Instruction
INFOCAL 8
9.0 Communication
The calculator supports three communication channels. Additional
to the radio communication two wired communication modules can
be used, e.g. two M-Bus modules. The protocol of the two channels
can be different but is preset at factory, whereby the radio telegram
will have the same content than the module 2. Customer specific
requirements can be defined by using the IZAR@SET Software. Each
port has its own primary address. Both ports have a common second-
ary address, which is set to the serial number ex works.
9.1 Communication via radio
The integrated radio module is an interface for communication with
OMS radio receivers.
Unidirectional communication has the following specification:
• The module sends every 12 s (send period 0.1 % of duty
cycle (min. 8 s); variable, depending on protocol length and
programming)
• The radio communicates the actual data register
• Transmission frequency: 868 MHz or 434 MHz
• Various Diehl Metering receivers are available for receiving
the protocol (e.g. Bluetooth, GPRS, LAN, …)
• The protocol corresponds to the”Open Metering”
or “DM Standard” and is encrypted
• Reading modes: Walk-By, Drive-By, Fixed-Network
• For problematic radio installations (shield) the external radio
module set can also be used
9.2 M-Bus communication module
The M-Bus communication module is a serial interface for communi-
cation with external devices (M-Bus control centres), e.g. IZAR CENT-
ER. 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 standard;
• 300 or 2400 baud (auto baud detect)
• Connection for 2 x 2.5 mm² wires
• Current drawn: one M-Bus load
9.3 RS232 Communication module
The RS232 communication module is a serial interface for communi-
cating with external devices, e.g. PC; 300 or 2400 bauds. The module
contains a 3-pole terminal strip with terminals marked 62 (Dat), 63
(Req) and 64 (GND). The used communication protocol is M-Bus.
The coloured wires are to be connected as shown:
9.4 RS485 Communication module
The RS485 communication module is a serial interface for commu-
nication with external devices, e.g. PC; 2400 bauds only. The used
communication protocol is M-Bus.
The module contains a 4-pole terminal strip with terminals marked
D+, D-, +12 V and GND. The module needs an external power supply
of 12 VDC ±5 V.
62 = brown
63 = white
64 = green
Danfoss District Energy
VI.SH.L1.02
DEN-SMT/PL
7
