Vaisala PTB220 Series - Appendix B: Pin Assignments; Pin Assignment for RS232 C;TTL

APPENDIX B ___________________________________________________________PIN ASSIGNMENTS
VAISALA _________________________________________________________________________ 79
APPENDIX B PIN ASSIGNMENTS
The pin assignment of the 9-pin female subD-connector of the
PTB220 series digital barometers seen from the front:
1234
5
67
8
9
In barometers with RS232C/TTL level serial/pulse output interface,
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 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 case a common ground is needed for both the power supply and the
serial interface, the pin 7 should be used as the common ground.
In barometers with RS 232C/485/422 serial interface 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 RS 485/422 LO
7 ground for supply voltage and TTL
level serial interface
8 RS 485/422 HI
9 supply voltage (10...30 VDC)