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
2TX
3RX
5GND
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