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b) Operating principle
The ‘FS20 STR’ wireless thermostat measures the current room temperature at its installation position and compares it to the target temperature (set either by time program or manually).
The difference is used to calculate how the FS20 switching units (the ‘FS20 ST-2’ wireless switch socket, for example) need to be switched on or off to achieve the desired temperature.
The time program can be set to meet your individual needs, for example to switch between two different temperatures according to the use of the room (day and night temperatures).
The reversible operating mode means that heating or cooling (or also ventilating) appliances can be controlled.
A safety function ensures the appliance cannot continue to operate uncontrolled in case of a wireless thermostat malfunction or radio connection failure. The consumer is switched off 8 minutes after the last radio transmitted wireless protocol is received.
c) FS20 address system
The radio transmission is secured by an extensive coding system to allow multiple FS20 components (which also includes the ‘FS20 STR’ wireless thermostat and the ‘FS20 ST-2’ wireless switch socket) to be operated simultaneously.
The code consists of a ‘house code’ and an ‘address’. The house code serves to differentiate between multiple FS20 systems operating simultaneously. This means that your neighbour can use the same wireless control system and the two systems will not interfere with each other
(provided that the house code has been programmed differently).
The house code consists of 8 base-four digits (1,2,3,4) meaning that in total 4
8
(= 65536) different house codes are possible. This makes it extremely unlikely that your neighbour will use the same house code (assuming that you do not use ‘simple’ house codes).
The second part of the code is the so-called ‘address’. Every address is a four-digit number made up of the following 16 numbers: 11, 12, 13, 14, 21, 22, 23, 24, 31, 32, 33, 34, 41, 42, 43,
44
Example: Address 11 22
11
12
This means that there are a total of 256 different addresses (16x16 = 256). The addresses are divided into four address types (available number is in brackets):
• Single addresses (225)
• Function group addresses (15)
• Local master addresses (15)
• Global master address (1)
Each address consists of two parts. Part 1 is the ‘address group’, part 2 is the ‘subaddress’.
Example: Address 11 22 = address group ‘11’, subaddress ‘22’
The number ‘44’ has a special meaning. See the following table.
Address group Subadress
Single address
Function group address
Local master address
Global master address
44
44
44
44
44
44
44
44
44 = This value must be set to ‘44’.
44 = This value must not be set to ‘44’.
Possible values are:
11, 12, 13, 14, 21, 22, 23, 24, 31, 32, 33, 34, 41, 42, 43
Every receiver can be assigned one address from each of the four address types (single address, function group address, local master address, global master address). This means that each receiver can respond to up to four different addresses, but only ever to one address per address type.
If you need a receiver to respond to more than one transmitter, you can program the transmitters to the same address or, if different transmitter address types have been set, you can program the receiver consecutively to these different addresses.
The individual address types have the following function:
• Single addresses
Each receiver should be set to a single address so that it can be controlled separately.
• Function group addresses
Several receivers are defined as a functional unit by being assigned to a function group address. If, for example, all the lamps in a house are assigned to a function group, then all the lamps in the entire house can be switched on or off by pressing one button.
• Local master addresses
Several receivers are spatially defined as one unit and controlled via the local master address. If, for example, all the receivers in a room are each allocated to a local master address, then all you need to do is press one button when leaving the room to switch off all the consumer loads in the room.
• Global master address
Several receivers are assigned to the global master address and are jointly controlled via this address. All the consumer loads can easily be switched off simply by pressing one single button when leaving a house, for example.
13
14
The figure below illustrates a possible configuration of different FS20 components in a house:
Global master address
4444
Local master address, e.g. 1144
1211
House code, e.g.
1234 1234
Function group 44xx, e.g. 4411 ceiling lamps
A
1111
1144
4411
4444
1131
1144
4444
1122
1144
4444
1412
4444
1411
4411
4444
D
B
1212
4411
4444
1311
4411
4444
C
Figure 1
When you require a large, extended system, it is advisable to select addresses systematically so that you have an overview of the addresses that have already been assigned and so that you can jointly control the programmed receivers simply and logically in groups.
If you plan to use a number of different FS20 components, draw a diagram of the rooms and make a note of the location of the devices to be controlled and their addresses in the diagram.
In the example, each room has been assigned its own address group (room A: 11, room B: 12, room C: 13, room D: 14). The awning is also allocated to room B with address group 12.
15 address groups are possible:
11, 12, 13, 14, 21, 22, 23, 24, 31, 32, 33, 34, 41, 42, 43
This value must not be set to ‘44’.
In order to be able to separately control each receiver, you need to program each one to a single address. In addition to the address group that is already selected (room A: 11, room B:
12, room C: 13, room D: 14), a subaddress is also needed.
The following 15 subaddresses are possible for each address group:
11, 12, 13, 14, 21, 22, 23, 24, 31, 32, 33, 34, 41, 42, 43
This value must not be set to ‘44’.
In the example the awning is programmed to the single address 1211, which is comprised of the address group 12 and the subaddress 11.
All the receivers in room A have also been programmed to a local master address (1144 in the example).
For the local master address 44 must always be used as the subaddress. The address group can be set to 11, 12, 13, 14, 21, 22, 23, 24, 31, 32, 33, 34, 41,
42, or 43.
Example: 1144, address group 11, subaddress 44
All the lamps in the house can be controlled via the global master address 4444.
The awning was deliberately not programmed to this address and can therefore only be addressed via its single address (1211). It must be operated separately in this example.
The ceiling lamps in all the rooms are also combined in a function group (4411 in the example, address group 44, subaddress 11) and can therefore be jointly controlled.
For a function group 44 must always be used as the address group. The subaddress can be set to 11, 12, 13, 14, 21, 22, 23, 24, 31, 32, 33, 34, 41, 42, or 43.
Example: 4411, address group 44, subaddress 11
15
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