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E Serial Telegrams
E.1 General
A serial interface can be used in two different modes:
- Send out time of telegrams automatically (periodically)
- Receive command, send time telegram (on request)
Output modes
Auto Periodic transmission of a time telegram or a command at the end of a
second, minute, hour, or at a max. of 6 programmable times of the day, or
definable output – periodicity.
on request Telegram is transmitted on request. The 'request' strings can be defined.
The following requests are possible:
- stop output
- output telegram at once (singly)
- output telegram at the next second (singly)
- output every second / minute / hourly / daily or switch to auto-mode.
Telegram format
Any character sequence. Fill characters ASCII or binary.
Variable display: ASCII decimal, ASCII hexadecimal or binary. Different
variables are assigned to strings in text tables (e.g. month: Jan, Feb...). Syntax for the
telegram string analogous to the print command in the programming language "C". See
chapter E.2 Syntax of the telegram configuration file.
Telegram time
The telegram always contains the time information for the "next" second for periodical
telegram output. The telegram content is valid at the send time of the first character.
The send time of the telegram can be shifted with the parameter TC (e.g. the standard
IF 482 telegram valid at the end of the telegram).
The transmission time of a time telegram can be calculated with the following table.
According to the transmission format set, the transmission time in ms for one character
is read from the table and multiplied by the number of telegram characters:
7 data bits 8 data bits
parity none odd/even none odd/even
stopp byte 1 2 1 2 1 2 1 2
ms per transmited byte
300 bit/s 30.00 33.33 33.33 36.67 33.33 36.67 36.67 40.00
600 bit/s 15.00 16.67 16.67 18.33 16.67 18.33 18.33 20.00
1200 bit/s 7.50 8.33 8.33 9.17 8.33 9.17 9.17 10.00
2400 bit/s 3.75 4.17 4.17 4.58 4.17 4.58 4.58 5.00
4800 bit/s 1.88 2.08 2.08 2.29 2.08 2.29 2.29 2.50
9600 bit/s 0.94 1.04 1.04 1.15 1.04 1.15 1.15 1.25
19200 bit/s 0.47 0.52 0.52 0.57 0.52 0.57 0.57 0.63
38400 bit/s 0.23 0.26 0.26 0.29 0.26 0.29 0.29 0.31