore act as a shutter when the FILTER NUMBER 0 is selected. The
shutter is effectively opened by selecting the desired FILTER NUMBER. If, however, in
writing a routine to control the DG-4 you wish to return to the last FILTER NUMBER used
but do not want to keep track of that value in your program, shuttering can be done using
the CLOSE SHUTTER and OPEN SHUTTER commands. OPEN SHUTTER will
automatically return the Galvanometers to whatever FILTER NUMBER was last selected
before being closed by the CLOSE SHUTTER command. The mechanical effect is the same
as selecting FILTER NUMBER 0 to close the shutter followed by the desired FILTER
NUMBER to open the shutter.
Table 4-11. Shutter open and close commands.
Command Tx/
-Rx
Ver.
Byte
Count
Byte
Offset
Value
Alt-
key-
pad
entry
Ctrl-
char
ASCII
def./-
char.
Description
Dec. Hex. Binary
Open
Shutter
Tx All
1
0
170 AA 1010 1010 0170
Moves the light path away from
Filter 0 (where the light is blocked)
to the filter position at which the
light path was positioned prior to
issuing the Close Shutter (172)
command.
Rx All
2
0
Echoed command sequence
1
13
0D 0000 1101
<CR>
Completion indicator
Close
Shutter
Tx All
1
0
172 AC 1010 1100 0172
Moves the light path from the
current filter position to Filter 0,
where the light is blocked. The
original filter position is stored so
that when the Open Shutter (170)
command is issued, the light path is
moved from Filter 0 back to the
original position.
Rx All
2
0
Echoed command sequence
1
13
0D 0000 1101
<CR>
Completion indicator
4.2
Serial Interface
4.2.1
Connecting to the Lambda DG-Series Serial Input
RS-232 serial control of the Lambda DG-4 is provided through a 9-pin connector on the rear
of the controller cabinet. Only the ground and the two data lines are connected: the hardware
control lines are not connected. This cable should not be used simultaneously with a parallel
port cable connected to the DG-4.
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