Setting Up Rs485 Serial Communication - Danfoss VLT Compressor Drive CDS 803 Guia De Funcionamiento

VLT® Compressor Drive CDS 803
Operating Guide
BUS TER.
OFF ON
61 68 69
18 19 27 29 42
Illustration 6: Control Terminals

3.2.4 Setting Up RS485 Serial Communication

3.2.4.1 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 (default protocol)
- Modbus RTU
•
Functions can be programmed remotely using the RS485 connection or in parameter group 8-** Communications and Options.
• A switch (BUS TER) is provided on the control card for bus termination resistance.
Altering between the supported communication protocols can be accessed and changed via the LCP as parameter 8-30 Protocol is
not available in VLT® Motion Control Tool MCT 10.
3.2.4.2 Configuring RS485 Serial Communication
Procedure
1. Connect RS485 serial communication wiring to terminals (P RS485) 68 and (N RS485) 69.
- Use shielded serial communication cable.
- Properly ground the wiring. Refer to
Danfoss A/S © 2021.06
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N O T I C E
1.3.2.5 EMC-compliant Electrical Installation.
AQ32174876762701-000301 / 130R0627 | 21
Installation