janitza UMG505, Operating Instructions Manual, Page: 32 / 112

32 = Key1 = Key 2 = Key 3 = Max. value or consumption = Min. value or supply
Ring buffer data format
Data sets can be saved in compressed or uncom-
pressed form. With the presettings, the data are
saved compressed.
The programming and reading out software
PSW505 can read compressed data from ring buf-
fer only. Other applications can read data sets in un-
compressed form only.
An uncompressed data set consists of the type of
measured value, the date and the measured value.
This value is always given in Float format.
1)
r/w = read/write
2)
Measured values {float: Actual value[L1, L2, L3], Mean value[L1, L2, L3] , Minimum[L1, L2, L3], Maximum[L1, L2, L3]}
Changeover ring buffer
The changeover from compressed to uncom-
pressed data is carried out via the serial interface
and Modbus protocol.
If data should be saved uncompressed within the
ring buffer, address
19010 dez must be overwritten
by 2 Bytes of a content by choice.
If data should be saved uncompressed within the
ring buffer, address
19020 dez must be overwritten
by 2 Bytes of a content by choice.
Type of measured value
The type of the measured value can be determined
by the addresses from the tables 1a and 1b.
Example: If the type is marked by the decimal num-
ber „1004“, this corresponds to the current mean
value in phase L2.
Date
In the part of the data set with the description
„
Date“, the date and time of the measurement are
saved.
char: Year, Month, Day, Hour, Minute, Second
Diagr. Structure of „Date“
Meas. val. type Date Meas. value
2 Bytes
6 Byte 4 Byte (float)
Read ring buffer
If the data sets have been saved uncompressed,
they can be read via the serial interface with
Modbus protocol.
To make this reading easy, there is a
ring buffer
pointer available. This ring buffer pointer always
points to the beginning of a data set. One data set
consists of 12 Bytes.
 Attention!
If another way of compression is selected,
the total content of the ring buffer is deleted.
Table 1a, Measured value
Meas. val. in floating point form.
Description Addr.(dez) r/w1)Type
Current 1000 r Meas. val
2)
A L1, L2, L3
1001 r Actual value in L2
1002 r Actual value in L3
1003 r Mean value in L1
1004 r Mean value in L2
.. .. ..
Voltage N-L 1012 r Meas. val.
2)
V L1, L2,
Voltage L-L 1024 r Meas. val.
2)
V L1-L2, L2-L3,
Real power 1036 r Meas. val.
2)
W Sign -=Supply.
.. .. .. .. .. ..
Extract from table 1a
Diagr. Assign measured value type.
Type Date Meas. value
2 Bytes 6 Byte 4 Byte (float)
Ring buffer
Data set 1
Data set 2
Data set 3
.
.
.
Data set n
Data set n+1
.
.
Oldest data set in ring buffer
Ring buffer pointer = 0000.
Last saved data set
Next data set, that will be
saved
Diagr. Data sets in ring buffer.