Thanks, Chris. stty does indeed seem to help out with the serial settings.
Now, I've found out that my MAX485 chip is actually half duplex, and I didn't know that, but I guess I should have. The MAX488 chip is apparently full duplex, and I should have gotten that instead. So, I have to set a pair of pins to HIGH right before transmitting the command over RS-485, and then setting it to LOW immediately after, so that I can receive a response. HIGH is TX-mode and LOW is RX-mode
I ran out of time to get it working today, but I plan to make some more time during the next few days.