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Establish rs485 connection – KROHNE UFC 400 Modbus EN User Manual

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ESTABLISH RS485 CONNECTION

4

7

UFC 400

www.krohne.com

05/2013 - 4002744801 - AD Modbus UFC 400 R01 en

To establish a RS485 connection with the signal converter, prepare the master device with the
appropriate default settings or use custom parameters specified via display of the signal
converter.

The Modbus RS485 settings can be found in the menu C5.8 of the display. The following
parameters can be configured:

These settings can be changed via Modbus too. For further information refer to

Modbus RS485

Communication Settings

on page 21.

All devices connected to the bus, must have the same baud rate.

Parameter

Legal values

Default values

Display Fct. No.

Slave address

1...247

1

C5.8.1

"Baude rate"

1200, 2400, 3600, 4800, 9600,

19200, 38400, 57600, 115200

bps

19200 bps

C5.8.2

Parity

Even, Odd, No

Even Parity

C5.8.3

Data format

Big Endian, Little Endian

Big Endian

C5.8.4

Transmission

delay

0...0.04 [s]

0 s

C5.8.5

Stop Bits

1 Stop Bit, 2 Stop Bits

1 Stop Bit

C5.8.6

INFORMATION!
It is of great importance to ensure at the time of the procedure of devices addressing, that there
are not two devices with the same address. In such a case, an abnormal behaviour of the whole
serial bus can occur. It is then impossible for the master to communicate with all present slaves
on the bus.