How to install a Sx2WEB system
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1.2.5 How to define the number of Dupline® networks
The smart-house system is based on a new protocol over the Dupline® bus that is called
SmartDupline®.
Smart Dupline® implements a master-slave protocol running over standard Dupline® networks.
The concept of SmartDupline® is based on the SIN: it is a Specific Identification Number that is unique
for each Dupline® module produced and it is written into the module during the production process and
cannot be modified.
The SIN code is printed on the product label by applying this format:
SIN: 255.255.255
It contains information about the type of the Dupline®
module (light switches, pir, I/O modules, …), the
firmware release and much more.
SmartDupline® enriches the previous protocol with these features:
1) By means of the Specific Identification Number the Master can program the network address ADD
(1..250) in each device.
2) By means of the network address the Master can program the Dupline® standard channel
addresses and all the other module parameters.
3) By means of the network address the Master can access all input and output module information.
4) In a single message frame it is possible to manage double word information.
5) A CRC control is implemented in request and reply frames. Should an error occur, the bus
generator resends the request until it receives a correct frame.
Analogue data is transmitted via the SmartDupline® protocol without using digital I/O channels.
To calculate the number of SH2MCG24 required, the following points have to be taken into
consideration:
1) Each SH2MCG24 can drive up to 250 Dupline® modules (as explained above, it can assign
network addresses from 1 to 250).
2) Each SH2MCG24 can manage up to 112 output signals (e.g. output relays, LED
s, dimmer,…)
3) Each SH2MCG24 can manage up to
120 input signals (light switches, digital input,…)
4) Since most of the Dupline® slave modules are powered by the bus, the SH2MCG24 provides it
with a maximum output current of 450mA (at temperature 30°C), the lower is the current the
higher is the life time of all the system.
The installer will have to calculate the sum of the required modules and their consumption in terms of
current and input/output signals: when one of the four limits mentioned above is surpassed, a new
Dupline® network (i.e. a new SH2MCG24) has to be added.
We suggest designing the Dupline® networks in the best possible way by dividing them according to
specific areas (for example floors) and not to use the bus at its maximum load in order to have space
for further expansion and to prolong its life.
