CEL-712 Microdust Pro Real-time Dust Monitor
59 Casella Measurement
APPENDIX - Serial Communication Interface
11 Command set for remote control
The Microdust Pro instrument may be interrogated and controlled using a
simple serial communications protocol. A terminal emulation program, for
example Microsoft ‘HyperTerminal’ may be used to communicate with the
instrument.
The mini USB socket located on the base of instrument includes physical
connections for both USB connectivity and also RS232 level serial
communications. Access to the RS232 signal level connection pins may be
achieved using the cable assembly 206094B which provides a standard female
9 way D type RS232 connection.
In USB connected mode to a PC, the instrument supports ‘Mass Storage’ and
‘CDC Serial Communication’ device classes.
The RS232 hardware connection method is suited to the connection of non PC
based devices such as data loggers.
The RS232 baud rate may be selected in the ‘System tools’ menu from
1200 baud to 115k baud. The RS232 serial communication parameters are fixed
at using 8 data bits, 1 stop bit and no parity.
RS232 and USB serial communication methods should not be used
simultaneously.
The following set of commands may be used to control and interrogate the
instrument:-
Command X – Start real-time output
The instrument transmits the average particulate measurement as it is
displayed on the screen. The measurement updates at intervals of 1 second.
Each transmission terminates with the carriage-return line-feed characters
(ASCII characters 0x0A 0x0D).
Example
2.87<CR><LF>
2.55<CR><LF>
2.60<CR><LF>
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