Metrohm 768 KF Manual Del Usuario página 39

Protective earth
Direct connection from cable connector to protective earth of instrument.
Polarity allocation of the signals
•
Data lines (TxD, RxD)
Voltage negative (<-3 V): Signal status "ONE"
Voltage positive (>+3 V): Signal status "ZERO"
•
Control or message lines (CTS, DSR, DCD, RTS, DTR)
Voltage negative (<-3 V): OFF status
Voltage positive (>+3 V): ON status
In the transition region from +3 V to -3 V the signal status is undefined.
14C88 Driver, 14C89 Receiver, in compliance with EIA RS232C specifications.
No liability whatsoever will be accepted for damage or injury caused by improper
interconnection of instruments.
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768 KF Oven