KROHNE MFC 400 Modbus - Manual (Page 7)

ESTABLISH RS485 CONNECTION
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MFC 400
www.krohne.com 05/2013 - 4002525102 - AD Modbus MFC 400 R02 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 C6.8 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 24.
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 C6.8.1
"Baude rate" 1200, 2400, 3600, 4800, 9600,
19200, 38400, 57600, 115200
bps
19200 bps C6.8.2
Parity Even, Odd, No Even Parity C6.8.3
Data format Big Endian, Little Endian Big Endian C6.8.4
Transmission
delay
0...0.04 [s] 0 s C6.8.5
Stop Bits 1 Stop Bit, 2 Stop Bits 1 Stop Bit C6.8.6
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.