Vaisala PTB220 - Manual (Page 86)

U SER ' S G UIDE _______________________________________________________________________
80 ___________________________________________________________________ M210194 EN -A
In barometers with RS232/analog output, the pin assignment is as
follows.
PIN SIGNAL
1 TX with diode
2 TX/TXD/TXD inverted
3 RX/RXD/RXD inverted
4 external power on/off control
5 ground for the RS 232C
6 voltage output (0...5 VDC) / current output (0...20 mA)
7 ground for supply voltage
8 voltage output ground / current input ground
9 supply voltage (10...30 VDC)