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Computer Interface, Commands, and Data Collection Teledyne API Ultrafine Particle Monitor - Model 651
74 07506C DCN6727
Model 651 in the terminal emulation software. This is because,
although the Model 651 and computer are communicating, the
command is not understood. You can ignore this error message – it
is only used for testing the connectivity. When data is being
reported to the screen of the terminal emulation software, you can
either, cut and paste the data into a file, or use the software’s data
logging capabilities to capture data. Data in the comma-delimited
format can be imported into programs such as Microsoft Excel
®
spreadsheet software for analysis and graphing.
Appendix B, “Firmware Commands
” describes the commands that
control the operation and data reporting options for the Model 651
instrument.
Commands
It is important to note the following information about the
commands and responses:
Unless specified as binary-encoded, all commands and
responses are sent or received as ASCII characters.
All messages are terminated with a <CR> (0x0D) character.
All linefeed (0x0A) characters are ignored and none are
transmitted.
Commands are case insensitive. The backspace character
(0x08) deletes previous characters in buffer.
Values enclosed by “<>” indicate ASCII characters/values
sent/received. For example, <,> indicates the comma was sent
or received via the communications channel.
The firmware commands are divided into the categories described
below.
Commands Description
READ
Used to read parameters from the instrument (such
as flow rate, pressure, temperature, etc.). READ
commands can be identified by a leading "R".
SET Set an internal parameter to the value(s) supplied
with the command (supplied parameters are
always delimited by a comma). SET commands
can be identified by a leading "S". The instrument
will reply to all SET commands with the string
"OK"<CR>.
Note: When the instrument does not understand a command, it
replies with the string "ERROR".