Campbell Scientific CSAT3 3-D Sonic Anemometer - Manual (Page 60)

Appendix B. Serial Communications with the CSAT3
TABLE B-1. RS-232 Command Codes
Command Trigger before
Command Description
Trigger after
Command
& PC or CSAT3
timer
Unprompted data output mode. Send data and make
measurements at the rate specified by the An command.
CSAT3 timer
P 1 CSAT3 timer or
PC
Send the RS-232 status (TABLE B-9) and trigger the next
measurement now.
PC 2
U 1 CSAT3 timer or
PC
Send wind data and trigger the next measurement now. PC 2
S PC or
CSAT3 timer
Send the RS-232 status (TABLE B-9). The next
measurement will be made in sync with the CSAT3 timer.
CSAT3 timer
W PC or
CSAT3 timer
Send the wind data. The next measurement will be made in
sync the CSAT3 timer.
CSAT3 timer
A(1..e) 1,3,4 PC or
CSAT3 timer
Begin acquiring the signals in sync with this command. No change
O SDM, PC, or
CSAT3 timer
Turn the analog outputs off in sync with the next trigger. No change
L SDM, PC, or
CSAT3 timer
Turn the analog outputs on with ±32 m s –1 full-scale range in
sync with the next trigger
No change
H SDM, PC, or
CSAT3 timer
Turn the analog outputs on with ±64 m s –1 full-scale range in
sync with the next trigger
No change
1 The CSAT3 will ignore this command if a datalogger (SDM) is triggering
the anemometer.
2 After the PC takes over as the trigger source it must continue to trigger the
CSAT3 at the rate specified in the Execution Parameter (An). If the
CSAT3 does not receive a trigger for three seconds it will enter the Lost
Trigger state. The Execution Parameter (An) will have to be issued in
order for the anemometer to exit the Lost Trigger state.
3 Acquire signal commands.
An Execution
Parameter
An Execution
Parameter
A1 Not Used A9 10 Hz
A2 1 Hz Aa 12 Hz
A3 Not Used Ab 15 Hz
A4 Not Used Ac 20 Hz
A5 2 Hz Ad 30 Hz
A6 3 Hz Ae 60 Hz
A7 5 Hz Ag 60 Hz → 10 Hz
A8 6 Hz Ah 60 Hz → 20 Hz
4 The PC must send the second byte of this command (2..e) within two
seconds of the first byte or the anemometer will reset itself. It will then
acquire the signal using the Execution Parameter in static memory.
B-2