V2CP Legacy Released 2012 DIN SPEC 70121:2014-12
DIN SPEC 70121
Vehicle ↔ Charge Point
Pre-ISO baseline for DC fast charging communication. Subset of early ISO 15118 draft. Still deployed in older CHAdeMO-adjacent and first-generation CCS infrastructure. No PnC, no TLS mandate.
DC fast chargingLegacy baselineRFID onlyNo TLS mandate
6,800 deployments
Adoption
Older CHAdeMO / first-gen CCS stacks
Capability matrix
| DC fast charging | ✓ Supported |
| RFID authorization | ✓ Supported |
| Plug & Charge | — Not supported |
| Smart charging negotiation | — Not supported |
| TLS (mandatory) | — Not supported |
| V2G | — Not supported |
Migration intelligence
DIN SPEC 70121 → ISO 15118-2
DIN SPEC 70121 deployments cannot support Plug & Charge. Migration to ISO 15118-2 requires firmware update or hardware replacement. Most first-gen CCS infrastructure entered EOL planning 2022–2025.
Security layer
No TLS mandate
DIN SPEC predates mandatory TLS. Communication unencrypted in most deployments.
No certificate auth
RFID UID only. No PKI, no contract certificates.
Risk profile
High: plaintext communication, no mutual auth. Addressed via OCPP Security Profiles at management layer.
Message flow 6 message types
01
SupportedAppProtocol EV → CP
DIN SPEC version handshake
02
SessionSetup EV → CP
Session initiation (simplified subset)
03
ChargeParameterDiscovery EV → CP
DC charge limits exchange
04
CableCheck EV → CP
Insulation resistance check
05
PowerDelivery EV → CP
Start energy delivery
06
SessionStop EV → CP
End session
Deployment examples illustrative · not an endorsement
Legacy CCS1/CCS2 stations
First-gen installations, pre-2016
Tritium Veefil (early units)
Firmware-upgradable to ISO 15118-2
ABB Terra (pre-2016 units)
Pre-ISO 15118 hardware generation
← All protocols DIN SPEC 70121 · Vehicle ↔ Charge Point