33
= Key1
= Key 2
= Key 3
= Max. value or consumption = Min. value or supply
Read data sets
The reading of data sets is controlled by the follo-
wing addresses:
Read address
19000
dez
.
The first 4 Bytes provide the contents of the ring
buffer pointer.
The next 12 Bytes provide the first data set, which
the pointer points on.
The ring buffer pointer is increased
automatically
by the number of read Bytes, but the first four Bytes
are not included.
Write address
19000
dez.
Set ring buffer pointer on a data set of the ring
buffer.
If the ring buffer pointer is overwritten by 0000, it
points on the last read beginning of ring buffer with
address
19008
dez
.
Read address
19002
dez.
Read a number (4 Bytes) of data sets from that
address on, on which the pointer points. The ring
buffer pointer is increased
automatically
by the
number of read Bytes. The number of read Bytes
must be divisible by 12.
Read address
19004
dez.
Provides that address (4 Bytes), on which the actual
pointer points.
Read address
19006
dez.
Read a number of data sets, from that address on,
on which the pointer points. The ring buffer pointer
is not increased.
Read address
19008
dez.
Delivers the number (4 Bytes) of the Bytes saved in
ring buffer. If you divide this number by 12, the result
is the number of the saved data sets.
The ring buffer pointer is set to the last data set in
ring buffer. The contents of this pointer is therefore
zero.
Overwrite address
19010
dez with 2 Bytes with a
content by choice
New data sets are written into the ring buffer uncom-
pressed. If data were saved before in a compressed
form, the ring buffer will be deleted.
Read address
19010
dez.
Delivers the storage format of the ring buffer in 2
Bytes.
00=compressed ring buffer
01=uncompressed ring buffer
Overwrite address
19020
dez with 2 Bytes with a
content by choice.
New data sets are written into the ring buffer
compressed. If data were saved before in a uncom-
pressed form, the ring buffer will be deleted.
Overwrite address
19030
dez with 2 Bytes with a
content by choice.
The ring buffer will be deleted.
Example 1: Read the last saved data set.
Read adress
19008
dez
. The ring buffer pointer
(0000) is set to the last data set in ring buffer.
Read 12 Bytes from address
19006
dez
. 12 Bytes
correspond to one data set. The ring buffer pointer
is not increased.
Example 2: Read all saved data sets.
1.) Read address
19008
dez
. The number of saved
Bytes is read. If you divide the result by 12, the num-
ber corresponds to the saved data sets. The pointer
points to the last saved data set in ring buffer.
2.) Read the content of the Bytes in ring buffer by
address
19002
dez
. With the MODBUS-Protocol, at
maximum 240 Bytes=20 data sets can be read per
reading. The number of read Bytes must be divisib-
le by 12.
The ring buffer pointer is increased automatically by
the number of read Bytes and points to the next data
set, which has not been read yet.
3.) Repeat reading of address
19002
dez
as long as
all data sets have been read.
Attention!
If a failure appeared during data transmission,
the complete procedure must be repeated,
starting with step 1.
Example 3: Read all saved data sets.
1.) Read address
19008
dez
. Reads the number of
saved Bytes in ring buffer. Divided by 12, the num-
ber of saved data sets is the result. The pointer
points to the last saved data set.
2.) Read address
19000
dez
. The first 4 Bytes refer
to the actual address of the pointer. The next 12
Bytes provide the first data set of the ring buffer.
With MODBUS-Protockol you can read 244Bytes
(4Byte + 20 data sets) at maximum per reading.
3.) Repeat reading address
19000
dez
as long as all
data sets have been read.
Attention!
If a failure occured during data transmission,
the last actual address of the ring buffer
pointer must be written on address
19000
dez
and the last reading procedure must be
repeated.