Transfer Parameters; Byte Sequence; Update Rate; Number Formats - janitza UMG 511 Manual

Transfer parameters

The UMG511 supports the following transfer parameters:
Baud rate : 9.6kbps, 19.2kbps, 38.4kbps, 57.6kbps, 115.2 kbps and 921.6 kbps
Data bits : 8
Parity : none
Stop bits (UMG511) : 2
Stop bits external : 1 or 2

Byte sequence

The data in the modbus address list can be called up in the
• Big-Endian (high-Byte before low-Byte) and in the
• Little-Endian (low-byte before high-byte)
format.
The addresses described in this address list supply the data in the „Big-Endian" format.
If you require the data in the „Little-Endian" format, you must add the value 32768 to the address.

Update rate

The modbus register addresses are updated every 200ms.

Number formats

Type Size
char 8 bit
byte 8 bit
short 16 bit
int 32 bit
uint 32 bit
long64 64 bit
float 32 bit
double 64 bit
C
Energy values are processed in double format.
The energy values can be read about the Modbus addresses
in float format.

Symbols and definitions

N Total number of sample points per period
(For example, in a period of 20 ms)
k Sample value or number of samples per period
( 0 <= k < N)
p Number or identification of the phase conductor
(p = 1, 2 oder 3)
i Sample value k of the current of the phase conductor p
pk
u Sample value k of the neutral voltage of the phase
pNk
conductor p
P Real power of the phase conductor p
p
Minimum Maximum
0 255
-128 127
-2 2 -1
15 15
-2 2 -1
31 31
0 2 -1
32
-2 2 -1
63 63
IEEE 754 IEEE 754
IEEE 754 IEEE 754
General
UMG 511
5