Danfoss HDU-SF Service Manual page 9

Service Guide
Installation of modules
1. Open the integrator by releasing the side catches.
2. Engage the module in the relevant slot and carefully connect the pre-
formed ribbon cable at both ends.
3. Close the lid and check the meter for correct operation by pressing the
push button.
Communication modules (upon order)
The meter supports two communication channels over the same or different interfaces. An additional 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.
M-Bus
The M-Bus communication module is a serial interface for communication
with external M-Bus control centre. The module contains a 2-pole terminal
strip with terminals marked 24, 25, which are connected to M-Bus control
centre.
M-Bus protocol to EN 1434-3 standard:
▪ Connection for 2 x 2.5 mm² wires
▪ The connection is electrically isolated
▪ Current drawn: one M-Bus load
L-Bus
The L-Bus module is an adapter for an external radio module. Packet length can be configured, conforms to EN1434-3. Data reading
and parametrization are carried out using two-wire scheme with different polarity.
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 6 ... 25 s (variable, depending on protocol length)
▪ The radio module always accesses the current meter registers
▪ Transmission frequency: 868 MHz or 434 MHz
▪ Various Hydrometer receivers are available for receiving the protocol (e.g. Bluetooth, GPRS, LAN, ...)
▪ The protocol corresponds to the Open Metering or HYD standard and is encrypted
▪ Reading modes: walk-by, drive-by, fixed network
RS232 communication module
The RS232 communication module is a serial interface for communication
with external devices, e.g. PC.
The module contains a 3-pole terminal strip with terminals marked 62(Dat),
63(Req) and 64(GND). A special adapter cable is required for connection
(order no. 087H0121). The coloured wires are to be connected as shown:
▪ 62 = brown
▪ 63 = white
▪ 64 = green
Danfoss Heating Solutions
HDU-SF (Horizontal Distribution Units - Single Flat)
VIIGB102
Slot 1
Slot 2
Test Output
Attention!
Keep free at
radio version!
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