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Signature (Eichrecht versions)
Introduction
The signature, available in Eichrecht compliant versions, is a 256-bit or 384-bit data field that guarantees data authenticity. The
process of the digital signature includes three stages:
1. Generation stage: an algorithm generates a couple of correlated keys,
the private key, which is known only by the DCM1 itself, and
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the public key, lasered on the front of the meter (QR code) and available through Modbus RTU.
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2. Authentication stage: the set of data collected by the DCM1 is signed using the private key, which asserts the authenticity of
the data,
3. Integrity stage: the data can be verified by the user only through the public key that matches the private one. Otherwise, the
system leads to an error. It guarantees the integrity of the data reported by the device.
DCM1 implements this procedure to ensure the information it reports is not corrupted by an external system because no one apart
from the DCM1 knows the private key, which is necessary to verify the authenticity of the data.
Signed Modbus map (Only in DEB models)
In DEB versions with Modbus RTU port, in addition to the standard Modbus map, DCM1 provides an additional set of data,
including a 256-bit (S2 version) or a 384-bit (S3 version) signature.
Version
S2
S3
OCMF file (Only in DEB models)
OCMF file is a signed text file including charging session fiscally relevant information. DCM1 provides the OCMF file at the end of
each charging session through specific Modbus registers (see the Communication Protocol for further information).
Version
S2
S3
Run-hour meters
DCM1 provides the following run-hour meters:
Run-hour meter
Run hour meter (kWh+ TOT)
Run hour meter (kWh+ PAR)
Run hour meter (kWh- TOT)
Run hour meter (kWh- PAR)
Run hour meter (ON time TOT)
Run hour meter (ON time PAR)
Note: Ist is the default value (see Datasheet), which can be changed using UCS software or the Modbus command (see
Communicaton Protocol).
Signature
256-bit
384-bit
Signature
256-bit
384-bit
Increases...
when the power is positive and the current above +Ist
when the power is positive and the current above +Ist
when the power is negative and the current below -Ist
when the power is negative and the current below -Ist
Total ON time of the device
Total ON time of the device
DCM1 - User manual | 02/07/2024 | CARLO GAVAZZI Controls SpA
Description
256 bit ECDSA SHA 256, using curve
brainpoolP256r1
384 bit ECDSA SHA 348, using curve
brainpoolP384r1
Description
256 bit ECDSA SHA 256, using curve
brainpoolP256r1
384 bit ECDSA SHA 256, using curve
brainpoolP384r1
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