Siemens SITRANS F Series Operating Instructions Manual page 46

Connecting
5.2 Connecting the FC310
Note
End Of Line (EOL) termination
The FCT010 EOL termination DIP switch is default set to EOL active. To change termination
setting see Warnings (Page 45).
It is important to terminate the Modbus RS 485 line correctly at the start and end of the bus
segment since impedance mismatch results in reflections on the line which can cause faulty
communication transmission.
If the device is at the end of the bus segment, it is recommended to terminate the device. The
table below shows the relation between the DIP switch settings and the permissible
communication interface set-ups. Default configuration is EOL active.
Location of DIP switch
The DIP switch is located in the electronic as shown below.
Figure 5-1
DIP switch settings for communication set-up
DIP switch Communi‐
cation set-up
EOL active
EOL not active
NOTICE
Avoid DIP switch settings not mentioned in the table!
DIP switch settings not mentioned in the table above are not allowed and may reduce
communication interface reliability.
The device is provided with a preformed cable terminated with M12 style stainless steel
weather-proof plugs.
The cable screen is physically and electrically terminated within the body of the plug.
46
DIP switch location (all set to ON)
Switch 1 Switch 2
On On
On On
Switch 3 Switch 4
On On
Off Off
FC310 (From firmware 4.0)
Operating Instructions, 06/2018, A5E44036384-AA