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

VLT® HVAC Drive FC 102
Operating Guide
4. Set switches A53 and A54 to select the signal type (U = voltage, I = current).
Example
Illustration 62: 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:
• Ability to select from the following communication protocols:
- FC, FC MC, FC option
- Modbus RTU
- Metasys N2
- FLN
- BACnet
•
Functions can be programmed remotely using the protocol software and RS485 connection or in parameter group 8-** Commu-
nications and Options.
• Selecting a specific communication protocol changes various default parameter settings to match the specifications of the pro-
tocol, making more protocol-specific parameters available.
• Option cards for the drive are available to provide more communication protocols. See the option card documentation for in-
stallation and operation instructions.
• A switch (BUS TER) is provided on the control card for bus termination resistance.
5.12.2 Configuring RS485 Serial Communication
Procedure
1. Connect RS485 serial communication wiring to terminals (+) XD2.2 and (-) XD2.3.
- - Use shielded serial communication cable.
- - Properly ground the wiring. Refer to
2.
Select the protocol type in parameter 8-30 Protocol.
3.
Select the drive address in parameter 8-31 Address.
Danfoss A/S © 2021.11
5.8.6 Connecting to Ground.
Electrical Installation
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