Vaisala PTB200 - Manual (Page 12)

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,
CLOSE 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
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)
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.