Liebherr WKt 4552 GrandCru - Manual (Page 6)

6
Address 1 Address 2 Address 3
RS 485
+ - s
- + s
Optimum:
Shielded Twisted Pair
- + s - + s
Terminator
120 Ohm
Terminator
120 Ohm
BUS line
appliance 1 appliance 2 appliance 20
Liebherr
Temperature
Monitoring
Software for
Serial Interface &
Infrared key
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The RS 485 bus connection is made using standard shielded data cables, e.g. type LiYCY 2 x 0,14 mm 2 . The
maximum possible length of the data lines depends on the quality of the components used. The maximum
range is 500 m. A maximum of 20 appliances can be wired in series.
Dedicated software is provided in the accessory package allowing visualisation, analysis and export to other
formats for storage. The software reads the air-probe temperature at 2 minute intervals and records alarm
conditions. When an alarm condition is registered the software will warn on the PC on which the software
is running. If this PC is not supervised (e.g. at night or over weekends) then the alarm signal might not be
recognised. In order to avoid unrecognised alarms the software includes an email function, which sends an
email in case of an alarm condition to predefined email addresses. These emails can be easiliy checked with
a smartphone. Therefore the user will be warned without having direct access to a computer.
LKPv and LGPv laboratory appliances with Profi-Controller
RS 485 interface and optional signal converter
All LKPv and LGPv models have an RS 485 interface. If an RS 485 monitoring system is not already in place,
a converter kit is available as an optional extra to convert the RS 485 signal to an RS 232 signal and allow
connection to a PC or laptop.
Networking
Both laboratory appliances with Profi-Controller as well as laboratory appliances with Comfort-Controller can be networked using the same Liebherr accessory
package “RS 485 interface converter including temperature monitoring software”.
Example: RS 485 network