Process Unit 73 LF - Knick

How to set the interface parameters
Open a Parameter Setting menu, select ”Interface”
using , and confirm with .
Select the type of bus connection, baud rate and
number of data/parity bits, and enabled or disabled
write protection using and respectively,
and confirm with .
Tips for Application
If you connect the Process Unit 73 LF to the
RS 232 interface of a PC or compatible via an
RS 232 C/RS 485 interface adapter, you must observe
the following:
The connection lead between the Process Unit 73
LF and PC is bidirectional. Therefore the converter
must know the direction of transmission. If no data
are sent, the converter must disable its transmission
driver. With commercial converters, this
changeover is usually done via a handshake line
(e.g. DTR or RTS).
The changeover must be controlled by the driver
program of the PC. Commercial PC terminal programs
do not automatically perform this changeover.
Some converters (e.g. W&T Type 86000) can operate
in ”Automatic Mode”. Here, the driver will be
automatically disabled after a short period. However,
this can cause bus timing errors if the automatic
turn-off time does not correspond to the
baud rate used. The W&T converter has automatic
turn off times for the baud rate 115200 bauds.
According to experience, operating the Process
Unit 73 LF in this case at the highest possible
baud rate (9600 Baud) will offer the best results.
Capabilities 9–51