LAMBDA DG-4 & 5 PLUS/USB OPERATION MANUAL – REV.
35
4.
EXTERNAL CONTROL OPERATIONS
The following interfaces are provided over which the Lambda DG-4/5 Plus/USB can be
externally controlled using a common command set:
1.
Parallel (PC style 25-pin )
2.
Serial (RS-232 9-pin)
3.
USB (with a combined device driver package offering two modes of operation: USB direct
or virtual serial)
The parallel port provides you with the fastest remote interface possible. The serial port
connection provides you with a similar range of commands but at a significantly slower
speed. A serial interface therefore will not fully exploit the Lambda DG-4’s rapid filter
changing capability. Remote control of the Lambda DG-4 is similar to that of the Sutter
Lambda 10 filter wheel but functional differences in these units require the elimination of
some commands and the addition of others. All of the commands are byte (8-bit) values. This
corresponds to a single character from the serial port or the value encoded by the eight logic
level input lines of the parallel port.
Serial and Parallel Ports: Refer to the main Lambda DG-4/5 operation manual for
descriptions on how to externally-control the instrument using the serial (RS-232, 9-pin
DSUB connector) interface or the Parallel port (PC-style printer port, 25-pin DSUB
connector).
USB Interface: While the serial and parallel interfaces are selectable between them as in
earlier models of the DG-4/5, the “Plus/USB” version of the instrument adds the USB port
and is selectable in the same way.
The USB device driver for Windows is downloadable from Sutter Instrument’s web site
). The Lambda DG-4/5 Plus/USB requires USB CDM (Combined Driver
Model) Version 2.10.00 or higher. The CDM device driver for the Lambda DG-4/5 Plus/USB
consists of two device drivers: 1) USB device driver, and 2) VCP (Virtual COM Port) device
driver. Install the USB device driver first, followed by the VCP device driver. The VCP device
driver provides a serial RS-232 I/O interface between a Windows application and the Lambda
DG-4/5 Plus/USB. Although the VCP device driver is optional, its installation is
recommended even if it is not going to be used. Once installed, the VCP can be enabled or
disabled.
The CDM device driver package provides two I/O methodologies over which communications
with the Lambda DG-4/5 Plus/USB can be conducted: 1). USB Direct, or 2). Serial RS-232
asynchronous via the VCP device driver. The first method requires that the VCP device
driver be disabled (or not installed). The second method requires that the VCP be installed
and enabled.
Virtual COM Port (VCP) Serial Port Settings: The following table lists the required RS-232
serial settings for the COM port (COM3, COM5, etc.) generated by the installation of the
VCP device driver.
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