Eltako – The System in the Building – Operating manual for Series 14 RS485 bus DIN rail mounted devices
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FTS14TG pushbutton gateway and pushbutton bus coupler and bus switch
Operating principle:
Use the FTS14TG pushbutton gateway to enter command signals to the RS485 bus from a separate 2-wire bus connected to an
pushbutton bus coupler and a bus switch. The gateway generates the same telegram structure as wireless building pushbuttons.
Therefore commands can be taught-in directly into Series 14 actuators.
A maximum of 30 bus users can be connected to a pushbutton gateway FTS14TG. The maximum possible is 3 pushbutton gate-
ways FTS14TG with a total of 90 bus devices. An existing bus topology can use used to generate up to 120 command signals in
each line. Feedbacks over the same bus can be displayed by the bus pushbutton with integrated LEDs or by bus pushbutton coupler
FTS61BTKL. Data transfer and power supply between bus modules and the gateway are routed over only 2 conductors.
The bus coupler has a maximum line length of 2 metres and up to four conventional pushbuttons/switches can be connected to
terminals T1 - T4. The pairs T1/T3 and T2/T4 can be defined as direction pushbuttons. The opposite pole in each case is T0. On
the FTS14BTKL the pushbuttons are connected to the four connecting lines T1-T4 and the common blue T0. The associated LEDs
are connected to the four yellow connecting lines and the common blue GND.
The permitted total line length of the 2-wire bus is 200m. The RLC device enclosed with the FTS14TG must be connected to the ter-
minals BP and BN on the furthest bus pushbutton or bus pushbutton coupler.
Connections:
Connect the bus to BP and BN. Make sure the polarity is correct!
Please use only conventional bus or telephone lines.
Do not apply an external control voltage.
The bus communication (regulation of the bus access, against collision) will only work correctly if this connections are done. Only
the first FTS14TG pushbutton gateway requires an additional connection to the Enable terminal. A power supply of 230V is required
to generate the internal 29V DC bus voltage at L and N. It is electrically isolated from the RS485 bus.
8. FTS14TG pushbutton gateway and pushbutton bus coupler or
bus switch
Function rotary switches
Standard setting ex works.
Pushbutton gateway FTS14TG
Bus pushbutton
coupler FTS61BTK
Bus pushbutton coupler
FTS61BTKL
Bus pushbutton
B4T65/B4FT65
Apply no voltage
