Danfoss FC 300 Design Manual page 275

FC 300 Design Guide
FC 300 Parameter Settings for Modbus Communication
The following parameters apply to the RS-485 interface (FC-port):
Parameter Number
8-30
8-31
8-32
8-33
8-35
8-36
8-37
EMC Precautions
The following EMC precautions are recommended in order to achieve interference-free operation of the
RS-485 network.
NB!
Relevant national and local regulations, for example regarding protective earth connection,
must be observed. The RS-485 communication cable must be kept away from motor and
brake resistor cables to avoid coupling of high frequency noise from one cable to another.
Normally a distance of 200 mm (8 inches) is sufficient, but keeping the greatest possible dis-
tance between the cables is generally recommended, especially where cables run in parallel
over long distances. When crossing is unavoidable, the RS-485 cable must cross motor and
brake resistor cables at an angle of 90 degrees.
RS-485 Installation and Set-up
Parameter name Function
Protocol Select the application protocol to run on the RS-485
interface
Address Set the node address. Note: The address range de-
pends on the protocol selected in par. 8-30
Baud Rate Set the baud rate. Note: The default baud rate de-
pends on the protocol selected in par. 8-30
PC port parity/Stop Set the parity and number of stop bits. Note: The
bits default selection depends on the protocol selected in
par. 8-30
Min. response delay Specify a minimum delay time between receiving a
request and transmitting a response. This can be
used for overcoming modem turnaround delays.
Max. response delay Specify a maximum delay time between transmitting
a request and receiving a response.
Max. inter-char delay Specify a maximum delay time between two received
bytes to ensure timeout if transmission is interrup-
ted.
MG.33.B7.02 - VLT is a registered Danfoss trademark
275