Vaisala PTB200 - Manual (Page 11)

PTB 200 10 (28)
Digital Barometers
SSD/Operating Manual 24th February 1993 PTB200-O0284-1.1
3 SERIAL COMMANDS
3.1 General
When delivered from factory the barometers are in serial full duplex RS
232C mode. No handshaking lines are in use. All commands are
echoed. The factory settings of the serial bus are:
baud rate 1200
parity even
data bits 7
stop bits 1
echo ON
sending mode STOP
address 0
The following table briefly shows the configuration commands used to
change the settings of the PTB 200 barometers.
Function Command Comment
serial bus settings SERI
echo on/off ECHO
output format FORM
pressure resolution FORM
units UNIT
integration time MTIM, FILT
settling time, response
time MTIM, FILT
sending mode SMODE STOP, RUN and POLL
modes
address ADDR for POLL mode only
single output command SCOM in STOP and RUN modes
only
sleep mode SLEEP
list of software settings ?
The default output format, pressure resolution and pressure unit have
been set to fit meteorological requirements. The internal time constants
of the barometers have been chosen to prioritize short settling time
(PTB 200 A: 2 s, PTB 201 A: 1 s) and high pressure resolution (PTB
200 A: 0.01 hPa, PTB 201 A: 0.1 hPa). If longer settling time can be
accepted, use longer integration time to suppress noise effects.