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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

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