VEGA RS232_Ethernet connection - Manual (Page 27)

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9 Measured value transmission to a WEB-VV server
RS232/Ethernet connection • VEGAMET 391/624/625, VEGASCAN 693, PLICSRADIO C62
30325-EN-130701
9 Measured value transmission to a WEB-VV
server
9.1 Prerequisites
The measured values dermined by the sensors are further processed
by the signal conditioning instrument and can be transferred to a
WEB-VV server. For this purpose, one of the following signal condi-
tioning instruments, including one of the optional interfaces (RS232 or
Ethernet), is required.
•
VEGAMET 391/624/625
•
VEGASCAN 693
•
PLICSRADIO C62
The transmission of readings is generally carried out via an Internet
connection, independent of the interface type or access mode. The
connection alternatives can be subdivided into the following three
groups:
•
Signal conditioning instrument with RS232 interface and ana-
logue/GSM/GPRS modem
•
Signal conditioning instrument with Ethernet interface and MoRoS
(ModemRouterSwitch)
•
Signal conditioning instrument with Ethernet interface directly con-
nected to the company network
The selection of the most suitable connection alternative is depend-
ent on the local conditions and the frequency of the measured value
transmission (refresh rate). If, for example, no telephone connection
or network with Internet connection is available, the transmission can
only be carried out via a wireless modem. This of course requires that
sufficient network coverage by a mobile communications provider
exists at the site. When transmission is carried out via GSM, charges
are usually based on the required time. For example, if one measured
value is transmitted every hour, sizeable connection costs will be
incurred every month. If GPRS is available, this transmission variant
should be chosen – the costs are considerably lower because the
charges are based on the transmitted volume, usually via a flat rate.
9.2 Signal conditioning instrument (RS232) with
analogue/GSM/GPRS modem
This alternative is used when only one signal conditioning instru-
ment has to be connected to WEB-VV and no company network with
Internet access is available. The signal conditioning instrument must
be equipped with the RS232 interface option.
The option of remote parameterisation is also available, i.e., the signal
conditioning instrument and the sensors can be accessed from out-
side the system. This allows settings for remote transmission as well
as parameterisation of the signal conditioning instrument/sensor to be
carried out or changed from a distant location.
The choice of modem depends on the local conditions. If an analogue
telephone connection is available on site, an analogue modem (PSTN
Signal conditioning
instruments
Connection types