Westermo U200 Operator manal - Manual (Page 39)

V4.5
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U/R/T200 series
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The UTC format is as follows:
• output UTC
• transmission every second
• transmission with control characters
• transmission with ETX on second increment
• transmission with second forerun
• transmission sequence of control characters CR/LF
• standard string date and time
The characters in each time update are as follows:
0 STX (Start of Text)
1 Status (internal status of the clock), see below
2 day of the week (Monday... Sunday) (hexadecimal coding)
Since ‘UTC-time’ is used, bit 3 in the “day of the week” is set to 1
3 tens - hours
4 unit - hours
5 tens - minutes
6 unit - minutes
7 tens - seconds
8 unit - seconds
9 tens - day
10 unit - day
11 tens - month
12 unit - month
13 tens - year
14 unit - year
15 LF (Line Feed)
16 CR (Carriage Return)
17 ETX (End of Text)
; where STX = 0x02, ETX = 0x03, LF = 0x0A and CR = 0x0D and status:
The Status byte in the UTC string is described in the table below:
Hex
representation
Nibble
representation
Description
Status 0
4
8
C
0 0 x x
0 1 x x
1 0 x x
1 1 x x
Time/date invalid 1
Crystal operation on SNTP client 2
Local clock operation on T200 SNTP server 3
GPS operation on T200 SNTP server 4
Days
of
week 0
8
9
A
B
0 x x x
1 x x x
x 0 0 1
x 0 1 0
x 0 1 1 CEST/CET
UTC-time
Monday
Tuesday
Wednesday
1
SNTP client/PTP Slave is not synchronized with a T200 SNTP server/PTP Grand Master.
2 SNTP client/PTP Slave is synchronized with a T200 SNTP server/PTP Grand Master
configured without external time base (no reference to absolute time).
3 SNTP client/PTP Slave is synchronized with a T200 SNTP server/PTP Grand Master with
external time base (GPS) that has lost GPS coverage (valid reference to absolute time).
4 SNTP client/PTP Slave is synchronized with a T200 SNTP server/PTP Grand Master with
external time base (GPS) with GPS coverage (valid reference to absolute time). Best
accuracy.