Brian,
I used the Max485.  I've been told that there are other brands that are better, but I haven't had a failure yet.  The network I designed is for controlling several satellite receivers and an audio switcher 3 miles away from a radio studio.  It works pretty good.
The first device in the system is an RS232 to RS485 converter with RS485 addressing implemented.  It runs on a PIC16c74a.  I decided not to even use the serial port within the chip, instead I ran it at 20MHz and bitbanged in and out at 9600 baud.  The other devices are LCD display devices and button panels with LED's on them.  All of these devices are scattered throughout a radio broaccast facility.
The next versions of the converters will use the Max 3110 and Max 3140 (if Digikey will ever carry them)!
Jason
> Jason,
>
> Which RS485 chips did you use?  I am designing a small RS485 Pic Network.
>
> Brian
>
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