Bus button coupler FTS61BTK for 4 conventional buttons for connection to button gateways FTS14TG via a 2-wire button bus. Standby loss only 0.2 watts. For flush mounting. 45mm long, 45mm wide, 18mm deep. Up to 30 bus buttons and/or bus button couplers FTS61BTK can be connected to the BP and BN terminals of a button gateway FTS14TG. The permissible total cable length is 200m. The RLC element included with the FTS14TG must also be connected to the BP and BN terminals of the bus button or bus button coupler that is furthest away. The 2-wire button bus supplies the connected FTS61BTK with 29V DC and simultaneously transmits data. Please only use standard bus or telephone lines. With a maximum cable length of 2 meters, up to four conventional buttons can be connected to T1, T2, T3, and T4. The opposite pole is terminal T0. Attention! Do not apply any voltage. The pairs T1/T3 and T2/T4 can be defined as direction buttons. The bus is connected to BP and BN. Observe polarity!