Owner manual

8.3 RS232 interfaces
746 VA Trace Analyzer / 747 VA Stand
8-17
8.3.6 Pin assignment
RS232C interface external
Transmitted Data (TxD)
If no data transmission takes place, the line is maintained in
the ”ON” condition. Data are sent only when CTS and DSR are
in the ”ON” condition and DCD is in the ”OFF” condition.
Received Data (RxD)
Data are received only when DCD is ”ON”.
Request to Send (RTS)
ON condition: 746 VA Trace Analyzer is ready to send data.
Clear to Send (CTS)
ON condition: Remote station is ready to receive data.
Data Set Ready (DSR)
ON condition: The transmission line is connected.
Signal Ground (GND)
Data Carrier Detect (DCD)
ON condition: The received signal level is within the tolerance
range (remote station is ready to send data).
Data Terminal Ready (DTR)
ON condition: 746 VA Trace Analyzer is ready to receive data.
Fehler! Keine gültige Verknüpfung.
Protective earth
Direct connection from cable connector to protective earth of
the device.
Polarity assignment 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.
Driver 14C88 acc. to EIA RS 232C specification
Receiver 14C89 acc. to EIA RS 232C specification
Contact arrangement at the sockets
"RS 232 Interface 1" and "RS Interface 2"
(male)
1 13
14 25
Connection cables to external devices must
have an appropriate 25-pin connector (female).
Metrohm offers connector sockets (K.210.9004)
and the associated housing (K.210.0001) as an
option for the preparation of such cables.
No liability whatsoever will be accepted for damage arising from the improper connection of devices.