Configuring Rs485 Serial Communication - Danfoss VLT FC 103 Operating Manual

Operating Guide | VLT® Refrigeration Drive FC 103
FACTORY-INSTALLED OPTIONAL EQUIPMENT
Do not remove factory-installed wiring to terminal 27. If the drive does not run, refer to the documentation for the
optional equipment that is wired into terminal 27.
Procedure
1. When no interlock device is used, wire a jumper between control terminal 12 (recommended) or 13 to terminal 27.
This wire provides an internal 24 V signal on terminal 27. The drive is ready for operation.

5.11.8 Configuring RS485 Serial Communication

5.11.8.1 RS485 Features
RS485 is a 2-wire bus interface compatible with multi-drop network topology. This interface contains the following features:
• Either Danfoss FC or Modbus RTU communication protocol can be used.
• Functions can be programmed remotely using the protocol software and RS485 connection or in parameter group 8-**
Communications and Options.
• Selecting a specific communication protocol changes various default parameter settings to match the specifications of the
protocol, making more protocol-specific parameters available.
• Option cards for the drive are available to provide more communication protocols. See the option card documentation for
installation and operation instructions.
• A switch (BUS TER) is provided on the control card for bus termination resistance.
5.11.8.2 Configuring RS485 Serial Communication
Procedure
1. Connect RS485 serial communication wiring to terminals (+)68 and (-)69.
A Use shielded serial communication cable (recommended).
B See the Connecting to Ground section for proper grounding.
2. Select the following parameter settings:
A Protocol type in parameter 8-30 Protocol.
B Drive address in parameter 8-31 Address.
C Baud rate in parameter 8-32 Baud Rate.
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