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7 Serial
communication
An RS485 interface (4-wire or 2-wire mode, changed by command “BD”, see CH.
7.2.1
) with
several baudrates (command “BR”) is available at the Laser Precipitation Monitor for the serial
communication.
The communication can be carried out, for example, by means of a standard terminal program and
a PC. With a Windows-based operating system delivery , for example, contains Hyper Terminal. If
necessary, it must be installed later.
4-wire/full-duplex mode (factory setting) :
The receive lines in the sensor are terminated with a resistance of 560
Ω
when a so-called Jumper
is directly above the contacts “R-“ and “R+” on the 2-pole connecting-pin-line.; see wiring diagram
(CH.
9
).
2-wire / half-duplex mode :
The transceiver lines in the sensor are terminated with a resistance of 560
Ω
when a so-called
Jumper is directly above the contacts “T-“ and “T+” on the 2-pole connecting-pin-line.; see wiring
diagram (CH.
9
).
NOTE:
Half-duplex mode
In the sensor there are no so-called bias-resistors (pull-up and pull-down) to get
the voltage level (>0.2V) for the RS485-norm, when the network is idle.
This resistors must be provided by the remote station (e.g. PC).
Содержание 5.4110 00 Series
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