RS485 (MAX489) Biasing
Biasing RS485 networks is a subject that is really not specific to the interface part that you are using. Also keep in mind whilst the interface uses two signalling wires it is essential that you also interconnect devices with an GND wire as well. 

You can find all kinds of information online regarding RS485 but there is an online eBook published by B&amp;B Electronics that you may want to take a detailed look through. In it you will find a wealth of information regarding interfacing biasing and terminations. The following picture borrowed from the eBook on page 38 shows the type of basing you would use in a network where terminations are used.