Communication Modules - Honeywell EW773 Manual De Instalación

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6.2 Communication modules

The meter supports two communication channels. An additio-
nal communication module can be used in radio operation. The
protocol is different for each of the two channels and is preset ex
works, but can be set to customer-specific requirements using the
IZAR@Set software. Each channel has its own primary address,
but only one secondary address exists, which is set to the serial
number ex works.
6.2.1 M-Bus
The M-Bus communication module is a serial interface for com-
munication with external devices (M-Bus control centre), e.g.
IZAR CENTER. A number of meters can be connected to a control
centre. The module contains a 2-pole terminal strip with terminals
marked 24, 25.
· The connection is not polarity-conscious and is
electrically isolated
· M-Bus protocol to EN 1434-3 standard
· 300 or 2400 bauds (auto baud detect)
· Connection for 2 x 2.5 mm² wires
· Current drawn: one M-Bus load
6.2.2 Communication over radio
The integrated radio module is an interface for communication
with Hydrometer radio receivers.
Unidirectional communication has the following specification:
· The module sends every 8 ... 256 s (variable, depending on
protocol length)
· The radio module always accesses the current meter registers
· Transmission frequency: 868 MHz or 434 MHz