Vega VEGACONNECT 4 Operating Instructions Manual - page 13
13
5 Connection examples
VEGACONNECT 4 with connection box • Interface converter USB - HART/I²C
32628-EN-170202
1
2
OP
EN
TWIS
T
USB
LO
CK
Fig. 6: 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-cir
-
cuited. Digital communication with the PC is then no longer possible.
With low impedance processing systems, a resistance of at least
230 Ω must be integrated into the 4 … 20 mA connection cable. The
connection of VEGACONNECT 4 can be either carried out in parallel
to the sensor or via the resistor.
Note:
When connecting to a VEGAMET 381, VEGADIS 371 or
VEGATRENN 141/142/151/152 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 condition-
ing 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