Vaisala PTB220 Series Guia do Utilizador descarregar pdf (Página 87)

APPENDIX C __________________________________________ RS232C/TTL LEVEL SERIAL INTERFACE

VAISALA _________________________________________________________________________ 81

APPENDIX C RS232C/TTL LEVEL SERIAL INTERFACE

The Appendix C shows connection of handshaking lines and the wave

forms, voltage levels and phases of the RS232C/TTL level serial

interface signals.

Handshaking lines (DCD, CTR, DSR, RTS and CTS) may have to be

connected at the host system end as illustrated below:

1 DCD

4 DTR

6 DSR

7 RTS

8 CTS

4 RTS

5 CTS

6 DSR

8 DCD

...

20 DTR

...

9-pin D connector 25-pin D connect

The next picture (below) shows a typical RS232C RX input signal

(upper signal) and TTL level serial RXD input signal (lower signal) at

baud rate 9600. The vertical scale is 10V/div for upper signal and

2V/div for lower signal. The ground level for each signal is shown

with a small arrow at the right. At the left, the signals are at rest. The

RXD inverted input signal has opposite phase compared to the RXD

signal shown here.

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Vaisala PTB220 Series Guia do Utilizador Página 87