Technical data

29
RS485 / CM-485
serial communication
The CM-485 communication module is designed for high speed data transmission over
long distances in industrial applications. RS485 bus supports data exchange among 30
nodes in a bidirectional 2-wires system.
The interface is based on a DB9 connector, following the standards for physical
transmission of data ITU V.11 and ANSI EIA/TIA-422B
CM-485 communication card includes the end-of-line terminating resistor that can be
activated or disconnected by means of an on-board dip switch.
The RS485 network address of the inverter is set by software parameters either via
KP500controlunitorbymeansofPCinserialcommunicationwithKP-232.TheRS485
complies with ISO standard 1745 for code-bound data transmission. The standard data
exchange rate and monitoring functions can be set using VPlus software.
Cable lenght Max Baud rate
up to 12000m 4.8
up to 2000m 19.2
Cable length limits the transmission
bandwith. Above table shows the match
between admissible cable lengths and
corresponding max kBaud rates. Values are
indicative and may significantly change
in relation to the transmission cable
characteristics.
CM-485 module
RS485 line
PC/Notebook
Location of CM-485 module on the
frequency inverter