MA-025 – DGA 900 Operator Guide – Rev 2.0 12-Apr-19 Page 85 of 92
Appendix D Time Sync Implementation
The product has a time-sync feature that allows users to synchronize the clock. This
Appendix explains the data format options for the “time sync” and its implementation.
D.1 Time Format
Under the standard Modbus® register list, the timing is defined in Table D-1.
Table D-1: Timing
UTC Clock: Hours, minutes
UTC Clock: Seconds, Day of week
(0-6, 0 Sunday)
This R/W (read/write) register is in BCD format (Binary Coded Decimal). Some systems are
not compatible with this data format. *The time registers can be written separately in 5
second intervals in any order.
D.2 UNIX® Epoch register
A UNIX Epoch register was added to the host board firmware (v1.12.2) to make systems
integration easier in cases of system incompatibility. Both register formats (BCD & UNIX)
will be maintained in future firmware versions and both affect the same single clock. The
details of the UNIX time registers are listed in Table D-2.
Table D-2: UNIX time registers
Current Time UTC
in UNIX format
These registers are readable and writable, but should be written together as a single 32-bit
value.
D.2.1 UNIX Time Format
The number of seconds from the UNIX epoch time of Jan 1st 1970 00:00:00.
D.2.2 UNIX Time Example
For reference, the time on a device is reported in the UTC format on the HMI as 11/29/2017
00:00:00 BST and the corresponding value in the registers mentioned above is
1511913600.
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