Configuring the instrument
61
subject to a plausibility check.
Immediately after receipt of the transmitter or after changing the configuration, we recommend that
you back up the existing configuration on a separate data medium.
An RS485 interface will be needed for communication between a PC and the transmitter.
• The driver for this interface must support a COM port.
• The software communication tool must be set to the same COM port as the RS485 interface.
• The baud rate for configuration of the transmitter is fixed to 1200 baud and must be set to the same
value inside the communication software tool.
• The communication protocol of the transmitter has to be set to ‘CONFIG/HART-RS485’ with the HMI
or the dip switches (dip switches 3 and 4 to position 1; see Figure 44 below).
For operating with a Modbus master after configuration, the transmitter must be set back to
‘OPERATE/MODBUS’ with the HMI or the dip switches (dip switch 4 to position 0).
Before starting configuration via a software communication tool, the transmitter function must be
switched from ‘Operate’ to ‘Configuration’ mode (using the HMI) (see “Toggling communication
modes” on page 67).
—
Figure 44
Modbus communication board
ENABLE
1
NV FORMAT
0
PROTOCOL MODE
1
0
SW
3
1
SW
1
0
DISABLE
MODBUS
TM
P/N : 3KXL001060U0400
ENABLE
DISABLE
SW
4
CONFIG / HART-RS485
OPERATE / MODBUS
1 2 3 4
ON
1
1
Dip switches
NOTICE
Settings configured via DIP switches always have priority over the ones set with the
HMI. For more information on these parameters, see “Configuring communications” on
page 67.
Содержание LWT300 series
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