Vaisala PTB220 User Manual download pdf (Page 23)

CHAPTER 4_____________________________________________________________ COMMISSIONING

VAISALA _________________________________________________________________________ 17

The RS485/422 interface of the PTB220 series digital barometers is a

non-isolated two-wire half-duplex interface. See page 93 for quick

reference information on how to use the RS485/422 interface of the

PTB220 series digital barometers.

ECHO Setting the serial bus echo on/off

ECHO x <cr>

where:

x=ONorOFF

The ECHO command is used to set or inspect the echoing condition of

the barometer. In OFF mode the barometer does not output the '>'

prompt character.

Examples:

>echo <cr>

Echo : ON

>echo off <cr>

Echo : OFF

...

echo on <cr> (text invisible)

Echo : ON

FORM Defining the output format

The FORM command is used to set or inspect the output format of the

barometer. See the examples in the next page.

FORM <cr>

The user can define the following fields into the output format:

amount of decimals give number of decimals before a

quantity. Giving 4.2 before the

pressure quantity outputs a reading

with the following form: 1013.12

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 112 113

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Vaisala PTB220 User Manual Page 23