GE TRANSFIX DGA 500 - Appendix A Time Sync Implementation; Table A-1: Timing; Table A-2: UNIX Time Registers

MA-014 - TRANSFIX DGA 500 User Guide – Rev 1.1 13-Oct-15 Page 26 of 28
Appendix A 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.
A.1 Time Format
Under the standard Modbus® register list, the timing is defined in Table A—1.
Table A—1: Timing
Register
Permissions
Group
Size
Description
Data
Format
1200
R/W
4*
UTC Clock: Years
YYYY (BCD)
1201
UTC Clock: Months, days
MMDD (BCD)
1202
UTC Clock: Hours, minutes
HHMM (BCD)
1203
UTC Clock: Seconds, Day of week
(0-6, 0 Sunday)
SSWW (BCD)
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
seconds interval in any order. This feature is available starting TransfixHost v1.12.4.
A.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 A—2.
Table A—2: UNIX time registers
Register
Access
Flags
Version
Storage
Class
Effect
After
Name
Description
Data
Format
1197
rg2,wg2
1.12.2
RAM
immediately
RTC_UNIX
_TIME
Current Time
UTC in UNIX
format
32-bit
integer
1198
These registers are readable and writable, but should be written together as a single 32
bit value.
A.2.1 UNIX Time Format
The number of seconds from the UNIX epoch time of 1st Jan 1970 00:00.