VEGA VEGACONNECT 4 - Manual (Page 15)

1
2
OPEN
TW
IST
USB
LO C K
Fig. 8: Connection VEGAMET/VEGASCAN via I²C interface
1 I²C bus (Com.) interface
2 I²C connection cable
Note:
Communication with the sensor is carried out with VEGAMET 624/625
and VEGASCAN 693 also via the front I²C interface of the signal
conditioning instrument. The connection of VEGACONNECT 4 directly
to the 4 … 20 mA sensor cable is not possible.
5.2 Connection via HART
If the resistance of the connected processing system is less than
230 Ω, the digital adjustment signal is extremely damped or short-
circuited. Digital communication with the PC is then no longer possible.
With low impedance processing systems, a resistance of approx.
230 Ω must be integrated into the 4 … 20 mA connection cable. The
connection can be either carried out in parallel to the sensor or via the
resistor.
Note:
When connecting to a VEGAMET 381, VEGADIS 371 or VEGA-
TRENN
149 there is no additional HART resistor required. These
instruments have also connection sockets for direct connection of the
2 mm pins.
When using VEGAMET 624/625, VEGASCAN 693 signal conditioning
instruments, the connection cannot be carried out via the sensor cable.
The parameter adjustment of the signal conditioning instrument as well
as of the sensor can be carried out via the I²C connection sockets.
VEGAMET 624/625,
VEGASCAN 693
HART communication
VEGACONNECT 4 with connection box • Interface converter USB - HART/I²C 15
5 Connection examples
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EN
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