Vaisala PTB220 - Manual (Page 44)

U SER ' S G UIDE _______________________________________________________________________
38 ___________________________________________________________________ M210194 EN -A
120
65
133
145
104 120
ø6.5
F IGURE 5-1 Dimensions and mounting positions of PTB220
barometers
Electrical connections
In barometers with RS232C/TTL level serial/pulse interface the pin
assignment is as follows:
1 2 3 4 5
6 7 8 9
F IGURE 5-2 9-pin female subD-connector
T ABLE 5-1 Pin assignment for RS 232C/TTL serial/pulse output
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 pulse output (TTL level)
7 ground for supply voltage and TTL level serial
interface and pulse output
8 pulse trigger
9 supply voltage (10...30 VDC)
In barometers with RS 232C/485/422 serial interface the pin
assignment is as follows: