Vaisala PTB220 Series Guide de l'utilisateur télécharger pdf (Page 13)

CHAPTER 2___________________________________________________ PRODUCT DESCRIPTION

VAISALA __________________________________________________________________________ 7

Block diagram

The PTB220 series digital barometers consist of a CPU board and 1, 2

or 3 pressure transducers (P1, P2 and P3). The number of pressure

transducers is order specific and the configuration cannot be changed

by the user. Usually the pressure transducers are connected to the

same pressure port. However, in case of two pressure transducers, the

barometer can have also two pressure ports, one for each transducer.

The various hardware configurations are illustrated on page 77.

The PTB220 series barometers always have a RS 232C full duplex

and a bidirectional TTL level serial interface. In addition, the

barometers have either a pulse output interface or an RS 485/422 two-

wire half duplex serial interface. The RS 485/422 interface is a

separate optional module inside the barometer. This interface module

is order specified and installed at the factory only. There is also an

optional factory set analog output module available. A LCD display

with backlight is also a possible configuration option.

The block diagram of the PTB220 series barometers is shown in

FIGURE 2-3

FIGURE 2-3 Block diagram of the PTB220 barometers

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 112 113

Pas de commentaire

Vaisala PTB220 Series Guide de l'utilisateur Page 13