The CiA 446 profile defines the CANopen interface for gateways connecting Actuator Sensor Interface (AS-Interface, here ASI) circuits. The gateway implements single or double ASI-master functionality with one or two ASI-circuits controlling up to 62 ASI-slaves each. The actually valid CiA 446 v. 1.0.0 is based on the AS-Interface specification v. 3.0 released in 2004. The latter is also required for interpretation of CiA 446. When implementing the profile, ASI-gateway manufacturers may supply diverse application fields using the same electronic CANopen interface implementation and simply adapting the required functionality. A system designer may choose between ASI-to-CANopen gateway devices from different manufacturers implementing the same profile-compliant functionality. Off-the-shelf CANopen tools may be used for development, analysis, and maintenance purposes.