Version: 1.06 185
Appendix B. Time in RTU
One of the biggest issues in Telemetry and data logging equipment is the handling of time.
In order to have a universal solution, wherever the TB
OX
MS is used, TWinSoft, OS of the RTU
and ‘Windows’ collecting data, shares the mechanism of time management.
It is based on UTC time.
B.1. Time in TBox MS
The RTC (Real Time Clock)
The TB
OX
MS is equipped with a RTC chip (Real Time Clock). The RTC is used to manage all
internal time.
Functions of the RTC:
• it is a calendar Y2000 compatible.
• it updates the UTC time (see next).
• it communicates with OS to handle the UTC time, used for data logging.
The RTC time is used at start-up of TB
OX
MS to update the UTC.
UTC Time
UTC time is based on the number of seconds since 1/1/1970 at Greenwich latitude. It is used as
internal timestamp to each event (alarm, chronology, …)
The UTC time is converted in Special Analog Registers to give access to time information:
second, minute, hour, day, month, year.
Changing UTC time automatically updates the RTC.
When time information is sent (in a report, as header of an e-mail, in the Analog special
register), it is always computed using the UTC time, according to the time settings in the
‘General’ RTU properties.
TBox MS Time setting
In order to set TB
OX
MS to PC time, an option is available in the 'Communication' menu of the
main menu bar.
When connected to TB
OX
MS (locally or remotely), the option is available. By clicking the
option, the RTU is set to the time of the PC.
Check afterwards in the 'RTU Identification' option, also part of the 'Communication' menu.
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