Modem; Multidrop-Operation; Burst-Operation; Adjustment With Hart Handheld - Vega EL 11 Operating Instructions Manual

With this function you can start a new
connection. This function can also be activated
with key F8.

Modem

This window enables the adjustments for data
transmission with a modem. This function can
also be activated with key F7.
No special requirements necessary for the
modem used.
Note
When the resistor of the supply voltage is less
than 250 Ω, a resistor must be looped into the
signal/connection line during adjustment. The
digital adjustment and communication signals
would be shortcircuited via too small resistors
e.g. of the current source or the processing
system so that the sensor communication
would no more be ensured. The easiest way
would be to connect the required resistor in
parallel to the socket of the HART
(see fig. 1, page 38).
36
4.4 Adjustment with HART
The capacitive electrodes EL with oscillator
CAP E32 H Ex are suitable for HART
and can be adjusted with a HART
HART
All relevant sensor functions can be carried out
with the HART
manufacturer specific DDD (Data-Device-
Description) is not necessary.
Connect the HART
® -handheld
after you have connected the sensor to the
supply voltage.

Multidrop-operation

With the HART
operation can be chosen.
Hence several HART
composed on one two-wire line.
The sensor provides beside the 4 ... 20 mA-
signal also a digital (HART
• When you enter address 0 (factory setting),
the sensors takes a level independent 4 ...
20 mA-current and delivers a digital (HART
level signal. In this line e.g. also an indicating
instrument (4 ... 20 mA) can be looped.
• When you enter an address from 1 to 15, the
sensor takes permanently a current of 4 mA
and delivers a digital (HART

Burst-operation

Normally the sensor signals the measured
values to the processing unit only on request.
When you switch on Burst-operation, the sensor
signals the measured values without request.
handheld
® -handheld
®
-standard menus. A
®
-handheld to the signal line
®
-handheld the Multidrop-
® -sensors can be
Capacitive electrodes EL 4 ... 20 mA - compact
Set-up
®
-
®
-protocols
®
-handheld.
+ - + -
1 2 3 4
mA
250 Ω
®
) level signal.
® )
®
) level signal.