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OVERVIEW
SERIAL INTERFACE
SETTINGS
P485 MODBUS TO PROFIBUS CONVERTER – USER GUIDE
Modbus network configuration
When controlling a Modbus sub-network with the P485 it is important to understand
functions during starting up. If the P485 starts scanning nodes on the sub-network, before
data is received from the fieldbus control system (fieldbus master), values of '00' may be
transmitted to the nodes before data is updated the first time from the fieldbus.
See Input/output data during startup on page 8–4 for information on how to block
transactions until valid data is received.
To be able to communicate on the Modbus network, various communication settings
needs to be configured. To gain access to these settings, select 'Modbus Network' in the
Navigation window.
Parameter
Description
Bit rate
Selects the bit rate.
Data bits
Selects the number of data bits.
Parity
Selects the parity.
Physical standard Selects the physical standard. This setting
activates the corresponding signals on the subnet
connector.
Start bits
Only one start bit is supported.
Stop bits
Either one or two stop bits can be selected.
SOFTWARE OVERVIEW
Range
1200 to 57600
7, 8
None, Odd, Even
RS232, RS422, RS485
1
1, 2
4–13
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