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The Modbus protocol is a communications protocol that is based on a client-server architecture. It was created in 1979. In the industry, the Modbus has developed into a de facto standard since it is an open protocol.

Modbus allows connecting a server and several clients, usually via Ethernet. Three different operating modes are differentiated for data transmission: Modbus ASCII, RTU and TCP.

Multi-Fieldbus is the ability of Kollmorgen servo amplifiers to communicate with a lot of different fieldbus systems. These bus systems are accessible either with option cards, firmware variants or device variants.


SERCOS (SErial Real time COmmunication System) interface is a worldwide standardized digital interface  for the communication between controls and drives (IEC 61491 and EN 61491).

DeviceNet is a CAN based field bus which is used mainly in the automation engineering.

Number of nodes

Maximum 64 nodes per bus segment. Node addresses (0 to 63) can be set with DIP switches on the servo amplifiers.


Selectable are: 125 kBaud, 250 kBaud and 500 kBaud. Baud rates can be set with DIP switches on the servo amplifiers.