CARLO GAVAZZI WM4-96 - PROGRAMMING Uživatelský manuál stáhnout pdf (Strana 11)

CARLO GAVAZZI

CONTROLS

SERIAL COMMUNICATION PROTOCOL

WM4-96

V1 R3

Page

(the decimal point position has to be set to “1.11Kwh (Kvarh)”).

Whereas the total meters MSB (5

byte) is contiguous to the less significant bytes, the partial meters

MSB (5

byte) is stored in a different area of the memory. For this reason it is required to carry out

two different read commands in order to get all the energy meter information.

2.5 READING OF THE ENERGY METER VALUES

8-bytes request frame (read command, 10 word):

01h 04h 00h ECh 00h 0Ah

CRC

25-bytes answer frame (read command):

ECh

EDh

EEh

EFh

F0h

F1h

F2h

F3h

F4h

F5h

01h 04h 14h 00h 00h

00h 00h 94h 59h FFh

FFh 94h 02h

F6h

F7h

F8h

F9h

FAh

FBh

FCh

FDh

Feh

FFh

00h 00h BEh

FEh

FFh

FFh 00h 00h 00h 00h

CRC

Starting from address ECh, it is possible to read all the energy meters by means of a single read

command (10 word, see the example above).

Reconstruction of the kWh+ total meter

The first 4 data bytes (less significant bytes) have to be placed side by side in the opposite order:

Efh

EEh

EDh

ECh

00h 00h 00h 00h

00000000h=0

The obtained 32-bit value has to be interpreted as a two’s complement value.

The relevant kWh+ MSB (byte n° 17), which has to be interpreted as a two’s complement value too,

must be multiplied by 1000000000 (decimal value). The result has to be algebraically added to the

previous value.

FCh

00h

1000000000*0=0

Finally the last result has to be divided by 100.

0+0/100=0 kWh

Example 5: reconstruction of the kWh- total meter

F0h

F1h

F2h

F3h

94h 59h FFh FFh

FF FF 59 94h = -42604

FDh

00h

Gross Automation (877) 268-3700 · www.carlogavazzisales.com · [email protected]

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