Vaisala PTB210 SERIES Guia do Utilizador descarregar pdf (Página 13)

Chapter 3 _______________________________________________________________ Installation

VAISALA _______________________________________________________________________ 11

Connections

There are three different serial output interfaces available with the

PTB210 digital barometers: RS232C, RS485/232C, and

RS232C/TTL. The connections depend on the output protocol in use.

In following tables there are presented the connections of these output

interfaces.

RS232C

Table 1 Connections of the PTB210 Barometer with RS232C

Interface.

Wire color Si

nal

Gre

Green TX

Blue Groun

volta

(

5 ... 28 VDC

)

Brown not connecte

White not connecte

Yellow External power control

(

TTL level: 1 = 5 V= off

0 = 0 V= on

)

It is recommended to isolate the free wire ends.

RS485

Table 2 Connections of the PTB210 Barometer with

RS485/RS232C Interface

Wire color Si

nal

Gre

(

with RS232C

)

Green TX

(

with RS232C

)

Blue Groun

volta

(

8 ... 18 VDC

)

Brown RS485 -

White RS485 +

Yellow External power control

(

TTL level: 1 = off

0 = on

)

See also chapter "Setting the RS485 Terminating Resistor On/Off "on

page 19.

NOTE

The two output protocols cannot be used simultaneously. Connect

either RX/TX or RS485 wires. It is recommended to isolate the free

wire ends.

1 2 ... 8 9 10 11 12 13 14 15 16 17 18 ... 31 32

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