Wiring

The GENIbus-communication is based on the RS485-standard running in half duplex-mode. Therefore a 2-wire-communication with a plus (A) and a minus (B) cable must be set up.
The serial-communication-terminals KL6021, KL6041 and EL6021 and the serial bus of the CX9020 can handle the half duplex-, but also and the fullduplex-mode. In this mode the plus and the minus channel exists both for the sending (Transmit-Data, TxD) and receiving-channel (Receive-Data, RxD). To use the half duplex-mode correctly, you must connect Rx- to Tx- as well as Rx+ to Tx+.
The serial bus of the CX8080 can only handle the half duplex-mode, so no direct connection between any bus-inputs is neccessary.

Note

The described plus- and minus-connection to the GENIbus-module (port A for plus and port B for minus) only applies for the CIM 050, which was used for the tests. Before connecting the Beckhoff-terminals to the Grundfos-hardware, please read the documentation of the Grundfos-module, which terminals are the right ones. Furthermore, this chapter only describes the serial-bus-connections. For long wirings a shielding of the cable will be unenviable.

Wiring diagrams:

KL6021, KL6041 and EL6021

CX9020 (this configuration is not available as a program-example)

CX8080