Iskra WM3M4 - Consumption Measuring and Digital Signing; Crypto Register Definitions

DIGITAL SIGNATURE (VALID ONLY FOR WM3M4C)
User’s Manual WM3M4 &WM3M4C
33
6.4 Consumption measuring and digital signing
procedure
EV charger control unit must use following procedure to measure charging consumption and sign
billing dataset:
1. Set time, time zone, signature format
2. Enter billing dataset
3. Enter dataset size
4. Send Begin command
5. Send intermediate reading commands (optional)
6. Send fiscal reading (optional)
7. Send tariff change command (optional)
8. Send End command (triggers signing process)
9. Check signature status register until signature is ready
10. Read Output message length
11. Read Output message
12. Read signature length
13. Read signature
14. Read public key
6.5 Crypto Register Definitions
6.5.1 Communication parameter
MODBUS register
Description
Format
Value
40203
Baud Rate
T1
0
Baud rate 1200
1
Baud rate 2400
2
Baud rate 4800
3
Baud rate 9600
4
Baud rate 19200
5
Baud rate 38400
6
Baud rate 57600
7
Baud rate 115200
40204
Stop Bit
T1
0
1 Stop bit
1
2 Stop bits
40205
Parity
T1
0
No parity
1
Odd parity
2
Even parity
40206
Data Bits
T1
0
8 bits
Table 9: RS485 communication parameters table
Default settings:
Baud rate: 115200
Parity: None
Stop bits: 1