With the growing deployment of smart metering systems, ensuring secure and reliable communication between smart meters and utility providers is crucial. The DLMS/COSEM Security Suite 1 offers a standardized framework for secure data exchange and authentication in smart metering applications. This paper focuses on the implementation of an PSA-based OIML R46 communication unit, following the principles of the Platform Security Architecture framework, to achieve compliance with DLMS/COSEM Security Suite 1 specifications. The proposed communication unit integrates cryptographic algorithms, secure storage mechanisms, and key management protocols to guarantee the confidentiality, integrity, and authenticity of the transmitted data. Furthermore, the unit undergoes rigorous testing using the DLMS Conformance Test Tool V3.1 to validate its compliance and interoperability. The results demonstrate the successful implementation of a secure OIML R46 communication unit that meets DLMS/COSEM Security Suite 1 requirements and has undergone thorough CTT V3.1 testing.