Lasair II Particle Counter Operations Manual
Page G-1
Appendix G
Native Serial (RS-2332) Communications
The Lasair II particle counter native communications mode is a simple, RS-232
point-to-point protocol, with no addressing or checksum overhead. It can be used
with a simple terminal emulator program, or be used as a basis for instrument
control. It is an upgrade path for users with older Lasair instruments.
Native Serial Protocol Fundamentals
•
All characters are echoed.
•
Software flow control (
CTRL-Q/CTRL-S
) is used.
•
A command prompt of “
>
” is output between commands and data packets.
•
Automatic data output is generated.
•
All commands return either an “
OK
” or an error response followed by a <
CR
>.
•
All commands except Lasair “
C
” commands return current parameter values.
This can be used for sanity checking.
•
Many commands are similar to older Lasair serial commands.
Native Serial Protocol Error Messages
Error --No C Command
The “
C
” command is given with no arguments.
Error --Not Supported
An invalid or unsupported “
C
” command was sent.
Error --Parameter
A command was sent with an insufficient number of
parameters.
Table G-1: RS-232 Connector Pinout
Pin
Pin Function
2
TX
3
RX
5
GND
