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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

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)

1 2 ... 80 81 82 83 84 85 86 87 88 89 90 ... 112 113

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Vaisala PTB220 Bedienungsanleitung Seite 85