—
Ch a p tER 8
Configuring communications
There are two types of communication at play in the Modbus LWT300 instruments. For general
data
exchange
operations with external computer systems (PCs, flow computers, etc.) communications go
over the Modbus protocol (Modbus RTU with 2-wire half-duplex RS-485 serial interface). For
instrument
configuration
(with software tools running on a computer), the HART communication protocol is used
(via a RS-485 serial interface).
NOTICE
The Modbus protocol was never designed for configuration tasks. Thus, it cannot be used
to configure a LWT300 remotely.
Communication parameters for these protocols are set from the
Communication
menu.
—
Figure 48
The Communication menu
Toggling communication modes
LWT300 instruments always operate in one of two modes: Operation or Configuration. Operation mode
is the normal mode for data exchange over the Modbus protocol and Configuration mode is the mode
to use when configuring the instrument over the HART protocol. These modes can be set either in
software of hardware.
Toggling via HMI
To toggle communication mode via the instrument HMI:
1
From the
Communication
menu, select
Device Mode
.
2
Click
Edit
and select
Operation
(Modbus)
or
Configuration
(HART), as necessary.
3
Click
OK
. Your instrument is now in communicating in the mode that you chose.
NOTICE
If communication does not seem to work after toggling communication mode, verify the
communication parameters set via the dip switches (next page).
Содержание LWT300 series
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