Sequoia LISST-200X, Руководство пользователя

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LISST-
200X User’s Manual
59 LISST-200X Operation Details
C.
Instrument Communication
Overview The cables Sequoia supplies with the LISST-200X send data through a
standard USB port. However, the LISST-200X itself communicates
through RS-232 serial protocol. The 5-pin male connector on the
LISST-200X carries the RS-232 signals (and power). The cables
incorporate adapters that convert between RS-232 and USB.
If you use a different cable that does not include the RS-232-to-USB
adapter, you can use an external adapter, or connect directly to an RS-
232 port if your computer has one (rare on any recent computer). In
Windows, both RS-232 and USB connections will appear as COM
ports.
If interfacing to a data logger or controller system other than a Windows
computer, you will likely also use a direct RS-232 connection.
The RS232 link communicates at 9600 baud, 8 data bits, No parity, and
1 stop bit. For offloading data files, the LISST-200X software uses
YMODEM protocol at 115K baud. The transfer rate can be changed in
the settings of the LISST-200X software. A slower speed may be
required when downloading data over cables longer than a few meters.
Using the LISST-
200X Terminal
Window In the LISST-200X software, you can open a terminal window to directly
view communications with the LISST-200X, and enter commands.
When the LISST-200X is connected and the terminal window is the
front window, the LISST-200X should respond to pressing the enter key
with the L200X:> prompt. If the instrument is in the deep sleep mode,
you can wake it by pressing the Stop button.
Direct
Commands In most cases, LISST-200X software will be used to configure and
operate the LISST-200X. However, some functions are available only
through direct commands in the terminal window. Also, in some
applications the LISST-200X may need to communicate to another
datalogger or custom program. For this purpose, a large set of
commands is available to operate the instrument. See the following
sections for detailed descriptions of each command.