Vaisala PTB220 - Manual (Page 71)

C HAPTER 8____________________________________________ SELF - TESTING AND PROBLEM HANDLING
V AISALA _________________________________________________________________________ 65
CHAPTER 8
SELF-TESTING AND
PROBLEM HANDLING
Returning the serial communication
parameters
As the barometer software and hardware settings may not always be
known, it is important that the barometer can be returned to factory
settings. To do this, set the dip switch S1 on the CPU board as in
F IGURE 8-1 . All switches except the SW8 must be OFF. In addition, the
serial interface must be set for basic RS 232C operation according to
F IGURE 8-2 . With these selections, one single barometer can be
operated through the RS 232C serial interface using factory serial bus
settings as in
T ABLE 8-1 . Returning the SW8 to OFF will restore the
original application specific software settings.
ON
OFF
SW1
SW2
SW3
SW4
SW5
SW6
SW7
SW8
S1
F IGURE 8-1 Factory settings for the dip switch S1
TXD
RXD
X15
RX/RXD
TX
TXD
F IGURE 8-2 Basic RS 232C settings