Remote Operation
Handheld Terminal
Operating the Prosonic transmitter is
even easier if it is connected via a serial
interface. All values can then be entered
using a handheld terminal. The user has
comprehensive and detailed information
on inputs both on-site and in the control
room. The measurement remains totally
unaffected during the interactive input.
Two different handheld terminals are
available:
•
Commulog VU 260 Z is used with the
serial interface for the INTENSOR
protocol. It can be connected to all
Endress+Hauser instruments with an
INTENSOR protocol.
•
Universal HART communicator via the
serial interface with the HART protocol
(Type C).
Electrical Connection
A minimum resistance must be present
in the circuit for correct transmission of
the communications signal to take place
(see Technical Data).
The handheld terminal is connected
either
•
directly to current output 1 of the
transmitter or
•
to a communications resistor.
In general: The handheld terminal can
be connected anywhere in the signal
circuit as long as there is a resistance
between its terminals which is larger
than the minimum communications
resistor.
Technical Data
Maximum load: 600 Ω
Communications resistor: 250 Ω
Screened cable recommended,
maximum capacitance 100 nF.
Operation via Commuwin II
The Commubox FXA 191 connects
intrinsically safe Smart transmitters that
have an INTENSOR- or HART protocol
to the RS 232 C serial interface of a
personal computer. This enables the
transmitter to be remotely operated with
the Endress+Hauser Commuwin II
operating program.
-
I-
45
I+
Field
Control room
4…20 mA
Communication
resistor
Connection of handheld
terminals Commulog
VU 260 Z (INTENSOR)
and Universal HART
Communicator
DXR 271 (HART) in the
field and in the control
room.
-
VH
Commuwin II
Commubox
optional
power pack
4…20 mA
minimum total resistance 250 Ω
RS 232 C
Connecting the
Commubox
5
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