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SN65HVD78: Termination resistor and connecting more than one slave devices with the transceiver

Part Number: SN65HVD78

Hello, I am using above mentioned parts to convert TTL /cmos logic to rs 485 and i am wondering if i need a termination resistors and what value ( typically its 60 ohm on each side). Other question I have is: I have 2 slave devices one is connecting to transceiver ( ti part) directly and i have rs 485 to usb converter to connect transceiver to computer. I have also attached a block diagram . can you tell me if the system i have it setup is correct or no? thank you