Setting Up Rs485 Serial Communication - Danfoss VLT HVAC Drive FC 102 Operating Manual

Operating Guide | VLT® HVAC Drive FC 102
• Terminal XD2.7: Speed reference signal in open loop (see parameter 16-61 Terminal 53 Switch Setting).
• Terminal XD2.8: Feedback signal in closed loop (see parameter 16-63 Terminal 54 Switch Setting).
Procedure
1. Disconnect power to the drive.
2. Remove the LCP (local control panel).
3. Remove any optional equipment covering the switches.
4. Set switches A53 and A54 to select the signal type (U = voltage, I = current).
Example:
Illustration 56: Location of Switches A53 and A54

5.12 Setting Up RS485 Serial Communication

5.12.1 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.
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Electrical Installation
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