LF 170
Overview
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11/2010
1.2.3
RS 485 digital interface (RT RS option)
The monitor can communicate with other instruments via the RS 485
digital interface of the RS instrument versions.
The following operating modes are possible:
z
Master mode (
Prn
mode): Unidirectional mode for the output of
measured values. The main and auxiliary measured values are sent.
The interface is constantly active in master mode. The data are sent
to a data terminal (e.g. PC with terminal software or printer).
z
Slave mode (
SL
mode): Bidirectional mode in the bus network. In this
operating mode the monitor ("slave") works together with a control
computer ("master") on the master/slave principle. A total of 31
slave devices can be connected to one master in the bus network.
All slave devices are addressed by the control computer under their
bus address and execute the transferred commands, e.g. sending
measured values, calibration data and relay states.
Note
The RS 485 interface that accompanies the RT RS instrument versions
is described in detail in a separate manual.
PROFIBUS connection
The monitor can be connected to a PROFIBUS DP network via the
RS 485 interface with the PROFIBUS converter PKV 30-DPS that is
available as an accessory.
1.3
Nameplate
Fig. 1-2
Nameplate (example)
The nameplate also includes the serial number as well as details of the
supply voltage and the installed instrument options. The nameplate is
located on the right side of the housing.
Ser.-Nr: xxxxxxxxx
230 VAC 50/60Hz 18VA
WTW
LF 170-RTRS
Instrument options