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PTB 200 11 (28)

Digital Barometers

SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1

The PTB 200 barometers have three sending modes: STOP, RUN and

POLL modes. In STOP mode (factory setting) after power-up the

barometer outputs its type code and software version number and then

waits for further commands. In RUN mode pressure output starts

automatically from power-up. POLL mode is meant mainly for

adjustment and calibration where several barometers are connected to

one RS 232C bus.

The following table briefly shows the commands used to control the

operation of the PTB 200 barometers:

Command Comment

starting output R

stopping output S

output single reading SEND address required in POLL

mode

setting output interval INTV

control of a single barometer

in POLL mode

OPEN,

in POLL mode only

resetting RESET

error messages ERRS

The commands are not case sensitive. However, the pressure unit must

be given in the format given at the UNIT command (see UNIT

command).

3.2 Configuration commands

SERI Serial bus settings

SERI b p d s<cr>

where

b baud rate (300, 600, 1200*, 2400, 4800, 9600)

p parity (E=even*,O=odd,N=none)

d data bits (7* or 8)

s stop bits (1* or 2) (* factory settings)

<cr> carriage return is generated by the ENTER or RETURN key of

the host computer

The SERI command is used to set or inspect the serial bus settings.

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Vaisala PTB200 Manual de usuario Pagina 12