# SDO Service data objects – acyclic communication

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For acyclic parameter data handling VAT is using a standard EtherCAT mailbox transfer. The mailbox protocol is CoE (CANopen over EtherCAT), compliant to DS301 (CiA Draft Standard 301 v4.02).

Note: This list of the acyclic communication is depending on the installed firmware version. Please check this information in the product specific Manual.