Why use 55-42 for utility metering?
FEATURES | IEC 62055-41 (STS) | IEC 62055-42 (TRN-based) |
Designed for | Simple prepaid meters | Smart meters and modern systems |
Token security | Secure Modules (SMs) required | Cryptographic TRNs; supports DLMS/COSEM |
Communication model | One-way token entry (offline) | Compatible with two-way communication (AMI) |
Integration with smart metering stack | Limited | High — designed to integrate with smart systems |
Support for “over-the-air updates” | No | Yes (when integrated with AMI/HES) |
Key management flexibility | Centralised via STS Association | Can integrate with existing key management |
Vending control by utility | Hard to track multiple vending channels | Utilities can centralise and audit vending |