Eltako – The System in the Building – Operating manual for Series 14 RS485 bus DIN rail mounted devices
14
Remote switch system FTS14
Functional principle:
The input modules FTS14EM each with 10 inputs inject control signals into the RS485 bus.
The control inputs can be activated either for pushbuttons (factory settings), window / door contacts or motion detectors.
- for pushbuttons (as-delivered state): Turn the lower rotary switch within 3 seconds 5 times to left stop and back; the LED lights
up for 2 seconds.
- for window contacts: Turn the upper rotary switch within 3 seconds 5 times to left stop and back; the LED lights up for 4 seconds.
- for motion detectors: Turn the upper rotary switch within 3 seconds 5 times to right stop and back; the LED lights up for
6 seconds.
They generate exactly the same telegram structure as wireless building sensors and can therefore be taught-in directly in actuators of
the Series 14.
From production week 21/19 the signals of the control inputs can be inverted.
Invert the signals of the control inputs:
Turn the lower rotary switch 5x to the right-hand stop within 3 seconds, the LED lights up for 2 seconds. By the activation of the
control inputs for pushbuttons, window-door contacts or motion detectors, the inversion is canceled.
Connections:
All HOLD terminals from the devices on the bus must be connected together. The bus communication (regulation of the bus access,
against collision) will only work correctly if this connections are done.
In addition connect the ENABLE terminal of every tenth input module to the connected HOLD terminals.
When the HOLD wire is also routed across several levels as well as RSA/RSB, the GND wire must also be routed in all cases. It is
urgently required to use a screened telecommunication wire, or even better a CAT7 cable.
Due to the floating universal control voltage of 8 to 230V UC, the sensors (contacts) can either be connected directly to the mains
voltage or supplied with low voltage (recommended 24V DC). Then a separate switch mode power supply unit SNT12/24V must
be used.
All input terminals (E1 to E10) are arranged in the lower terminal blocks and a terminal for the common pushbutton reference
potential (-E) is located on the upper terminal block.
The FTS14EM devices can be configured by 2 rotary switches so that up to 50 devices with up to 500 contacts, e.g. pushbuttons,
switches etc. can be connected in a bus installation. The telegram of each pushbutton input in the entire bus is available over the
bus system simultaneously for all actuators connected. It is therefore possible to install central and group pushbuttons rapidly by
using few wires. The related pushbuttons are simply taught-in in the required actuators on the bus.
Recommendations for hook-up on the control side: A hook-up wire, e.g. J-Y(ST)Y 10x2x0.8mm², is recommended for cost reasons and
because it is easy to route. The cross-section of 0.6 mm² is not suitable because it is not sufficiently held by the device terminals.
7. Remote sensing system FTS14
Function rotary switches
Standard setting ex works.
Control inputs FTS14EM
