Campbell-scientific WINDSONIC 2-D Sonic Wind Sensors Manual de usuario descargar pdf (Pagina 19)

WindSonic Two-Dimensional Sonic Anemometer

7.2 Wiring

7.2.1 Serial Wiring (COMn)

CRBasic dataloggers (CR800 series, CR1000, and CR3000) support serial

communications with dedicated UART hardware on the datalogger control

ports. Two control ports can be configured as a single communications

(COMn) port. The WindSonic1 serial interface uses four wires as shown in

TABLE 7-2.

TABLE 7-2. WindSonic1 to Datalogger Connections

Description Color CRBasic Datalogger

WindSonic RxD Green COMn Tx

WindSonic TxD White COMn Rx

Power Red 12 Vdc

Serial/power reference Black G

Shield Clear G

The maximum cable length that can be used with a RS-232

interface depends on the baud rate, the nominal resistance of the

wire, the capacitance between conductors, and the capacitance

between the conductors and the shield. According to the

Electronic Industries Association RS-232D standard, a rough

rule of thumb is to limit RS-232 cable lengths to 15.24 m (50

feet) or less at 9600 baud.

NOTE

7.2.2 Serial Wiring (SDM-SIO1)

CRBasic dataloggers support serial communications using the SDM-SIO1

peripheral. The SDM-SIO1 converts RS-232 signals into Synchronous Device

for Measurements (SDM). SDM is a Campbell Scientific digital

communications protocol used between Campbell Scientific dataloggers and

SDM peripherals. At a 1 Hz measurement rate, a maximum of 4 WindSonic1s

can be measured by a datalogger. TABLE 7-3 describes the connections

between a WindSonic1 and SDM-SIO1.

TABLE 7-3. WindSonic1 to SDM-SIO1 Connections

Description Color SDM-SIO1

WindSonic RxD Green TX-Z

WindSonic TxD White RX-A

Power Red +12V

Serial/power reference Black G

Shield Clear G

1 2 ... 14 15 16 17 18 19 20 21 22 23 24 ... 45 46

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Campbell-scientific WINDSONIC 2-D Sonic Wind Sensors Manual de usuario Pagina 19