Vaisala PTB210 SERIES Manuel d'instructions télécharger pdf (Page 48)

Serial sensors are not as easy to handle. The following example of pressure readings

illustrates this issue.

First you have to set up the datalogger‘s ports for communication with a non-PakBus

device.

SerialOpen(Com1,9600,10,0,0)

SerialOpen(Com2,9600,10,0,0)

When the serial open function is executed, the serial ports are "opened" at 9600

baud and subsequent textual messages will ﬂow in and out of the port in between

PakBus packetes. The format parameter "10" speciﬁes the type of error detection

to be used for the exchange of data. "10" equates the manufacturers’ instructions

of an RS232 logic type, even parity, one stop bit and 7 data bits for communication

with Vaisalas PTB210 barometer.

Accordingly serial text messages have to be transmitted through the serial lines for

operating the digital sensors.

SerialOut(Com1,Command,"",0,100)

SerialOut(Com2,Command,"",0,100)

Thus, the as constant deﬁned "Command" is sent to both sensors including the

necessary parameters for operation, ".P", carriage return <cr> and line feed <lf>.

As a result serial data of both sensors in form of pressure readings in hPa is received

within the AirPress-Array as follows:

SerialIn(AirPress(1),Com1,100,10,10)

SerialIn(AirPress(2),Com2,100,10,10)

The acquired information of port conﬁguration and measuring processing can be

brought forward to handle all the other sensors. For details see the appendix section

A on page 79.

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Vaisala PTB210 SERIES Manuel d'instructions Page 48