DIGITAL SIGNATURE (VALID ONLY FOR WM3M4C)
User’s Manual WM3M4 &WM3M4C
Time status 6.5.4.2
Control unit must also set the status of clock in register 47071. Statuses are defined in Table 5.
Time status timeout 6.5.4.3
Clock status changes to Unsynchronized after timeout (in minutes), which is set in register 47072.
Time zone 6.5.4.4
Write offset (in minutes) from UTC time to 47053.
Warning:
Energy meter does not support DST, so the current offset from UTC must be written.
Example:
Slovenia is UTC + 1:00, but in summer time writes 120 to 47053.
UTC / local time presentation 6.5.4.5
Time representation on LCD and in signature (JSON) can be displayed differently with UTC/local time
setting.
For example, time is set in UTC format, but you want to have local time on LCD and in signature. Then
UTC/local time setting should be set to 0x1 (BIT 0). It means that time on communication is in UTC
format and time on LCD and JSON is in local time.
Energy meter has 3 time presentations:
1. RS485 communication
2. LCD display
3. Timestamp in JSON transaction
Every one of them can be set to UTC or local time. Default state for all is local time.
Register 47073 UTC / local time setting (0 = local time, 1 = UTC)
Table 12: UTC / local time register
Time adjusting 6.5.4.6
Fine time adjusting is a way to compensate clock drift during charging. Up to +- 3 seconds adjusting is
permitted in register 47074.
6.5.5 Signature format
Energy meter supports hex (ASN.1) and Base 64 signature format in register 48188. Format can be set
in register 47059:
Table 13: Signature format
To Next Page
Loading...
