Campbell-scientific CSAT3 3-D Sonic Anemometer Manuale Utente Scaricare il pdf (Pagina 61)

Appendix B. Serial Communications with the CSAT3

Nassi-Shneiderman diagrams are given in FIGURE B-1and FIGURE 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.

FIGURE B-1. PC as the trigger source

FIGURE B-2. CSAT3 as the trigger source

B.2 CSAT3 Binary Data Output Format

Five words are sent by the CSAT3’s RS-232 output. Words 0 through 3 are 16

bit signed integers and word 4 is 16 bit unsigned integer. The five words are

sent starting with word 0 and ending with word 4. A description of each word

is given in TABLE B-2.

B-3

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 73 74

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Campbell-scientific CSAT3 3-D Sonic Anemometer Manuale Utente Pagina 61