CARLO GAVAZZI EM21 - COMMUNICATION PROTOCOL V1 REV0 Instrukcja Użytkownika Pobierz pdf (Strona 12)

CARLO GAVAZZI

CONTROLS

SERIAL COMMUNICATION PROTOCOL

WM24-96

V1 R0

Page

2.2.6 Energy and utility meters reading

The meter values are to be read from the RAM as explained in the following examples.

Example 7: Reading of total energy meter: kWh (tot) and kvarh (tot) (TOT-PAR mode)

Value request frame (8 byte):

01h 04h 02h 41h 00h 03h CRC CRC

Value answer frame (13 byte):

01h 04h 08h FFh D6h 02h 00h 57h AAh 04h 00h CRC CRC

Stored value (kWh tot): 0002D6FFh 18611.1 kWh

Stored value (kvarh tot): 0004AA57h 30575.1 kvarh

Example 8: Reading of the utility meters: gas (tot) and water (tot) (TOT-2.CN)

Value request frame (8 byte):

01h 04h 00h F0h 00h 04h CRC CRC

Value answer frame (13 byte):

01h 04h 08h FBh 5Ah 1Ah 00h 4Ah 1Ch 19h 01h CRC CRC

Stored value (m

gas tot): 001A5AFBh 172722.7 m

Stored value (m

water tot): 01191C4Ah 1842285.8 m

2.2.7 Resetting energy and utility meters

Energy and utility meters are to be reset using the following fixed frames.

Example 9: total meters reset command

1-word write request command (8 byte):

01h 06h 01h 00h A5h F0h CRC CRC

Write answer command (8 byte):

01h 06h 01h 00h A5h F0h CRC CRC

The reset value is 0. The meters which are reset by this command are depending on the “counter”

parameter:

- counter=TOT-PAR Reset meters: kWh (tot), kvarh (tot)

- counter=TOT, TOT-1.CN or TOT-2.CN Reset meters: kWh (+),kWh (-)

kvarh C+, kvarh C-, kvarh L+, kvarh L-

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

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CARLO GAVAZZI EM21 - COMMUNICATION PROTOCOL V1 REV0 Instrukcja Użytkownika Strona 12