HMC
(
HOPF
M
ANAGEMENT
C
ONSOLE
)
SOFTWARE
60 / 76
8024GPS - GPS Sync Module - V02.00
hopf
Elektronik GmbH
Nottebohmstr. 41
• D-58511 Lüdenscheid • Tel.: +49 (0)2351 9386-86 • Fax: +49 (0)2351 9386-93 • Internet: http://www.hopf.com • E-Mail: [email protected]
3.6.4.5.6.11.2 Structure
Character No.
Meaning
Hex-Value
1
Start flag
$68
2
Length of Information
$0F
3
Repeated length of Information
$0F
4
Start flag
$68
5
Control field
$44
6
Station address
$FF
7
Frame Type identification
$06
8
Variable structure identifier
$81
9
Cause of transmission
$08
10
Common address of ASDU
$FF
11
Function type
$FF
12
Information number
$00
13
Milliseconds (Low octet)
$0000-$EA5F
14
Milliseconds (High octet)
15
Minutes (0..59) + MSB = Invalid Flag
$00-3B, $80-$BB
16
Hours (0..23) + MSB = SU Summer time Flag
$00-17, $80-$97
17
Days (1..31)
$01-$1B
18
Months (1..12)
$01-$0C
19
Years (00..99)
$00-$63
20
Checksum (sum of fields 5 to 19 mod 256)
$00-$FF
21
End flag
$16
MSB of minute:
1 = clock is not synchronous (time invalid or quartz)
0 = clock is synchronous
MSB of hour:
1 = daylight saving time
0 = standard time
The seconds are displayed in the value of the milliseconds.
Thus the millisecond value runs from 0 .. 59999 decimal or from 0000 .. EA5F hexadecimal.
(If output is set to the minute change this value is always 0)
The checksum is the sum of byte 5 to 19 Modulo 256.
3.6.4.5.6.11.3 Example
The length of the data string is fixed to 21 characters. All characters including special
characters are allowed. Only binaurally values are transmitted.
The transmitted values are given out hexadecimal:
<68><0f><0f><68><44><ff><06><81><08><ff><ff><00><00><00><05><88><11><07><09><fe><16>
•
Time is 08:05:00.000 at 17
th
July 2009
•
daylight saving time
•
The clock is synchronous.
