Time in a MORSE CU appears in various forms:
GMT — entries to the CU are stored and transferred in this form
Local time — GMT time modified by CU time zone and by summer time
Operator time — GMT time modified by PC time zone
PC time — PC time including time zone and PC summer time
Uptime — number of sec from starting CU
Individual times appear in these menus:
in protocols such as Mars-A, Modbus, IEC, MAS
in protocols such as Mars-A, Modbus, IEC, MAS
d(i)ag stat (l)ogs
Alt+P, together with Setr parameters
(s)ervice (t)ime (s)econds
d(i)ag (t)ests stat. (t)est
A general idea of time is provided by menu (s)ervice unit (s)tatus, which in addition to other information contains local time, uptime, GMT and a record of the last time entry to the CU:
local time:2007-11-21 07:53:12 LOC; uptime:4944 sec day time:2007-11-21 06:53:12 GMT; log write at:86400 last update:2007-11-21 06:44:23 GMT
During the period of summer time the note “daylight savings” appear:
local time:2007-05-01 08:00:53 LOC/daylight savings; uptime:5405 sec day time:2007-05-01 06:00:53 GMT; log write at:86400
Overview of times and where to use them:
An entry of local time LOC is done in menu (s)ervice (t)ime.
Time: (d)ay time (s)econds set (n)ew time dat(e) set ne(w) date
The new local time entered using commands “stw” and “std” is adjusted according to the relationship given below by DI(F)F and DST and the GMT time obtained in this way is maintained in the CU internal clock.
If we enter a date here which changes the year it is necessary to restart the CU (sgB) or in “Ue” perform (I)nit and (S)ync or wait till midnight when the year will update automatically.
GMT and local time are bound by the relationship:
GMT + DI(F)F + DST = LOC
world time maintained in the CU clock
shift according to longitude, e.g. for central Europe 3600 s
shift by 1 hour during summer time (daylight savings)
local time set in menu (s)ervice (t)ime
Values DI(F)F and DST are controlled from menu (U)nit (e)dit, which amongst other things contain :
Time (Z)one for DST:EU Time zone DI(F)F:3600sec Summer time (all to zero - off): start (1)month:3 (2)day:30 end (3)month:10 (4)day:26
By selecting (Z)one (E)U in this menu we can switch on automatic use of summer time DST as well as annual automatic set-up of the correct date at the beginning and end of DST. In this case the item “obsolete(<605) Time (z)one” is invalid.
Alternatively by selecting (Z)one (N)ONE we can switch to manual mode and by selecting items (1), (2), (3), (4) we can select a fixed date at the beginning and end of DST. If we enter zeros here summer time is disabled.
Enter a time, for example, containing the year 2004:
In menu “Ue” set automatic selection of dates for summer time (EU), local time shift 3600sec and run Init and Sync:
Ue Enter Time (Z)one for DST:EU Time zone DI(F)F:3600sec I Enter S Enter
Then in menu “Ue” we can read the dates at the beginning and end of summer time:
Time (Z)one for DST:EU Time zone DI(F)F:3600sec Summer time (all to zero - off): start (1)month:3 (2)day:28 end (3)month:10 (4)day:31
Enter the date and time right before the end of winter time:
Now by repeatedly calling menu “ss” monitor the transition to summer time :
local time:2004-03-28 01:59:08 LOC; secs from cold start:19396 day time:2004-03-28 00:59:08 GMT; log write at:105469 local time:2004-03-28 01:59:58 LOC; secs from cold start:19446 day time:2004-03-28 00:59:58 GMT; log write at:105469 local time:2004-03-28 03:00:02 LOC/daylight savings; secs from cold day time:2004-03-28 01:00:02 GMT; log write at:105469
The transition took place at 01:00:00 GMT, when the difference between local time and GMT exceeded 1 hour.
If we want to monitor the transition from summer time to winter time, we would have to set the date to 31.10.2004, local time to 01:59:00 and wait 61 minutes until local time reaches 03:00:00 (i.e. 01:00:00 GMT). Then the local time returns to 02:00:01 (i.e. 01:00:01 GMT).
A precise source of time is available from :
a receiver of DCF time signals
GPS system receiver
WALRUS sw running on a linux computer
user protocols MARS-A, MODBUS, MAS, IEC 870-5-2(L&G) and others
time can be entered manually from menu (s)ervice (t)ime
Synchronisation of time between adjacent CUs can be set up in “Ue”:
Time sync: (i)n:1 Sr(c):690F5501 (p)eriod:3600 (O)ut:0 ds(t):00000000 p(e)riod:0
Time data can be periodically taken from an adjacent CU (1st row) or passed to another CU (2nd row). The first method allows for the synchronisation of more stations from one source.
The service is performed by the node determined by the selection
(O)ut, time data is requested from the
Sr(c) or sent to the CU
synchronisation repeats with a period
p(e)riod. Entry of the period (in seconds) activates the
The source or destination address needs to be selected as a directly accessible address, i.e. without routing. The accuracy of synchronisation is in milliseconds.
During synchronisation GMT time is transferred, and in a
synchronised CU the local time is derived according to menu
The minute impulse is a signal generated by the CU every minute
for a period of 1 second. The signal is generated only in the case where
(M)INP:ON is switched on in the menu Communication unit.
Communication unit: service (d)est:00000000 (N):0 (U)cc limit:130 * 0.1V (h)yst.:2 * 0.1V (s)tatus:0000 (P)SWD:OFF (L)OGW:OFF (M)INP:ON
The impulse is generated on the following pins:
|type of modem||pin name||pin number||port||SW|
|MR25X to HW version 11||RxC||35||SCC2||version 630 and higher|
|MR25XS to HW version 11||RxC + CD||35 + 13||SCC2||version 630 and higher|
|MR25X HW version 12 and higher||CD||13||SCC2||version 630 and higher|
|MR400 and MR900, Cannon connector||CD||1(RS232)||SCC0||version 714 and higher|
Note – the minute impulse is only generated on the whole minute. If there is a change in time in the CU the first delay between impulses will be truncated or extended in proportion to the change in time, for example:
current time in CU: 10:00:30
30 seconds elapsed from beginning of last minute impulse
time in CU is changed to : 11:11:10
50 seconds remain from beginning of new impulse
in such a case the delay between impulses is 50+30 = 80 seconds