Campbell CR10 PROM Instruction Manual download pdf (Page 23)

APPENDIX B. SERIAL COMMUNICATIONS WITH THE CSAT3

B-2

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 acquire signal (An) command 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.

Generic flow charts are given in Figures B-1 and B-2 for collecting data using a PC and the RS-232 port.

In Figure B-1 the PC is the Trigger Source and the data acquisition system. In Figure B-2 the

anemometer is triggered by its internal timer and a PC is the data acquisition system. Use the logic in

Figure B-1 when the CSAT3 is measured along with other analog/digital signals.

set RTS line low

repeat until finished collecting data

wait until timer = 1/(Execution Parameter)

process data

read wind data (U) or long status (P) from serial port

make other PC based analog/digital measurements

sent the U or P command

set timer to zero

send the An command to acquire signals

until CTS line is high

read CTS line

set RTS line high

FIGURE B-1. PC as the Trigger Source.

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Campbell CR10 PROM Instruction Manual Page 23