Bus pushbutton coupler FTS61BTK for 4 conventional pushbuttons for connection to FTS14TG pushbutton gateways by 2-wire pushbutton bus. Only 0.2 watt standby loss. For installation. 45mm long, 45mm wide, 18mm deep. Up to 30 bus pushbuttons and/or bus pushbutton couplers FTS61BTK devices can be connected to the BP and BN terminals of a pushbutton gateway FTS14TG. The permitted total line length is 200m. The RLC device enclosed with the FTS14TG must also be connected to the terminals BP and BN on the bus switch or pushbutton bus coupler furthest away. A voltage of 29V DC is supplied to the connected FTS61BTK over a 2-wire pushbutton bus which is also used for data transfer. Please use only conventional bus or telephone lines. Up to four conventional pushbuttons can be connected to T1, T2, T3 and T4 by a maximum line length of 2 metres. Connect the opposite pole to the T0 terminal in each case. Caution: Do not apply any voltage. The pairs T1/T3 and T2/T4 can be defined as direction pushbuttons. Connect the bus to BP and BN. Make sure the polarity is correct.