8.1.4 Parameter Settings for Modbus Communication
Table 50: Modbus Communication Parameter Settings
Parameter
Function
Parameter 8-30 Protocol
Select the application protocol to run for the RS485 interface.
Parameter 8-31 Address
Set the node address.
N O T I C E
The address range depends on the protocol selected in
parameter 8-30 Protocol
.
Parameter 8-32 Baud Rate
Set the baud rate.
N O T I C E
The default baud rate depends on the protocol selected in
parameter 8-30 Protocol
.
Parameter 8-33 Parity / Stop
Bits
Set the parity and number of stop bits.
N O T I C E
The default selection depends on the protocol selected in
parameter 8-30 Protocol
.
Parameter 8-35 Minimum Re-
sponse Delay
Specify a minimum delay time between receiving a request and transmitting a response. This
function is for overcoming modem turnaround delays.
Parameter 8-36 Maximum Re-
sponse Delay
Specify a maximum delay time between transmitting a request and receiving a response.
Parameter 8-37 Maximum In-
ter-char delay
If transmission is interrupted, specify a maximum delay time between 2 received bytes to ensure
timeout.
N O T I C E
The default selection depends on the protocol selected in
parameter 8-30 Protocol
.
8.1.5 EMC Precautions
To achieve interference-free operation of the RS485 network, Danfoss recommends the following EMC precautions.
N O T I C E
Observe relevant national and local regulations, for example regarding protective earth connection. Failure to ground the cables
properly can result in communication degradation and equipment damage. To avoid coupling of high-frequency noise between
the cables, keep the RS485 communication cable away from motor and brake resistor cables. Normally, a distance of 200 mm
(8 in) is sufficient. Maintain the greatest possible distance between the cables, especially where cables run in parallel over long
distances. When crossing is unavoidable, the RS485 cable must cross motor and brake resistor cables at an angle of 90°.
AJ363928382091en-000101 / 130R0983 | 103
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RS485 Installation and Set-up
VLT® Flow Drive FC 111
Design Guide