Metrohm 758 KFD Titrino Manuel d'utilisateur télécharger pdf (Page 137)

3.3 Properties of the RS 232 Interface

758 KFD Titrino

133

3.3.2 Pin Assignment

RS232C Interface

Transmitted Data (TxD).

If no data are transmitted, the line is held in the “ON” condition. Data

will only be sent when CTS is in the ”ON” condition.

Received Data (RxD)

Request to Send (RTS)

ON condition: Titrino is ready to send data.

Clear to Send (CTS)

ON condition: Remote station is ready to receive data.

Signal ground (GND)

Data Terminal Ready (DTR)

ON condition: Instrument is ready to receive data.

Protective earthing

Direct connection from cable plug to the protective ground of the instrument.

Polarity allocation of the signals

- Data lines (TxD, RxD)

voltage negative (<–3 V): signal state ”ON”

voltage positive (>+3 V): signal state ”ZERO”

- control or message lines (CTS, RTS, DTR)

voltage negative (<–3 V): OFF state

voltage positive (>+3 V): ON state

In the transitional range from +3 V to –3 V the signal state is undefined.

Driver 14C88 according to EIA RS 232C specification

Receiver 14C89 " "

Pin 4

Data Terminal Ready

Pin 5

Signal Ground

Pin 8

Clear To Send

Pin 7

Request To Send

Pin 2

Received Data

Pin 3

Transmitted Data

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Metrohm 758 KFD Titrino Manuel d'utilisateur Page 137