How do I set it to TTL mode? The manual says to put jumpers on the TTL pins, but there are no TTL pins to put jumpers on.

I'm trying to get my LCD0821 to display text sent to it via Serial connection from an Arduino UNO R3, with an Ethernet shield. However, there seems to be a problem with the ASCII encoding, or the baud, or both, because the screen displays gibberish similar to a few other peoples' on this forum, and ...