Computer Interface, Commands, and Data Collection

Teledyne API Ultrafine Particle Monitor - Model 651

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.

C o m m a n d s

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".

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Teledyne 651 operation manual M m a n d s, Read, Set